2022/12/08 更新

写真a

ウメズ シンジロウ
梅津 信二郎
Scopus 論文情報  
論文数: 0  Citation: 0  h-index: 16

Citation Countは当該年に発表した論文の被引用数

所属
理工学術院 創造理工学部
職名
教授
プロフィール
2001年 9月 早稲田大学 理工学部 機械工学科 客員研究助手
2002年 4月 早稲田大学 理工学部 機械工学科 助手
2006年 3月 博士(工学)取得(早稲田大学)
2007年 4月 独立行政法人 理化学研究所 基幹研究所 基礎科学特別研究員
2009年 4月 東海大学 工学部 機械工学科 助教
2012年 4月 東海大学 工学部 機械工学科 講師
2014年 4月 早稲田大学 創造理工学部 総合機械工学科 准教授
2019年 4月 早稲田大学 創造理工学部 総合機械工学科 教授

他学部・他研究科等兼任情報

  • 理工学術院   大学院創造理工学研究科

学内研究所・附属機関兼任歴

  • 2020年
    -
    2022年

    理工学術院総合研究所   兼任研究員

学歴

  • 2003年04月
    -
    2006年03月

    早稲田大学 理工学研究科 機械工学専攻 博士後期課程  

  • 2001年04月
    -
    2003年03月

    早稲田大学 理工学研究科 機械工学専攻 博士前期課程  

  • 1997年04月
    -
    2001年03月

    早稲田大学 理工学部 機械工学科  

学位

  • 早稲田大学   博士(工学)

所属学協会

  •  
     
     

    精密工学会

  •  
     
     

    日本機械学会

 

研究分野

  • 機械力学、メカトロニクス

  • ロボティクス、知能機械システム

研究キーワード

  • マイクロ加工、知能機械、マイクロ・ナノバイオエンジニアリング、バイオICT、太陽電池

研究シーズ

論文

  • Electro-spray deposited TiO<inf>2</inf> bilayer films and their recyclable photocatalytic self-cleaning strategy

    Kewei Song, Yue Cui, Liang Liu, Boyang Chen, Kayo Hirose, Md Shahiduzzaman, Shinjiro Umezu

    Scientific Reports   12 ( 1 )  2022年12月

     概要を見る

    Recyclable titanium dioxide (TiO2)-based photocatalytic self-cleaning films (SCFs) having a bilayer structure were prepared and assessed. These SCFs comprised two layers of fibers fabricated using an electrospinning process. The self-cleaning layer was made of acrylonitrile–butadiene–styrene (ABS) fibers with embedded TiO2 while the substrate layer was composed of fibers made by simultaneously electrospinning poly (vinyl alcohol) (PVA) and ABS. This substrate improved the mechanical strength of the SCF and provided greater adhesion due to the presence of the PVA. The experimental results showed that the hydrophobicity (as assessed by the water contact angle), photocatalytic properties and self-cleaning efficiency of the SCF were all enhanced with increasing TiO2 content in the ABS/TiO2 fibers. In addition, the introduction of the substrate layer allowed the SCFs to be applied to various surfaces and then peeled off when desired. The ABS fibers effectively improved the strength of the overall film, while deterioration of the ABS upon exposure to UV light was alleviated by the addition of TiO2. These SCFs can potentially be recycled after use in various environments, and therefore have applications in the fields of environmental protection and medical science.

    DOI PubMed

    Scopus

    1
    被引用数
    (Scopus)
  • Smart Face Mask Based on an Ultrathin Pressure Sensor for Wireless Monitoring of Breath Conditions

    Junwen Zhong, Zhaoyang Li, Masahito Takakuwa, Daishi Inoue, Daisuke Hashizume, Zhi Jiang, Yujun Shi, Lexiang Ou, Md Osman Goni Nayeem, Shinjiro Umezu, Kenjiro Fukuda, Takao Someya

    Advanced Materials   34 ( 6 )  2022年02月

     概要を見る

    A smart face mask that can conveniently monitor breath information is beneficial for maintaining personal health and preventing the spread of diseases. However, some challenges still need to be addressed before such devices can be of practical use. One key challenge is to develop a pressure sensor that is easily triggered by low pressure and has excellent stability as well as electrical and mechanical properties. In this study, a wireless smart face mask is designed by integrating an ultrathin self-powered pressure sensor and a compact readout circuit with a normal face mask. The pressure sensor is the thinnest (totally compressed thickness of ≈5.5 µm) and lightest (total weight of ≈4.5 mg) electrostatic pressure sensor capable of achieving a peak open-circuit voltage of up to ≈10 V when stimulated by airflow, which endows the sensor with the advantage of readout circuit miniaturization and makes the breath-monitoring system portable and wearable. To demonstrate the capabilities of the smart face mask, it is used to wirelessly measure and analyze the various breath conditions of multiple testers.

    DOI PubMed

    Scopus

    21
    被引用数
    (Scopus)
  • Cell-Based Microfluidic Device Utilizing Cell Sheet Technology

    Katsuhisa Sakaguchi, Kei Akimoto, Masanori Takaira, Ryu-ichiro Tanaka, Tatsuya Shimizu, Shinjiro Umezu

    Cyborg and Bionic Systems   2022   1 - 8  2022年01月

     概要を見る

    The development of microelectromechanical systems has resulted in the rapid development of polydimethylpolysiloxane (PDMS) microfluidic devices for drug screening models. Various cell functions, such as the response of endothelial cells to fluids, have been elucidated using microfluidic devices. Additionally, organ-on-a-chip systems that include organs that are important for biological circulation, such as the heart, liver, pancreas, kidneys, and brain, have been developed. These organs realize the biological circulation system in a manner that cannot be reproduced by artificial organs; however, the flow channels between the organs are often artificially created by PDMS. In this study, we developed a microfluidic device consisting only of cells, by combining cell sheet technology with microtitanium wires. Microwires were placed between stacked fibroblast cell sheets, and the cell sheets adhered to each other, after which the microwires were removed leaving a luminal structure with a size approximately equal to the arteriolar size. The lumen structure was constructed using wires with diameters of 50, 100, 150, and 200 <italic>μ</italic>m, which were approximations of the arteriole diameters. Furthermore, using a perfusion device, we successfully perfused the luminal structure created inside the cell sheets. The results revealed that a culture solution can be supplied to a cell sheet with a very high cell density. The biofabrication technology proposed in this study can contribute to the development of organ-on-a-chip systems.

    DOI

  • 3D-printed swab with cover for precision diagnosis

    Fan Huang, Kewei Song, Yue Jiang, Kayo Hirose, Shinjiro Umezu

    Journal of Materials Science: Materials in Medicine   33 ( 1 )  2022年01月

     概要を見る

    The collection capacity of common nasopharyngeal swabs and irregularities of medical personnel limit the accuracy of PCR testing. This study describes a newly designed 3D-printed swab that is combined with a 3D-printed cover to prevent the extraction of undesired nasal secretions. This swab improved the accuracy of PCR test results. The results of a series of experiments showed that, because of the mucus extraction effect, 3D-printed swabs can replace ordinary cotton swabs. The crisis of the worldwide medical supply shortage can be ameliorated to a certain extent by applying 3D printing technology. [Figure not available: see fulltext.]

    DOI PubMed

    Scopus

  • Direct gold bonding for flexible integrated electronics

    Masahito Takakuwa, Kenjiro Fukuda, Tomoyuki Yokota, Daishi Inoue, Daisuke Hashizume, Shinjiro Umezu, Takao Someya

    Science Advances   7 ( 52 )  2021年12月

     概要を見る

    Flexible and stable interconnections are critical for the next generation of shape-conformable and wearable electronics. These interconnections should have metal-like conductivity and sufficiently low stiffness that does not compromise the flexibility of the device; moreover, they must be achieved using low-temperature processes to prevent device damage. However, conventional interconnection bonding methods require additional adhesive layers, making it challenging to achieve these characteristics simultaneously. Here, we develop and characterize water vapor plasma-assisted bonding (WVPAB) that enables direct bonding of gold electrodes deposited on ultrathin polymer films. WVPAB bonds rough gold electrodes at room temperature and atmospheric pressure in ambient air. Hydroxyl groups generated by the plasma assist bonding between two gold surfaces, allowing the formation of a strong and stable interface. The applicability of WVPAB-mediated connections to ultrathin electronic systems was also demonstrated, and ultraflexible organic photovoltaics and light-emitting diodes fabricated on separate films were successfully interconnected via ultrathin wiring films.

    DOI PubMed

    Scopus

    3
    被引用数
    (Scopus)
  • Low-temperature treated anatase TiO2 nanophotonic-structured contact design for efficient triple-cation perovskite solar cells

    Md. Shahiduzzaman, Mohammad Ismail Hossain, Shuji Otani, LiangLe Wang, Shinjiro Umezu, Tetsuya Kaneko, Satoru Iwamori, Koji Tomita, Yuen Hong Tsang, Md. Akhtaruzzaman, Dietmar Knipp, Jean-Michel Nunzi, Masao Isomura, Juan Antonio Zapien, Tetsuya Taima

    Chemical Engineering Journal   426   131831 - 131831  2021年12月

    DOI

    Scopus

    14
    被引用数
    (Scopus)
  • Paste Aging Spontaneously Tunes TiO<inf>2</inf>Nanoparticles into Reproducible Electrosprayed Photoelectrodes

    Md Shahiduzzaman, Boyang Chen, Md Akhtaruzzaman, Liangle Wang, Hiroki Fukuhara, Koji Tomita, Satoru Iwamori, Jean Michel Nunzi, Tetsuya Taima, Shinjiro Umezu

    ACS Applied Materials and Interfaces   13 ( 45 ) 53758 - 53766  2021年11月

     概要を見る

    In this study, the spontaneous microstructure tuning of TiO2 was observed by aging the ethanol/water TiO2 paste for up to 20 days at ambient conditions. A dynamic light scattering study reveals that it formed the outstanding reproducible TiO2 microstructure with a ∼200 nm average particle size and stabilizes in 6 to 20 days under an ambient atmosphere. Interestingly, the as-deposited day 15 sample spontaneously changed its crystallinity upon keeping the paste at ambient conditions; meanwhile the day 0 sample showed an amorphous structure. A dense, uniform, and stable TiO2 electrode was cast on a fluorine doped-tin oxide substrate using the electrospray technique. We exploit the spontaneous evolution of the TiO2 nanopowder to revisit the fabrication procedure of the TiO2 photoelectrode for dye-sensitized solar cells (DSSCs). The controlled microstructure TiO2 film was used in DSSCs, which, to the best of our knowledge, achieved the highest power conversion efficiency of 9.65% using N719 dye in sensitizing the TiO2 photoanode.

    DOI PubMed

    Scopus

    1
    被引用数
    (Scopus)
  • Simultaneous measurement of contractile force and field potential of dynamically beating human iPS cell-derived cardiac cell sheet-tissue with flexible electronics

    Takashi Ohya, Haruki Ohtomo, Tetsutaro Kikuchi, Daisuke Sasaki, Yohei Kawamura, Katsuhisa Matsuura, Tatsuya Shimizu, Kenjiro Fukuda, Takao Someya, Shinjiro Umezu

    Lab on a Chip   21 ( 20 ) 3899 - 3909  2021年10月

     概要を見る

    Human induced pluripotent stem (iPS) cell-derived cardiomyocytes are used forin vitropharmacological and pathological studies worldwide. In particular, the functional assessment of cardiac tissues created from iPS cell-derived cardiomyocytes is expected to provide precise prediction of drug effects and thus streamline the process of drug development. However, the current format of electrophysiological and contractile assessment of cardiomyocytes on a rigid substrate is not appropriate for cardiac tissues that beat dynamically. Here, we show a novel simultaneous measurement system for contractile force and extracellular field potential of iPS cell-derived cardiac cell sheet-tissues using 500 nm-thick flexible electronic sheets. It was confirmed that the developed system is applicable for pharmacological studies and assessments of excitation-contraction coupling-related parameters, such as the electro-mechanical window. Our results indicate that flexible electronics with cardiac tissue engineering provide an advanced platform for drug development. This system will contribute to gaining new insight in pharmacological study of human cardiac function.

    DOI PubMed

    Scopus

    4
    被引用数
    (Scopus)
  • Photoactive layer formation in the dark for high performance of air-processable organic photovoltaics

    Akihiro Maeda, Ruiyuan Liu, Kilho Yu, Shinyoung Lee, Kyohei Nakano, Masahito Takakuwa, Shipei Zhang, Keisuke Tajima, Kenjiro Fukuda, Shinjiro Umezu, Takao Someya

    Journal of Physics: Materials   4 ( 4 ) 044016 - 044016  2021年10月

    DOI

    Scopus

    2
    被引用数
    (Scopus)
  • An organic transistor matrix for multipoint intracellular action potential recording

    Yasutoshi Jimbo, Daisuke Sasaki, Takashi Ohya, Sunghoon Lee, Wonryung Lee, Faezeh Arab Hassani, Tomoyuki Yokota, Katsuhisa Matsuura, Shinjiro Umezu, Tatsuya Shimizu, Takao Someya

    Proceedings of the National Academy of Sciences of the United States of America   118 ( 39 )  2021年09月

     概要を見る

    Electrode arrays are widely used for multipoint recording of electrophysiological activities, and organic electronics have been utilized to achieve both high performance and biocompatibility. However, extracellular electrode arrays record the field potential instead of the membrane potential itself, resulting in the loss of information and signal amplitude. Although much effort has been dedicated to developing intracellular access methods, their threedimensional structures and advanced protocols prohibited implementation with organic electronics. Here, we show an organic electrochemical transistor (OECT) matrix for the intracellular action potential recording. The driving voltage of sensor matrix simultaneously causes electroporation so that intracellular action potentials are recorded with simple equipment. The amplitude of the recorded peaks was larger than that of an extracellular field potential recording, and it was further enhanced by tuning the driving voltage and geometry of OECTs. The capability of miniaturization and multiplexed recording was demonstrated through a 4 × 4 action potential mapping using a matrix of 5- × 5-μm2 OECTs. Those features are realized using a mild fabrication process and a simple circuit without limiting the potential applications of functional organic electronics.

    DOI PubMed

    Scopus

    4
    被引用数
    (Scopus)
  • New cost effective design of PCR heating cycler system using Peltier plate without the conventional heating block

    Gamal A. Nasser, Ahmed L. Abdel-Mawgood, A. A. Abouelsoud, Hisham Mohamed, Shinjiro Umezu, Ahmed M.R.Fath El-Bab

    Journal of Mechanical Science and Technology   35 ( 7 ) 3259 - 3268  2021年07月

     概要を見る

    Temperature control is a critical factor in PCR for efficient DNA amplification. The main aim is to achieve tight control and high rate of heating and cooling for a portable, cost-effective PCR device. This speed depends on reduction of the thermal mass of the PCR heating part. The common methods used to decrease the device's thermal mass or heating/cooling time are to improve desirable device structural design and to choose a better heating and cooling mechanism with robust controller. Increasing the thermal mass provides a good temperature distribution on the heater surface, but it delays the heat transfer. Therefore, removing thermal mass makes the controller struggle to provide a high temperature uniformity distribution on Peltier surface. In this paper, we provide a cost-effective PCR heating/cooling system using Peltier element. This system is controlled using adaptive FLC with bang-bang as a hybrid controller to provide good accuracy with maximum available temperature changing rate. The results show that in cooling, the adaptive FLC with bang-bang controller is faster by 20 % than the normal PD-like FLC, however in heating it is faster by 5 to 10 %. The adaptive FLC provided steady state error 3 % and 1.5 % less than the normal FLC at denaturation and annealing steps, respectively. Temperature distribution is tested using thermal camera. The device is validated by performing conventional PCR. The amplification product was analyzed by electrophoresis on a 1.5 % agarose gel then stained with ethidium bromide and the products show successfully amplified.

    DOI

    Scopus

    3
    被引用数
    (Scopus)
  • Remote radio control of insect flight reveals why beetles lift their legs in flight while other insects tightly fold

    Takumi Kosaka, Jia Hui Gan, Le Duc Long, Shinjiro Umezu, Hirotaka Sato

    Bioinspiration and Biomimetics   16 ( 3 )  2021年05月

     概要を見る

    In the research and development of micro air vehicles, understanding and imitating the flight mechanism of insects presents a viable way of progressing forward. While research is being conducted on the flight mechanism of insects such as flies and dragonflies, research on beetles that can carry larger loads is limited. Here, we clarified the beetle midlegs' role in the attenuation and cessation of the wingbeat. We anatomically confirmed the connection between the midlegs and the elytra. We also further clarified which pair of legs are involved in the wingbeat attenuation mechanism, and lastly demonstrated free-flight control via remote leg muscle stimulation. Observation of multiple landings using a high-speed camera revealed that the wingbeat stopped immediately after their midlegs were lowered. Moreover, the action of lowering the midleg attenuated and often stopped the wingbeat. A miniature remote stimulation device (backpack) mountable on beetles was designed and utilized for the free-flight demonstration. Beetles in free flight were remotely induced into lowering (swing down) each leg pair via electrical stimulation, and they were found to lose significant altitude only when the midlegs were stimulated. Thus, the results of this study revealed that swinging down of the midlegs played a significant role in beetle wingbeat cessation. In the future, our findings on the wingbeat attenuation and cessation mechanism are expected to be helpful in designing bioinspired micro air vehicles.

    DOI PubMed

    Scopus

    3
    被引用数
    (Scopus)
  • Smooth and slipless walking mechanism inspired by the open-close cycle of a beetle claw

    Daiki Shima, Jia Hui Gan, Shinjiro Umezu, Hirotaka Sato

    Bioinspiration and Biomimetics   16 ( 1 )  2021年01月

     概要を見る

    This study investigated the function of the beetle's claw for its smooth and slipless walking and designed an artificial claw open-close cycle mechanism to mimic the beetle's walking. First, the effects of claw opening and closing on beetles' ability to attach to surfaces were examined. A beetle does not have an attachment pad, and only its claws work to grip the ground; its claw opens and closes and attaches with two sharp hooks. With their claws, beetles can smoothly walk, neither slipping on nor having their claws stuck in the surface. How do they perform smooth walking with sharp claws? In this study, we observed that beetles close their claws when they raise and swung their legs forward, while they open their claws when they lowered their legs to the ground. We then conducted non-destructive tests: their claws were forced open or closed. There was a significant difference in the trajectories of forced-closed claws compared to intact claws and forced-open claws. When their claws were forced-closed, this caused slippage in walking. On the other hand, when a claw was forced-open and its rotation was also inhibited, the claw stuck heavily in the surface, and the beetle could not walk. Based on these findings, we designed an artificial claw to open and close in the same cyclic manner as in the case of natural beetles. The performance of the artificial claw was consistent with the conclusions drawn from natural beetles: the locomotive robot with the artificial claw smoothly moved without slippage. Through these observations, non-destructive tests and performance of the bio-inspired artificial claws, this study confirmed the function of the open-close cycle of beetle claws and demonstrated and successfully adopted it for a locomotive robot.

    DOI PubMed

    Scopus

    6
    被引用数
    (Scopus)
  • Spray Pyrolyzed TiO<inf>2</inf> Embedded Multi-Layer Front Contact Design for High-Efficiency Perovskite Solar Cells

    Md Shahiduzzaman, Mohammad Ismail Hossain, Sem Visal, Tetsuya Kaneko, Wayesh Qarony, Shinjiro Umezu, Koji Tomita, Satoru Iwamori, Dietmar Knipp, Yuen Hong Tsang, Md Akhtaruzzaman, Jean Michel Nunzi, Tetsuya Taima, Masao Isomura

    Nano-Micro Letters   13 ( 1 )  2021年01月

     概要を見る

    The photovoltaic performance of perovskite solar cells (PSCs) can be improved by utilizing efficient front contact. However, it has always been a significant challenge for fabricating high-quality, scalable, controllable, and cost-effective front contact. This study proposes a realistic multi-layer front contact design to realize efficient single-junction PSCs and perovskite/perovskite tandem solar cells (TSCs). As a critical part of the front contact, we prepared a highly compact titanium oxide (TiO2) film by industrially viable Spray Pyrolysis Deposition (SPD), which acts as a potential electron transport layer (ETL) for the fabrication of PSCs. Optimization and reproducibility of the TiO2 ETL were discreetly investigated while fabricating a set of planar PSCs. As the front contact has a significant influence on the optoelectronic properties of PSCs, hence, we investigated the optics and electrical effects of PSCs by three-dimensional (3D) finite-difference time-domain (FDTD) and finite element method (FEM) rigorous simulations. The investigation allows us to compare experimental results with the outcome from simulations. Furthermore, an optimized single-junction PSC is designed to enhance the energy conversion efficiency (ECE) by > 30% compared to the planar reference PSC. Finally, the study has been progressed to the realization of all-perovskite TSC that can reach the ECE, exceeding 30%. Detailed guidance for the completion of high-performance PSCs is provided.[Figure not available: see fulltext.]

    DOI

    Scopus

    28
    被引用数
    (Scopus)
  • Best of both worlds: A novel, environment-friendly approach to 3D printing metal–plastic hybrid structures

    Shinjiro Umezu, Hirotaka Sato

    Reinforced Plastics   65 ( 1 ) 53 - 55  2021年01月

    DOI

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    1
    被引用数
    (Scopus)
  • Metal-plastic hybrid 3D printing using catalyst-loaded filament and electroless plating

    Jing Zhan, Takayuki Tamura, Xiaotong Li, Zhenghao Ma, Michinari Sone, Masahiro Yoshino, Shinjiro Umezu, Hirotaka Sato

    ADDITIVE MANUFACTURING   36  2020年12月

     概要を見る

    The metallization of local areas of 3D-printed plastic structures has attracted a significant amount of attention. However, metal and plastic additive manufacturing technologies are incompatible with each other due to the significant difference in their associated process temperatures. This paper proposes and demonstrates a plastic 3D printing technology that adopts electroless plating, a form of chemical metal deposition. The technology is capable of metalizing selected areas of 3D-printed plastic structures made of acrylonitrile butadiene styrene (ABS). Because electroless plating is triggered by a palladium (Pd) catalyst, this study designed and customfabricated an ABS filament that contains palladium chloride (PdCl2) as a catalyst precursor, which can be used in a fused filament fabrication (FFF) 3D printer. The 3D printer has two nozzles. One produces the main component of the ABS 3D structure using a regular filament (i.e., pure ABS without PdCl2), and the other deposits a PdCl2 -loaded ABS layer onto a selected area of interest using the custom filament. Then, the 3D-printed structure is directly immersed in a nickel (Ni) electroless plating bath. The Ni coats the selected area with strong adhesion. The proposed plastic 3D printing technology coupled with electroless plating does not require any etching (which often uses chromic acid, a very toxic chemical) or roughening of the ABS structure, which are necessary for conventional electroless plating on plastic structures for strong adhesion. Overall, the proposed 3D printing technology has several advantages, namely area-selective metallization, compatibility with regular FFF 3D printing, no damage to the printed structure, and environmental friendliness.

    DOI

    Scopus

    11
    被引用数
    (Scopus)
  • PD-L1/L2 protein levels rapidly increase on monocytes via trogocytosis from tumor cells in classical Hodgkin lymphoma

    Masaharu Kawashima, Joaquim Carreras, Hiroshi Higuchi, Ryutaro Kotaki, Takahiro Hoshina, Kazuki Okuyama, Naoto Suzuki, Masatoshi Kakizaki, Yuji Miyatake, Kiyoshi Ando, Masafumi Nakayama, Shinjiro Umezu, Ryouichi Horie, Yuriko Higuchi, Koko Katagiri, Susumu Goyama, Toshio Kitamura, Kenji Chamoto, Shingo Yano, Naoya Nakamura, Ai Kotani

    Leukemia   34 ( 9 ) 2405 - 2417  2020年09月

     概要を見る

    In classical Hodgkin lymphoma (cHL)—characterized by the presence of Hodgkin and Reed-Sternberg (HRS) cells—tumor-associated macrophages (TAMs) play a pivotal role in tumor formation. However, the significance of direct contact between HRS cells and TAMs has not been elucidated. HRS cells and TAMs are known to express PD-L1, which leads to PD-1+ CD4+ T cell exhaustion in cHL. Here, we found that PD-L1/L2 expression was elevated in monocytes co-cultured with HRS cells within 1 h, but not in monocytes cultured with supernatants of HRS cells. Immunofluorescence analysis of PD-L1/L2 revealed that their upregulation resulted in membrane transfer called “trogocytosis” from HRS cells to monocytes. PD-L1/L2 upregulation was not observed in monocytes co-cultured with PD-L1/L2-deficient HRS cells, validating the hypothesis that there is a direct transfer of PD-L1/L2 from HRS cells to monocytes. In the patients, both ligands (PD-L1/L2) were upregulated in TAMs in contact with HRS cells, but not in TAMs distant from HRS cells, suggesting that trogocytosis occurs in cHL patients. Taken together, trogocytosis may be one of the mechanisms that induces rapid upregulation of PD-L1/L2 in monocytes to evade antitumor immunity through the suppression of T cells as mediated by MHC antigen presentation.

    DOI PubMed

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    19
    被引用数
    (Scopus)
  • Groove fabrication on surface of soft gelatin gel utilizing micro-electrical discharge machining (Micro-EDM)

    Takayuki Tamura, Ryotaro Akiyama, Ryu-ichiro Tanaka, Hiroyuki Kawamoto, Shinjiro Umezu

    JOURNAL OF FOOD ENGINEERING   277  2020年07月

     概要を見る

    This paper reports the utilization of micro-electrical discharge machining (EDM) to process gelatin gel, which is a soft food material. The influence of the applied voltage and selected electrodes on the processed shape was investigated. In addition, using safflower oil in the process can produce narrow grooves. The results showed that micro-EDM with safflower oil can produce micro-grooves (width equal to 2 mu m), and alphabet characters can be engraved into gummy candy and jelly, which are foods containing gelatin. These findings are indicating a potentially powerful tool to produce impressive appearance by fabricating micro texture on gelatin foods.

    DOI

    Scopus

    6
    被引用数
    (Scopus)
  • Paper-Based Electrochemical Sensors Using Paper as a Scaffold to Create Porous Carbon Nanotube Electrodes

    Christopher J. Valentine, Kensuke Takagishi, Shinjiro Umezu, Ronan Daly, Michael De Volder

    ACS APPLIED MATERIALS & INTERFACES   12 ( 27 ) 30680 - 30685  2020年07月

     概要を見る

    Paper-based sensors and assays have evolved rapidly due to the conversion of paper-based microfluidics, functional paper coatings, and new electrical and optical readout techniques. Nanomaterials have gained substantial attraction as key components in paper-based sensors, as they can be coated or printed relatively easily on paper to locally control the device functionality. Here, we report a new combination of methods to fabricate carbon nanotube-based (CNT) electrodes for paper-based electrochemical sensors using a combination of laser cutting, drop-casting, and origami. We applied this process to a range of filter papers with different porosities and used their differences in three-dimensional cellulose networks to study the influence of the cellulose scaffold on the final CNT network and the resulting electrochemical detection of glucose. We found that an optimal porosity exists, which balances the benefits of surface enhancement and electrical connectivity within the cellulose scaffold of the paper-based device and demonstrates a cost-effective process for the fabrication of device arrays.

    DOI PubMed

    Scopus

    24
    被引用数
    (Scopus)
  • An Efficient Ultra-Flexible Photo-Charging System Integrating Organic Photovoltaics and Supercapacitors

    Ruiyuan Liu, Masahito Takakuwa, Ailong Li, Daishi Inoue, Daisuke Hashizume, Kilho Yu, Shinjiro Umezu, Kenjiro Fukuda, Takao Someya

    Advanced Energy Materials   10 ( 20 )  2020年05月

     概要を見る

    Flexible and biocompatible integrated photo-charging devices consisting of photovoltaic cells and energy storage units can provide an independent power supply for next-generation wearable electronics or biomedical devices. However, current flexible integrated devices exhibit low total energy conversion and storage efficiency and large device thickness, hindering their applicability towards efficient and stable self-powered systems. Here, a highly efficient and ultra-thin photo-charging device with a total efficiency approaching 6% and a thickness below 50 µm is reported, prepared by integrating 3-µm-thick organic photovoltaics on 40 µm-thick carbon nanotube/polymer-based supercapacitors. This flexible photo-charging capacitor delivers much higher performance compared with previous reports by tuning the electrochemical properties of the composite electrodes, which reduce the device thickness to 1/8 while improving the total efficiency by 15%. The devices also exhibit a superior operational stability (over 96% efficiency retention after 100 charge/discharge cycles for one week) and mechanical robustness (94.66% efficiency retention after 5000 times bending at a radius of around 2 mm), providing a high-power and long-term operational energy source for flexible and wearable electronics.

    DOI

    Scopus

    33
    被引用数
    (Scopus)
  • Printing support hydrogels for creating vascular-like structures in stacked cell sheets

    Ryu-ichiro Tanaka, Katsuhisa Sakaguchi, Shinjiro Umezu

    ARTIFICIAL LIFE AND ROBOTICS   25 ( 2 ) 199 - 203  2020年05月

     概要を見る

    Vascular structures are essential for the survival of thick artificial three-dimensional (3D) tissues. However, it is difficult to create high-cell-density artificial tissue with vascular structures of a few hundred micrometers in diameter. Bioprinting technology can create artificial 3D tissues with vascular structures of a few hundred micrometers in diameter, but the cell density of bio-printed artificial 3D tissues is low. On the other hand, cell sheet technology can create high-cell-density artificial 3D tissues by stacking, but it is not possible to set small vascular structures at any place. In this study, we successfully demonstrated high-cell-density artificial 3D tissues with vascular-like structures by stacking cell sheets combined with bioprinting technology.

    DOI

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    2
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  • A high quality surface finish grinding process to produce total reflection mirror for x-ray fluorescence analysis

    Hitoshi Ohmori, Shinjiro Umezu, Yunji Kim, Yoshihiro Uehara, Hiroshi Kasuga, Teruko Kato, Nobuhide Itoh, Syuhei Kurokawa, Takayuki Kusumi, Yugo Sugawara, Shinsuke Kunimura

    International Journal of Extreme Manufacturing   2 ( 1 )  2020年03月

     概要を見る

    Total reflection x-ray fluorescence analysis is applied to trace element detection in liquid for effective environmental monitoring. This analytical approach requires x-ray total reflection mirrors. In order to achieve high sensitivity element detection, the mirrors require high surface quality for high x-ray reflectivity. Surface finishing for x-ray mirrors is typically conducted through a series of abrasive processes, such as grinding and polishing, and is thus time consuming. The purpose of this study is to streamline and enhance the surface finishing process based on unique high quality grinding techniques for the production of x-ray total reflection mirrors.

    DOI

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    7
    被引用数
    (Scopus)
  • Nanograting Structured Ultrathin Substrate for Ultraflexible Organic Photovoltaics

    Masahito Takakuwa, Soo Won Heo, Kenjiro Fukuda, Keisuke Tajima, Sungiun Park, Shinjiro Umezu, Takao Someya

    SMALL METHODS   4 ( 3 )  2020年03月

     概要を見る

    The nanopatterning of the surfaces of polymer substrates enhances the performances of photovoltaics. Ultraflexible organic photovoltaics (OPVs) are one of the promising energy harvesters for wearable electronics. A reduction in incident light angle dependence while maintaining the power conversion efficiency (PCE) is desirable for wearable electronics devices in which the angle of incident light continuously changes due to the deformation of the device. However, the nanopatterning of the ultrathin polymer substrates of ultraflexible OPVs using the reported methods is challenging because they fatally damage the substrates. Here, the fabrication of ultraflexible OPVs having a low incident light angle dependence while maintaining a PCE of 10.5% by developing ultrathin nanograting polymer substrates is reported. The nanograting-patterned fluorinated polymer enables the formation of periodic nanograting structures onto the back surface of a 1 mu m thick polymer substrate having a pitch of 760 nm and a height of 100 nm, while the opposite surface remains flat after the formation of the planarization layer. Furthermore, with the nanopatterning of the ultrathin substrate, electron-transporting layer, and active layer, the ultraflexible OPVs exhibit a PCE of 10.8%. The combination of new materials with the developed patterning method is expected to afford even greater performances.

    DOI

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    16
    被引用数
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  • Single-Phase Brookite TiO2 Nanoparticle Bridge Enhances the Stability of Perovskite Solar Cells

    Md Shahiduzzaman, Ashish Kulkarni, Sem Visal, LiangLe Wang, Masahiro Nakano, Makoto Karakawa, Kohshin Takahashi, Shinjiro Umezu, Atsushi Masuda, Satoru Iwamori, Masao Isomura, Tsutomu Miyasaka, Koji Tomita, Tetsuya Taima

    Sustainable Energy & Fuels   4 ( 10.1039/C9SE01133A ) 2009 - 2017  2020年02月  [査読有り]

     概要を見る

    Titanium dioxide (TiO2) based planar perovskite solar cells (PSCs) suffer from poor long-term stability and show hysteretic behaviour in the device characteristic curve. In addition to the exceptional bulk properties of the perovskite, the performance and stability are also highly dependent on the conduction band energy, conductivity, and electronic trap states of the TiO2 compact layer (CL). In this work, single-phase brookite (BK) TiO2 nanoparticles (NPs), synthesized via a hydrothermal method using a water-soluble titanium complex, are incorporated as a bridge between the perovskite and TiO2 CL. This resulted in uniform large perovskite grain growth with enhanced crystallinity, significant reduction in trap/defect sites and interfacial recombination as revealed by scanning electron microscopy (SEM), photoluminescence (PL), and impedance spectroscopy results, respectively. The resulting PSCs show highly reproducible power conversion efficiencies (PCEs) up to ∼18.2% (vs. ∼15%) with a stable performance of 18% under continuous light illumination (1 sun) at the maximum power point tracking (MPPT) in contrast to only TiO2 CL based planar devices. To the best of our knowledge, this is so far the best photo-stability data reported for brookite NP based PSCs. Based on our present study, at the end we provide further direction to enhance the stability of planar PSCs.

    DOI

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    21
    被引用数
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  • Oblique Electrostatic Inkjet- Deposited TiO2 Electron Transport Layers for Efficient Planar Perovskite Solar Cells

    Md Shahiduzzaman, Toshiharu Sakuma, Tetsuya Kaneko, Koji Tomita, Masao Isomura, Tetsuya Taima, Shinjiro Umezu, Satoru Iwamori

    Scientific Reports   9 ( 19494 )  2019年12月  [査読有り]

     概要を見る

    In this study, a new, simple, and novel oblique electrostatic inkjet (OEI) technique is developed to deposit a titanium oxide (TiO2) compact layer (CL) on fluorine-doped tin oxide (FTO) substrate without the need for a vacuum environment for the first time. The TiO2 is used as electron transport layers (ETL) in planar perovskite solar cells (PSCs). This bottom-up OEI technique enables the control of the surface morphology and thickness of the TiO2 CL by simply manipulating the coating time. The OEI-fabricated TiO2 is characterized tested and the results are compared with that of TiO2 CLs produced by spin-coating and spray pyrolysis. The OEI-deposited TiO2 CL exhibits satisfactory surface coverage and smooth morphology, conducive for the ETLs in PSCs. The power-conversion efficiencies of PSCs with OEI-deposited TiO2 CL as the ETL were as high as 13.19%. Therefore, the present study provides an important advance in the effort to develop simple, low-cost, and easily scaled-up techniques. OEI may be a new candidate for depositing TiO2 CL ETLs for highly efficient planar PSCs, thus potentially contributing to future mass production.

    DOI PubMed

    Scopus

    17
    被引用数
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  • Flying cyborg: A new approach for the study of coleoptera's flight pitching

    Yao Li, Ying Hu, Shinjiro Umezu, Hirotaka Sato

    2019 IEEE International Conference on Cyborg and Bionic Systems, CBS 2019     159 - 164  2019年09月

     概要を見る

    The study of flight orientation has gained more and more attention. In this study, we demonstrated a cyborg beetle for measuring body orientations in free flight, which contained a living insect platform and a miniature backpack with micro battery. While flying in a large flight chamber, the flight status of cyborg beetle could be recorded remotely. Thereafter, the effect of pitching on flight control was analyzed. According to the recorded flight data, a strong linear relationship was revealed between the pitch angles and forward accelerations, which was quantified by the Pearson's correlation coefficients and the fitting of mean forward accelerations under each pitch angle. We believe the coupling of pitch angle and forward acceleration is generated by tilted net aerodynamic force and flight air drag. The achievement of the orientation analysis would inspire a new approach to control system design of flying cyborgs and flapping-wing micro air vehicles (MAVs).

    DOI

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  • Development of insect cyborgs with artificial wings

    Takumi Kosaka, Takahiro Shimizu, Hirotaka Sato, Shinjiro Umezu

    2019 IEEE International Conference on Cyborg and Bionic Systems, CBS 2019     216 - 221  2019年09月

     概要を見る

    Research on the flight ability of insects has been drawing a lot of attention over the years. In this study, we investigated the effects of wing structure of insects on their flight performances by excising beetle wing membranes and replacing them with artificial ones. We measured the difference in the flight performance between intact and artificial wings which parylene thin film is replaced to natural membrane of wing with a six-axis force system and motion capture using the VICON software. The measured parameters include thrust, lift, acceleration, and deceleration. Membrane-excised beetles that were classified to be unable to fly or not flyable succeeded in flying after artificial membranes were added in place of the excised wings. The success of this repair has the potential to lead to the development of novel ways of enhancing flight performance through the evolution of artificial wing.

    DOI

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    1
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  • New thermal protection system using high-temperature carbon fibre-reinforced plastic sandwich panel

    Yuki Kubota, Ousei Miyamoto, Takuya Aoki, Yuichi Ishida, Toshio Ogasawara, Shinjiro Umezu

    Acta Astronautica   160   519 - 526  2019年07月  [査読有り]

     概要を見る

    © 2019 IAA Herein, a new lightweight thermal protection system was proposed to reduce the weight of a re-entry capsule. The proposed system employs an ablator as a thermal protection material, and a high-temperature polyimide carbon fibre-reinforced plastic (CFRP) sandwich panel as a structure member. The sandwich panel was designed to exhibit high thermal insulation and good mechanical properties at high temperature, and simultaneously ensure that the ablator has low thickness. Three-point bending was carried out at a high temperature up to 300 °C to evaluate shear strength and flexural rigidity of the sandwich panel. Further, the proposed thermal protection system was examined using an arc-heated plasma wind tunnel to evaluate its thermal protection performance and thermal response. The shear strength and the flexural rigidity of this high-temperature structure were 76.8 and 86.9% of that at room temperature, respectively, when evaluated at 300 °C. The proposed system achieved more than 40% weight reduction while maintaining high thermal insulation and recession resistance.

    DOI

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    26
    被引用数
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  • High Operation Stability of Ultraflexible Organic Solar Cells with Ultraviolet-Filtering Substrates

    Kimura Hiroki, Fukuda Kenjiro, Jinno Hiroaki, Park Sungjun, Saito Masahiko, Osaka Itaru, Takimiya Kazuo, Umezu Shinjiro, Someya Takao

    ADVANCED MATERIALS   31 ( 19 )  2019年05月  [査読有り]

    DOI PubMed

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    32
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  • Low-Temperature-Processed Brookite-Based TiO2 Heterophase Junction Enhances Performance of Planar Perovskite Solar Cells.

    Md Shahiduzzaman, Sem Visal, Mizuki Kuniyoshi, Tetsuya Kaneko, Shinjiro Umezu, Tetsuhiro Katsumata, Satoru Iwamori, Masato Kakihana, Tetsuya Taima, Masao Isomura, Koji Tomita

    Nano letters   19 ( 1 ) 598 - 604  2019年01月  [査読有り]  [国際誌]

     概要を見る

    In the design of electron-transport layers (ETLs) to enhance the efficiency of planar perovskite solar cells (PSCs), facile electron extraction and transport are important features. Here, we consider the effects of different titanium oxide (TiO2) polymorphs, anatase and brookite. We design and fabricate high-phase-purity, single-crystalline, highly conductive, and low-temperature (<180 °C)-processed brookite-based TiO2 heterophase junctions on fluorine-doped tin oxide (FTO) as the substrate. We test and compare single-phase anatase (A) and brookite (B) and heterophase anatase-brookite (AB) and brookite-anatase (BA) as ETLs in PSCs. The power-conversion efficiencies (PCEs) of PSCs with low-temperature-processed single-layer FTO-B as the ETL were as high as 14.92%, which is the highest reported efficiency of FTO-B-based single-layer PSC. This implies that FTO-B serves as an active phase and can be a potential candidate as an n-type ETL scaffold in planar PSCs. Moreover, the surface of highly crystalline brookite TiO2 exhibits a tendency toward interparticle necking, leading to the formation of compact scaffolds. Furthermore, PSCs with heterophase junction FTO-AB ETLs exhibited PCEs as high as 16.82%, which is superior to those of PSCs with single-phase anatase (FTO-A) and brookite (FTO-B) as the ETLs (13.86% and 14.92%, respectively). In addition, the PSCs with FTO-AB exhibited improved efficiency and decreased hysteresis compared with those with FTO-BA (13.45%) due to the suitable band alignment with the perovskite layer, which resulted in superior photogenerated charge-carrier extraction and reduced charge accumulation at the interface between the heterophase junction and perovskite. Thus, the present work presents an effective strategy by which to develop heterophase junction ETLs and manipulate the interfacial energy band to further improve the performance of planar PSCs and enable the clean and eco-friendly fabrication of low-cost mass production.

    DOI PubMed

    Scopus

    43
    被引用数
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  • Attempts on pico-precision machining via combination of ELID-grinding and polishing

    Hitoshi Ohmori, Yunji Kim, Yoshihiro Uehara, Hiroshi Kasuga, Teruko Ono-Kato, Weimin Lin, Syuhei Kurokawa, Shinjiro Umezu

    Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering   85 ( 4 ) 304 - 309  2019年

    DOI

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    1
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  • Durable Ultraflexible Organic Photovoltaics with Novel Metal‐Oxide‐Free Cathode

    Zhi Jiang, Kenjiro Fukuda, Wenchao Huang, Sungjun Park, Roda Nur, Md Osman Goni Nayeem, Kilho Yu, Daishi Inoue, Masahiko Saito, Hiroki Kimura, Tomoyuki Yokota, Shinjiro Umezu, Daisuke Hashizume, Itaru Osaka, Kazuo Takimiya, Takao Someya

    Advanced Functional Materials   29 ( 6 ) 1808378  2018年12月  [査読有り]

    DOI

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    24
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  • Development of a high-precision viscous chocolate printer utilizing electrostatic inkjet printing

    Suzuki, Y, Takagishi, K, Umezu, S

    Journal of Food Process Engineering   42 ( 1 ) e12934  2018年11月  [査読有り]

    DOI

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    5
    被引用数
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  • Ultraflexible Near-Infrared Organic Photodetectors for Conformal Photoplethysmogram Sensors

    Park S, Fukuda K, Wang M, Lee C, Yokota T, Jin H, Jinno H, Kimura H, Zalar P, Matsuhisa N, Umezu S, Bazan G.C, Someya T

    Advanced Materials   30 ( 34 )  2018年08月  [査読有り]

    DOI

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    132
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  • Thermally stable, highly efficient, ultraflexible organic photovoltaics

    Xiaomin Xu, Kenjiro Fukuda, Akchheta Karki, Sungjun Park, Hiroki Kimura, Hiroaki Jinno, Nobuhiro Watanabe, Shuhei Yamamoto, Satoru Shimomura, Daisuke Kitazawa, Tomoyuki Yokota, Shinjiro Umezu, Thuc-Quyen Nguyen, Takao Someya

    Proceedings of the National Academy of Sciences of the United States of America   115 ( 18 ) 4589 - 4594  2018年05月  [査読有り]

     概要を見る

    Flexible photovoltaics with extreme mechanical compliance present appealing possibilities to power Internet of Things (IoT) sensors and wearable electronic devices. Although improvement in thermal stability is essential, simultaneous achievement of high power conversion efficiency (PCE) and thermal stability in flexible organic photovoltaics (OPVs) remains challenging due to the difficulties in maintaining an optimal microstructure of the active layer under thermal stress. The insufficient thermal capability of a plastic substrate and the environmental influences cannot be fully expelled by ultrathin barrier coatings. Here, we have successfully fabricated ultraflexible OPVs with initial efficiencies of up to 10% that can endure temperatures of over 100 °C, maintaining 80% of the initial efficiency under accelerated testing conditions for over 500 hours in air. Particularly, we introduce a low-bandgap poly(benzodithiophene-cothieno[3,4-b]thiophene) (PBDTTT) donor polymer that forms a sturdy microstructure when blended with a fullerene acceptor. We demonstrate a feasible way to adhere ultraflexible OPVs onto textiles through a hot-melt process without causing severe performance degradation.

    DOI PubMed

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    93
    被引用数
    (Scopus)
  • Simple action potential measurement of cardiac cell sheet utilizing electronic sheet

    Takashi Ohya, Kazuki Nakazono, Tetsutaro Kikuchi, Daisuke Sasaki, Katsuhisa Sakaguchi, Tatsuya Shimizu, Kenjiro Fukuda, Takao Someya, Shinjiro Umezu

    Artificial Life and Robotics   23 ( 3 ) 1 - 7  2018年03月  [査読有り]

     概要を見る

    In this study, a device for measuring the action potential of cardiac cell sheets was developed. The action potential was measured using a device comprising a 2-µm-thick parylene film with a silver electrode printed on it, which was referred to as the “electronic sheet.” The thin parylene film exhibits high biocompatibility and flexibility. Therefore, it demonstrates promise for biomedical microelectromechanical system applications. In this study, a cell sheet was used because the interest it had garnered in regenerative medicine for creating cardiac tissue in vitro similar to that in vivo. A high-efficiency drug development system can be realized by combining cell sheet technology and fabricating a flexible electronic sheet. The action potential of a cardiac cell sheet from a rat was measured using the as-developed flexible electronic sheet.

    DOI

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    3
    被引用数
    (Scopus)
  • Highly Efficient Planar Perovskite Solar Cells Exploiting a Compact TiO2/Anatase TiO2 Single Crystalline Nanoparticles Electron Transport Bilayer

    Md. Shahiduzzaman, Hiroto Ashikawa, Mizuki Kuniyoshi, Tetsuya Kaneko, Shinjiro Umezu, Tetsuhiro Katsumata, Satoru Iwamori, Tetsuya Taima, Masato Kakihana, Masao Isomura, Koji Tomita

    2018 IEEE 7TH WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION (WCPEC) (A JOINT CONFERENCE OF 45TH IEEE PVSC, 28TH PVSEC & 34TH EU PVSEC)     0512 - 0517  2018年

     概要を見る

    Herein, a compact TiO2/Anatase (AT) titania nanoparticles (TiO2 NPs) bilayer was introduced as an electron transport layer (ETL) by comprising spray pyrolysis (SP) deposition and spin-coating (SC) technique, respectively, in planar perovskite solar cells. A SP-TiO2/SC-AT TiO2 NPs bilayer-based perovskite solar cells are facilitated more efficient electron transport, charge extraction, and low interfacial recombination, and thus leads champion efficiencies up to 17.05% by a significant decrease of J-V hysteresis, presenting almost 12% enhancement compared to the TiO2 single layer-based counterparts.

  • The high precision drawing method of chocolate utilizing electrostatic ink-jet printer

    Kensuke Takagishi, Yuya Suzuki, Shinjiro Umezu

    JOURNAL OF FOOD ENGINEERING   216   138 - 143  2018年01月  [査読有り]

     概要を見る

    The objective of this study is to develop 3D food printer that can improve taste by means of creating food texture and can grant artistry which pastry chef perform by utilizing electrostatic inkjet printer high precision printing. There is a previous 3D food printer which utilizes Fused Deposition Modeling (FDM) to print chocolate. This method is to melt the material by heat and then print the material layer by layer to shape. It can only represent a rough image of the object since its print precision is rough. Furthermore, the material it can use is limited. Therefore in this study, we utilize electrostatic inkjet printing technology. By utilizing electrostatic inkjet printing, it not only enables high precision printing and grants food artistry but it also optimizes inner structure. High precision food printing is one of the important element to create food texture. We manufactured the electrostatic inkjet chocolate 3D printer and investigated its basic property. Utilized electrostatic inkjet chocolate 3D printer to print chocolate on the edible film and transfer it to a complex free surface. (C) 2017 Elsevier Ltd. All rights reserved.

    DOI

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    11
    被引用数
    (Scopus)
  • Fundamental characteristics of printed gelatin utilizing micro 3D printer

    Ryu-ichiro Tanaka, Katsuhisa Sakaguchi, Shinjiro Umezu

    Artificial Life and Robotics   22 ( 3 ) 316 - 320  2017年09月  [査読有り]

     概要を見る

    Gelatin is useful for biofabrication, because it can be used for cell scaffolds and it has unique properties. Therefore, we attempted to fabricate biodevices of gelatin utilizing micro 3D printer which is able to print with high precision. However, it has been difficult to fabricate 3D structure of gelatin utilizing 3D printer, because a printed gelatin droplet on the metal plate electrode would spread before solidification. To clear this problem, we developed a new experimental set-up with a peltier device that can control temperature of the impact point. At an impact point temperature of 80 °C, the spreading of printed gelatin droplets was prevented. Therefore, we were able to print a ball gelatin. In addition, we were able to print a narrower gelatin line than at an impact point temperature of 20 °C.

    DOI

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    4
    被引用数
    (Scopus)
  • Fabrication of micro-gelatin fiber utilizing coacervation method

    Takafumi Arai, Ryuichiro Tanaka, Katsuhisa Sakaguchi, Shinjiro Umezu

    Artificial Life and Robotics   22 ( 2 ) 197 - 202  2017年06月  [査読有り]

     概要を見る

    Biotechnology has drastically been advanced by the development of iPS and ES cells, which are representative forms induced pluripotent stem cells. In the micro/nano bio field, the development of cells and Taylor-made medicine for a potential treatment of incurable diseases has been a center of attention. The melting point of gelatin is between 25 and 33 °C, and the sol–gel transition occurs in low temperature. This makes the deformation of this useful biomaterial easy. The examples of gelatin fiber applications are suture threads, blood vessel prosthesis, cell-growth-based materials, filter materials, and many others. Because the cell size differs depending on the species and applications, it is essential to fabricate gelatin fibers of different diameters. In this paper, we have developed a fabrication method for gelatin fibers the coacervation method. We fabricated narrow gelatin fibers having a diameter over 10 μm.

    DOI

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    2
    被引用数
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  • Bio-inspired wing-folding mechanism of micro air vehicle (MAV)

    Tomohiro Jitsukawa, Hisaya Adachi, Takamichi Abe, Hiroshi Yamakawa, Shinjiro Umezu

    Artificial Life and Robotics   22 ( 2 ) 203 - 208  2017年06月  [査読有り]

     概要を見る

    Over the past few years, many researchers have shown an interest in micro air vehicle (MAV), since it can be used for rescue mission and investigation of danger zone which is difficult for human being to enter. In recent years, many researchers try to develop high-performance MAVs, but a little attention has been given to the wing-folding mechanism of wings. When the bird and the flying insects land, they usually fold their wings. If they do not fold their wings, their movement area is limited. In this paper, we focused on the artificial wing-folding mechanism. We designed a new artificial wing that has link mechanism. With the wing-folding mechanism, the wing span was reduced to 15%. In addition, we set feathers separately on the end of wings like those of real birds. The wings make thrust force by the change of the shape of the feathers. However, the wings could not produce enough lift force to lift it. Therefore, we have come to the conclusion that it is necessary to optimize the wings design to get stronger lift force by flapping.

    DOI

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    11
    被引用数
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  • Fabrication of micro-alginate gel tubes utilizing micro-gelatin fibers

    Katsuhisa Sakaguchi, Takafumi Arai, Tatsuya Shimizu, Shinjiro Umezu

    JAPANESE JOURNAL OF APPLIED PHYSICS   56 ( 5 )  2017年05月  [査読有り]

     概要を見る

    Tissues engineered utilizing biofabrication techniques have recently been the focus of much attention, because these bioengineered tissues have great potential to improve the quality of life of patients with various hard-to-treat diseases. Most tissues contain micro-tubular structures including blood vessels, lymphatic vessels, and bile canaliculus. Therefore, we bioengineered a micro diameter tube using alginate gel to coat the core gelatin gel. Micro-gelatin fibers were fabricated by the coacervation method and then coated with a very thin alginate gel layer by dipping. A micro diameter alginate tube was produced by dissolving the core gelatin gel. Consequently, these procedures led to the formation of micro-alginate gel tubes of various shapes and sizes. This biofabrication technique should contribute to tissue engineering research fields. (C) 2017 The Japan Society of Applied Physics

    DOI

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    1
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  • 化学溶解仕上げによる 3D プリンタ造形物の高強度化

    高岸 賢輔, 梅津 信二郎

    IIP情報・知能・精密機器部門講演会講演論文集   2017   PH - 5  2017年

     概要を見る

    When the 3D printed structures were printed utilizing FDM 3D printer the layer grooves were generated on the structures. The layer grooves make the 3D printed structures strength decrease. Therefore authors already devised the 3D-CMF (Chemical Melting Finishing). The 3D-CMF is the method that dissolve the convex part of the layer grooves and filled in the concave part of the layer grooves and smoothen the layer grooves.3D-CMF reduces the cause of breaking of the 3D printed structures, which is considered to increase the strength. In this paper, we investigated the fundamental characteristics of the 3D-CMF and demonstrate of the change of the strength of the 3D printed structures.

    DOI CiNii

  • Thermal response and recession resistance of new thermal protection system using high-temperature CFRP sandwich panel

    Ousei Miyamoto, Yuki Kubota, Takuya Aoki, Yuichi Ishida, Toshio Ogasawara, Shinjiro Umezu

    Proceedings of the International Astronautical Congress, IAC   12   7941 - 7947  2017年  [査読有り]

     概要を見る

    Copyright © (2017) by International Astronautical Federation. All rights reserved. Our research target is to develop new light weight Thermal Protection System applying for space vehicles, such as re-entry capsule. This system consists of ablation material and high-temperature structure material. A concept of the new system was a substitution an existing structure material with high-temperature CFRP sandwich panel so that an ablator showing thermal protection is thinner. The flexural strength and rigidity of the high-temperature sandwich panel was evaluated at elevated temperature. These properties were maintained up to 300°C. Applied ablator was also developed in this study. This ablator showed higher recession resistance than existing one. The developed system showed 51% of weight reduction and improving 48% of recession resistance. Consequently, the developed system exhibited high potential as a new concept of thermal protection.

  • Development of the Improving Process for the 3D Printed Structure

    Kensuke Takagishi, Shinjiro Umezu

    SCIENTIFIC REPORTS   7   39852  2017年01月  [査読有り]

     概要を見る

    The authors focus on the Fused Deposition Modeling (FDM) 3D printer because the FDM 3D printer can print the utility resin material. It can print with low cost and therefore it is the most suitable for home 3D printer. The FDM 3D printer has the problem that it produces layer grooves on the surface of the 3D printed structure. Therefore the authors developed the 3D-Chemical Melting Finishing (3D-CMF) for removing layer grooves. In this method, a pen-style device is filled with a chemical able to dissolve the materials used for building 3D printed structures. By controlling the behavior of this pen-style device, the convex parts of layer grooves on the surface of the 3D printed structure are dissolved, which, in turn, fills the concave parts. In this study it proves the superiority of the 3D-CMF than conventional processing for the 3D printed structure. It proves utilizing the evaluation of the safety, selectively and stability. It confirms the improving of the 3D-CMF and it is confirmed utilizing the data of the surface roughness precision and the observation of the internal state and the evaluation of the mechanical characteristics.

    DOI PubMed

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    50
    被引用数
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  • Flow control for cell growth by movement of magnetic particles utilizing electromagnetic force

    Shinjiro Umezu

    Artificial Life and Robotics   21 ( 1 ) 1 - 4  2016年03月  [査読有り]

     概要を見る

    Three-dimensional (3D) cell structures are required to fabricate artificial organ. Inkjet technology is applied for fabrication of 3D cell structures in order to fabricate artificial organ and investigate biochemical characteristics of cells in 3D cell structures. Usually cells located inside 3D cell structures get nutrition via blood vessels. In case that there are no blood vessels in the 3D cell structures, cells located inside the 3D cell structures will die of nutrition shortage. So, blood vessels are essential to fabricate 3D cell structures. When the amount and flow of nutrition is controlled, growth speed of cells will be changed. We control the flow around the cells utilizing magnetic particles and magnetic force. The magnetic particles are installed in the dish that is filled with medium, nutrition and living cells. When the magnetic particles are trapped and transported by magnetic force, the cell growth will be controlled. In this paper, we challenge to control the flow utilizing magnetic particles and magnetic force.

    DOI

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  • 空洞を有するバイオデバイス作製のためのマイクロゼラチンファイバーの作製

    田中 龍一郎, 新井 隆史, 上原 嘉宏, 坂口 勝久, 梅津 信二郎

    生体医工学   54 ( 27 ) S165 - S165  2016年

     概要を見る

    <p>Gelatin has unique properties. The form is changed by temperature. In addition, the melting point is around 37 degree C. For these reasons, gelatin is useful for biofabrication. We are able to fabricate biodevices of biomaterials with cave utilizing gelatin. In this study, we spun gelatin fibers utilizing three methods. We were able to fabricate micro gelatin fibers which diameter was 20~200 μm. Each methods have merits and demerits. Therefore, utilizing three methods, we were able to fabricate complex structures of micro gelatin fibers.</p>

    DOI CiNii

  • Spray-coated Pt counter electrode of dye-sensitized solar cell utilizing electrostatic inkjet printing

    Shinjiro Umezu, Kyosuke Kosugi, Yoshihito Kunugi, Yuki Shimoyama

    JAPANESE JOURNAL OF APPLIED PHYSICS   53 ( 5 )  2014年05月  [査読有り]

     概要を見る

    Dye-sensitized solar cell (DSC) is highly focused because of low-cost. Generally, DSC was composed of photoelectrode, dye, electrolyte, and counter electrode (CE). Sputter-coated Pt on the fluorine doped tin oxide (FTO) electrode was mainly used as CE, however it was expensive and low speed fabrication. In this study, we tried to apply the spray mode of the electrostatic inkjet printing for fabrication of CE. Fundamental characteristics were investigated with the spray-coated Pt CE, the sputter-coated Pt CE, and FTO CE. Conversion efficiency was very low in case of FTO CE. Efficiency of spray-coated Pt CE was 3.6%. The efficiency was a little lower than that of commonly used sputter-coated Pt CE because Pt was not completely coated on the FTO glass by the inkjet printing. These results indicated that spray-coated Pt on FTO glass had possibility to be used as CE of DSC. (C) 2014 The Japan Society of Applied Physics

    DOI

    Scopus

    5
    被引用数
    (Scopus)
  • Precision printing of gelatin utilizing electrostatic inkjet

    Shinjiro Umezu

    JAPANESE JOURNAL OF APPLIED PHYSICS   53 ( 5 )  2014年05月  [査読有り]

     概要を見る

    The precision printing of biomaterials is essential for fabricating bio devices, and two-dimensional (2D) and three-dimensional (3D) cell structures. To fabricate 3D cell structure artificially, biomaterials should be installed between cells to support the gravity force of cells. In general, the viscosity of ink from biomaterials is relatively high. An electrostatic inkjet is used for the bioprinting of cells and biomaterials because it has good merits, i.e., high printing resolution and good capability to eject highly viscous ink. In this paper, gelatin, an important biomaterial is printed using an electrostatic inkjet. The width of the finest printed line is 6 m. The precisely printed line can be used as a scaffold of living cells. (C) 2014 The Japan Society of Applied Physics

    DOI

    Scopus

    13
    被引用数
    (Scopus)
  • トンボ翅上突起物を模倣した人工翅の作製

    UMEZU Shinjiro, TANAKA Yoshiaki, AZETSU Akihiko, HASHIMOTO Hiromu

    Journal of Advanced Science   26 ( 3 ) 28 - 31  2014年

     概要を見る

    Micro air vehicle (MAV) is highly focused by many researchers because the MAV can investigate the condition of disaster site and accident site that is difficult to investigate for human being. Usually, design of the aircraft wing is inspired by birds and flying insects. Resently, dragonfly is a good research target because the dragonfly has high flight performances and high robustness. In order to develop the MAV that is inspired by the dragonfly, it is important to investigate the aerodynamic characteristics of micro structures on the dragonfly's wing. The cross section of the dragonfly's wing is corrugated. The effect of the corrugated shape is already investigated and applied to windmills for weak wind. On the other hand, the effect of micro spikes on the dragonfly's wing is not investigated in spite that the number of the spikes are more than three thusands. So, we focus on the micro spikes on the wing vein of dragonfly. Firstly, we prepared the handmade artificial wings with micro spikes. The fabricated artificial wing had 150 micro spikes whose length wass 600~700 μm. We investigated the aerodynamic characteristics of the micro spikes on these artificial wings. Some merits of micro spikes were observed in spite that the length and the number of spikes were different from those of the natural wing. So, we challenged to fabricate highly realistic artificial wing and investigate the aerodynamic characteristics of the wing. A metal mold with micro holes was fabricated by the electrical discharge machining (EDM) process. Melted chitosan was applied on the mold and spread into the hole of the mold. After the solidification of chitosan, artificial wing with 400 micro spikes was fabricated. These wings had 400 micro spikes whose height is 100 μm.

    DOI CiNii

  • Characteristics on micro-biofabrication by patterning with electrostatically injected droplet

    Shinjiro Umezu, Hitoshi Ohmori

    CIRP ANNALS-MANUFACTURING TECHNOLOGY   63 ( 1 ) 221 - 224  2014年  [査読有り]

     概要を見る

    Micro biofabrication technologies have been developing aiming to fabricate 3D artificial organs, 3D scaffolds, and complex tissue structures. We are now developing a new inkjet bio-printing method via electrostatic phenomenon. The merits of the new method are of high resolution, and of ability to eject highly viscous liquid and media. In this paper, we attempted to apply the proposed method for precision printing cells and biomaterials. Living cells and scaffolds have successfully been printed and the biochemical characteristics have been investigated. A 3D cell structure which had a cavity to create blood vessels has also successfully fabricated by this method. (C) 2014 CIRP.

    DOI

    Scopus

    13
    被引用数
    (Scopus)
  • Dye-sensitized solar cell utilizing electrostatic inkjet

    Shinjiro Umezu, Yoshihito Kunugi, Hitoshi Ohmori

    Japanese Journal of Applied Physics   52 ( 5 )  2013年05月  [査読有り]

     概要を見る

    Solar cell is one of the key technologies in this century because this has possibility to clear energy problems. We tried to pattern good titania layer of dye-sensitized solar cell (DSC) utilizing electrostatic inkjet. The electrostatic inkjet has good merit
    that is ability to eject highly viscous liquid. We applied the merit for patterning titania paste on fluorine-doped tin oxide (FTO) glass. In this paper, we investigated fundamental characteristics to pattern titania layer on FTO glass because efficiency depends on thickness of titania layer. © 2013 The Japan Society of Applied Physics.

    DOI

    Scopus

    16
    被引用数
    (Scopus)
  • Fundamental Characteristics of Bioprint on Calcium Alginate Gel

    Shinjiro Umezu, Tatsuru Hatta, Hitoshi Ohmori

    JAPANESE JOURNAL OF APPLIED PHYSICS   52 ( 5 )  2013年05月  [査読有り]

     概要を見る

    The goal of this study is to fabricate precision three-dimensional (3D) biodevices those are micro fluidics and artificial organs utilizing digital fabrication. Digital fabrication is fabrication method utilizing inkjet technologies. Electrostatic inkjet is one of the inkjet technologies. The electrostatic inkjet method has following two merits; those are high resolution to print and ability to eject highly viscous liquid. These characteristics are suitable to print biomaterials precisely. We are now applying for bioprint. In this paper, the electrostatic inkjet method is applied for fabrication of 3D biodevices that has cave like blood vessel. When aqueous solution of sodium alginate is printed to aqueous solution of calcium chloride, calcium alginate is produced. 3D biodevices are fabricated in case that calcium alginate is piled. (C) 2013 The Japan Society of Applied Physics

    DOI

    Scopus

    15
    被引用数
    (Scopus)
  • 静電インクジェットを利用した色素増感型太陽電池の新しい色素吸着法

    KAWATA Shigeto, OGAWA Masafumi, UMEZU Shinjiro, KUNUGI Yoshihito, OHMORI Hitoshi

    Journal of Advanced Science   25 ( 3 ) 25 - 30  2013年

     概要を見る

    The Dye-Sensitized Solar Cell (DSC) has been attracting the attention of many researchers due to its good characteristics such as low cost, flexibility, and colorful panel. Normally DSC is produced by dipping a titania- coated FTO electrode in the dye solution for over three hours to adsorb dye onto the titania layer of the DSC. We have been investigating fundamental characteristics of the electrostatic inkjet. Ejected droplets are charged because of high voltage application. Since the dye adsorption process depends on charge, charged dye gives a preferable effect to the adsorption process to shorten the adsorption time. In this study, an experimental set-up of an electrostatic inkjet was constructed to print dye on a titania-coated FTO electrode. We have investigated the fundamental characteristics of the dye-printed DSC by changing the printing time. As a result, the printing time was drastically reduced from several hours to about 14 or 15 minutes, and the efficiency proved to be about 5%, which is a comparable value to that made by ordinary production methods.

    DOI CiNii

  • Fabrication of Dye-sensitized Solar Cells Using Electrostatic Inkjet Printing

    Yoshihito Kunugi, Yuki Shimoyama, Shinjiro Umezu

    JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY   26 ( 3 ) 383 - 385  2013年  [査読有り]

    DOI

    Scopus

    6
    被引用数
    (Scopus)
  • 3 Dimensional Prints (3DP) of Artificial Cell Structures

    Shinjiro Umezu

    NIP29: 29TH INTERNATIONAL CONFERENCE ON DIGITAL PRINTING TECHNOLOGIES / DIGITAL FABRICATION 2013     4 - 4  2013年  [査読有り]

  • Robot Arm Printer of Electrostatic Inkjet

    Kawata Shigeto, Umezu Shinjiro

    NIP29: 29TH INTERNATIONAL CONFERENCE ON DIGITAL PRINTING TECHNOLOGIES / DIGITAL FABRICATION 2013     190 - 193  2013年  [査読有り]

  • Optimization of Titania Thickness of Dye-Sensitized Solar Cell(DSC) Utilizing Patterning with Electrostatically-Injected Droplet (PELID) Method

    Kyousuke Kosugi, Yuki Shimoyama, Shinjiro Umezu, Yoshihito Kunugi, Hitoshi Ohmori

    NIP29: 29TH INTERNATIONAL CONFERENCE ON DIGITAL PRINTING TECHNOLOGIES / DIGITAL FABRICATION 2013     36 - 39  2013年  [査読有り]

     概要を見る

    Solar cell is one of the key technologies in this century because this has possibility to clear energy problems. In this paper, we tried to pattern titania layer of dye-sensitized solar cell (DSC) utilizing PELID method. The PELID method is an inkjet fabrication method. The FEUD method has good merit; that is ability to eject highly viscous liquid. We applied the merit for patterning titania paste on FTO (Fluorine-doped Tin Oxide) glass. The thickness of titania layer was controlled by the time to print. DSC is composed of electrolyte that is sandwiched between FTO glass and Pt electrode. Titania and N3 are patterned on FTO glass. The efficiency is not so high. The main purpose of the study is to improve the efficiency. The fabrication process of the DSC was simple. Titania paste was patterned on FTO glass utilizing doctor blade. The patterned paste was dried and sintered. The thickness of the layer was controlled by the spacer between the doctor blade and the glass. In the former study, the thickness was not changed, however it is essential to determine the thickness to achieve the highest efficiency. Because best thickness will be changed by the chemical characteristics of titania, new fabrication method that can change the thickness easily should be developed. We developed the PELID method.
    In this paper, we have optimized of titania layer by controlling the coating time and profile utilizing FEUD method. We have demonstrated that optimizing titania layer by PELID method is possible to improve the efficiency of the DSC.

  • ロール・ツー・ロールプリンテッドエレクトロニクスにおける基幹技術

    橋本 巨, 梅津 信二郎

    精密工学会誌   78 ( 8 ) 674 - 677  2012年

    DOI CiNii

    Scopus

  • Digital Fabrication of 3D Bio Devices Utilizing PELID (Patterning with Electrostatically-Injected Droplet) Method

    Shinjiro Umezu, Tatsuru Hatta, Hitoshi Ohmori

    NIP28: 28TH INTERNATIONAL CONFERENCE ON DIGITAL PRINTING TECHNOLOGIES / DIGITAL FABRICATION 2012     338 - 340  2012年  [査読有り]

     概要を見る

    In this paper, we fabricated soft 3D bio devices utilizing PELID (Patterning with Electrostatically-Injected Droplet) method. It is preferable to perform laboratory experiments with 3D structures in bioengineering. We have investigated mechanism and fundamental characteristics of the PELID method and now been applying for new printing technology of high image quality and 3D printing technology. The method has two merits, higher resolution than commercial printer and ability to eject with highly viscous liquid. We can eject viscous paste that viscosity is 30000 mPas. At DF 2010, I already presented that cells and scaffolds were printed to fabricate 3D cell structures because scaffolds assisted the weight of cells. Now, we should fabricate 3D structure that has cave because real 3D structure has blood vessel like cave. It is difficult to fabricate 3D structure that has cave. Gelatin is used as sacrificial layer. When the printed 3D structure is put into hot water, gelatin is removed. With this technique, we can print 3D structure that has cave. The tube filled with the liquid that contained gelatin and the tube filled with the liquid that contained calcium alginate was hanged down perpendicular to a dish. Voltage was applied between the syringes and the dish by power supplies (voltage range: -5kV similar to +5kV, Matsusada Precision Inc, Tokyo, HVR10P). The air gap was adjusted by a z-stage and the plate electrode was moved in x and y directions with two linear motors. PC controlled voltage application and motion of linear stages. We fabricated 3D bio devices.

  • BioCell Print Utilizing PELID (Patterning with Electrostatically-Injected Droplet) Method

    Shinjiro Umezu

    PROCEEDINGS OF THE SEVENTEENTH INTERNATIONAL SYMPOSIUM ON ARTIFICIAL LIFE AND ROBOTICS (AROB 17TH '12)     534 - 537  2012年  [査読有り]

     概要を見る

    The object of this study is to fabricate three Dimensional cell structures utilizing PELID (Patterning with ELectrostatically-Injected Droplet) method. Because it is preferable to perform laboratory experiments with 3D cell structures in tissue engineering and artificial organ. However, it is difficult to fabricate 3D cell structures because own weight of cell is above the bonding force between cells. In this paper, we printed MDCK cells and collagen as scaffolds utilizing the PELID method. We investigated growth of printed cells. Number of printed cells was increased day by day. We investigated fundamental characteristics on patterning collagen. The printed collagen was thick when the time to print was increased. These results indicated that it is possible to fabricate 3D cell structure.

  • Fundamental Characteristics on Patterning TiO2 of Dye-Sensitized Solar Cell Utilizing PELID (Patterning with Electrostatically-Injected Droplet) Method

    Shinjiro Umezu, Yoshihito Kunugi, Tatsuya Yukimoto, Arata Fukasawa, Hitoshi Ohmori

    DIGITAL FABRICATION 2011/ NIP27- 27TH INTERNATIONAL CONFERENCE ON DIGITAL PRINTING TECHNOLOGIES: TECHNICAL PROGRAMS AND PROCEEDINGS, 2011     659 - 661  2011年  [査読有り]

     概要を見る

    Solar cell is one of the key technologies in this century because this has possibility to clear energy problems. In this paper, we tried to pattern titania layer of dye-sensitized solar cell (DSC) utilizing FEUD method. The FEUD method is an inkjet fabrication method. The PELID method has good merit; that is ability to eject highly viscous liquid. We applied the merit for patterning titania paste on FTO (Fluorine-doped Tin Oxide) glass. The thickness of titania layer was controlled by the time to print. DSC is composed of electrolyte that is sandwiched between FTO glass and Pt electrode. Titania and N3 are patterned on FTO glass. The efficiency is not so high. The main purpose of the study is to improve the efficiency. The fabrication process of the DSC was simple. Titania paste was patterned on FTO glass utilizing doctor blade. The patterned paste was dried and sintered. The thickness of the layer was controlled by the spacer between the doctor blade and the glass. In the former study, the thickness was not changed, however it is essential to determine the thickness to achieve the highest efficiency. Because best thickness will be changed by the chemical characteristics of titania, new fabrication method that can change the thickness easily should be developed. We developed the FEUD method. When the strong electric field was applied to a nozzle, small droplets were ejected by the electrostatic force.
    In this paper, we applied the PELID method to pattern titania on FTO glass. The thickness of patterned titania layer was investigated.

  • Fundamental Characteristics of Printed Cell Structures Utilizing Micro-Drop Injection

    Shinjiro Umezu, Takashi Kitajima, Hitoshi Ohmori, Yoshihiro Ito

    NIP 25: DIGITAL FABRICATION 2009, TECHNICAL PROGRAM AND PROCEEDINGS     407 - +  2009年  [査読有り]

     概要を見る

    Micro-drop injection took place when high voltage was applied between a capillary tube filled with ion conductive liquid and a metal plate electrode. Micro-drop injection has two merits; those are high resolution to print and ability to eject highly viscous liquid. Recently many researchers applied commercial inkjet for bio-printing. Main problem of this application is difficulty to print relatively highly viscous liquid. I think the merits of micro-drop injection will clear this problem. So, I applied the micro-drop injection for printing living cells and highly viscous scaffolds to make 3D cell structures. Cells were not killed in spite that high voltage was applied by micro-drop injection. Because current did not flow inside cell but around cell. In this paper, we cleared the fundamental characteristics of patterning living cells and gelatin and fabricated 3D cell cylinder utilizing micro-drop injection.

  • New Micro Fabrication Techniques Utilizing Electrostatic Inkjet Phenomena

    Shinjiro Umezu, Kazutoshi Katahira, Hitoshi Ohmori

    NIP24/DIGITAL FABRICATION 2008: 24TH INTERNATIONAL CONFERENCE ON DIGITAL PRINTING TECHNOLOGIES, TECHNICAL PROGRAM AND PROCEEDINGS     287 - 290  2008年  [査読有り]

     概要を見る

    Electrostatic inkjet phenomena took place when strong electric field was applied to water pin electrode. In this paper we developed two new micro fabrication techniques utilizing electrostatic inkjet phenomena. First technique is to thin a metal rod The metal rod was set on a metal plate electrode. The diameter of the rod was controlled by the time of voltage application between the capillary tube and the metal rod The other is to punch a hole in a metal thin sheet. A shin metal sheet was set on the metal plate electrode. When the formation and locus of droplets that contained commercial etching liquid was controlled, small hole was punctured on the shin sheet. Hole diameter, less than 10 mu m to some 100 mu m was controlled by the voltage application between the sheet electrode and the capillary tube that was filled with the etching liquid

  • Electrostatic manipulation of particle

    Hiroyuki Kawamoto, Hiroki Ando, Shinjiro Umezu

    NIP 22: 22ND INTERNATIONAL CONFERENCE ON DIGITAL PRINTING TECHNOLOGIES, FINAL PROGRAM AND PROCEEDINGS     176 - +  2006年  [査読有り]

     概要を見る

    We have been investigating an electrostatic manipulation of a small particle, such as toner and carrier particles. A manipulator consisted of two parallel pin electrodes. When voltage was applied between the electrodes, electrophoresis force generated in nonuniform electrostatic field was applied to the particle near the tip of the electrode. The particle was captured by the application of the voltage and released from the manipulator by turning off the voltage application. It was possible to manipulate not only insulative but also conductive particles. However, if the particle was charged, Coulomb force and adhesion force prevented to release the particle when the voltage was turned off. This condition was apt to take place for small particles, less than 200 fun in diameter. The third electrode was introduced near the dipole electrodes to blow off the particle by the ionic wind and the validity of this system was demonstrated. An uneven electrode system without the additional separation electrode was also developed to release the attached particle independently of the position of the manipulator. Three-dimensional calculation was conducted by the Finite Difference Method and compared to the measured force.

  • Cross-talk of multi-nozzle in electrostatic inkjet system

    Shinjiro Umezu, Ryosuke Nakazawa, Hiroyuki Kawamoto

    NIP 22: 22ND INTERNATIONAL CONFERENCE ON DIGITAL PRINTING TECHNOLOGIES, FINAL PROGRAM AND PROCEEDINGS     66 - +  2006年  [査読有り]

     概要を見る

    We have been developing an electrostatic inkjet system for printers and mask-less electronic micro-circuit printing. The system consisted of a tube filled with ink and a plate electrode. When voltage was applied between the electrodes, a droplet was formed and separated at the tip of the tube periodically. Optimizing this system we have demonstrated 1,600 dpi printing on paper. However the print speed was deadly slow because this system had only single nozzle. Therefore we have been developing a multi-nozzle system that consisted of two parallel tubes filled with ink and the metal plate electrode. Three-dimensional calculation of the electric field was conducted by the Finite Difference Method to deduce the cross-talk between the electrodes and it is proposed that a new system that the waveform of the applied voltage was adjusted to cancel the cross-talk between the adjacent nozzle.

  • Electrohydrodynamic deformation of water surface in a metal pin to water plate corona discharge system

    Hiroyuki Kawamoto, Shinjiro Umezu

    Journal of Physics D: Applied Physics   38 ( 6 ) 887 - 894  2005年03月  [査読有り]

     概要を見る

    Electrohydrodynamic deformation of water surface was investigated in a pin-to-plate gas discharge system that consisted of a pin electrode made of metal and an ion-conductive water electrode. In the condition of a lower applied voltage than the corona threshold, because an extremely small electrostatic attractive force, a Coulomb force in the order of 10 μN, was induced, water lifted up in the order of several tens of micrometres at the centre. Over the threshold voltage corona discharge took place and a relatively large repulsive force, in the order of 100 μN, was induced due to the ionic wind. It depressed water in the order of several hundred micrometres at the centre. Deformation of the water level coincided with the pressure distribution on the metal plate electrode, if the surface tension of water and the Coulomb force was included in the estimation to derive the pressure distribution from the measured deformation of the water level. If the applied voltage was lower than the corona threshold, total force to the water electrode coincided with that to the pin electrode. However, it was larger than that to the pin electrode at the corona discharge because the reaction force due to the ionic wind was applied not only to the pin electrode but also to other parts of the electrode at the corona discharge. © 2005 IOP Publishing Ltd.

    DOI

    Scopus

    51
    被引用数
    (Scopus)

▼全件表示

Misc

  • Airtight, flexible, disposable barrier for extubation

    Kayo Hirose, Kanji Uchida, Shinjiro Umezu

    Journal of Anesthesia   34 ( 5 ) 798 - 799  2020年10月

    速報,短報,研究ノート等(学術雑誌)  

    DOI PubMed

  • 静電インクジェットを用いた機能性TiO2層の作製

    CHEN Boyang, TANG Mingyi, SHAHIDUZZAMAN Md., 冨田恒之, 岩森暁, 梅津信二郎

    日本材料科学会学術講演大会講演予稿集   2020  2020年

    J-GLOBAL

  • 静電インクジェット法を用いた二酸化チタン薄膜の構造制御とペロブスカイト太陽電池への応用

    YUZE Ning, SHAHIDUZZAMAN Md., 冨田恒之, 梅津信二郎, 岩森暁

    日本材料科学会学術講演大会講演予稿集   2020  2020年

    J-GLOBAL

  • 静電インクジェット法を用いた二酸化チタン薄膜の構造制御とペロブスカイト太陽電池への応用

    YUZE Ning, SHAHIDUZZAMAN Md., 冨田恒之, 梅津信二郎, 岩森暁

    日本機械学会関東支部総会・講演会講演論文集(CD-ROM)   26th  2020年

    J-GLOBAL

  • 生体外におけるヒト子宮内膜間質細胞シートの厚みに卵巣ホルモンが与える影響の検討

    藤田真央, 坂口勝久, 藏本吾郎, 梅津信二郎, 清水達也

    日本機械学会関東支部・精密工学会・茨城大学工学部茨城講演会講演論文集(CD-ROM)   28th  2020年

    J-GLOBAL

  • 静電インクジェット法を用いた二酸化チタン薄膜の構造制御とペロブスカイト太陽電池への応用

    NING Yuze, 佐久間駿治, SHAHIDUZZAMAN Md., 冨田恒之, 梅津信二郎, 岩森暁

    日本材料科学会学術講演大会講演予稿集   2019  2019年

    J-GLOBAL

  • 子宮内膜組織構築に向けた灌流培養デバイスの開発・検討

    坂田周平, 坂田周平, 坂口勝久, 坂口勝久, 鈴木崇, 藏元吾朗, 梅津信二郎, 清水達也

    日本再生医療学会総会(Web)   18th  2019年

    J-GLOBAL

  • 立体組織構築のためのバイオプリンタを用いたハイドロゲルのマイクロ加工

    田中龍一郎, 坂口勝久, 清水達也, 梅津信二郎

    日本材料科学会学術講演大会講演予稿集   2019  2019年

    J-GLOBAL

  • 水溶性チタン錯体を用いた有機無機ハイブリッド太陽電池のTiO2電極の作製

    國吉望月, 藤代義正, 安江祥慶, Md. Shahiduzzaman, 勝又 哲裕, 金子 哲也, 磯村 雅夫, 岩森 暁, 梅津信二郎, 小林亮, 垣花眞人, 冨田 恒之

    日本セラミックス協会2018年年会    2018年03月

  • ジェランガムゲルを用いたバイオデバイス開発のためのゲル濃度検討

    田中龍一郎, 坂口勝久, 坂口勝久, 清水達也, 梅津信二郎

    日本材料科学会学術講演大会講演予稿集   2018  2018年

    J-GLOBAL

  • 異なる径の管腔構造を有する生体組織の作製

    秋元渓, 坂口勝久, 坂口勝久, 清水達也, 梅津信二郎

    日本材料科学会学術講演大会講演予稿集   2018  2018年

    J-GLOBAL

  • 静電インクジェット法を用いたユニーク形状を有するジェランガムゲルの作製

    田中龍一郎, 坂口勝久, 清水達也, 梅津信二郎

    日本機械学会関東支部・精密工学会・茨城大学工学部茨城講演会講演論文集(CD-ROM)   26th  2018年

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  • 細胞シート工学とマイクロチタン線を用いた灌流可能な血管様構造を有する立体組織の作製

    秋元渓, 秋元渓, 坂口勝久, 坂口勝久, 清水達也, 梅津信二郎

    日本再生医療学会総会(Web)   17th  2018年

    J-GLOBAL

  • バイオプリンティングにおけるジェランガムのゲル化方法の開発

    田中龍一郎, 坂口勝久, 坂口勝久, 清水達也, 梅津信二郎

    日本再生医療学会総会(Web)   17th  2018年

    J-GLOBAL

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    上本詩織, 梅津信二郎, 原口裕次, 坂口勝久, 清水達也

    日本機械学会関東支部総会・講演会講演論文集(CD-ROM)   24th  2018年

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    上本詩織, 原口裕次, 坂口勝久, 梅津信二郎, 清水達也

    日本機械学会バイオフロンティア講演会講演論文集(CD-ROM)   29th  2018年

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  • 放電加工を用いたゼラチンゲルのマイクロ溝作製における基礎特性

    田村隆行, 田中龍一郎, 梅津信二郎

    日本機械学会関東支部・精密工学会・茨城大学工学部茨城講演会講演論文集(CD-ROM)   25th  2017年

    J-GLOBAL

  • マイクロ3Dフードプリンタの試作と印刷物の評価

    鈴木 祐哉, 高岸 賢輔, 梅津 信二郎

    Imaging Conference Japan論文集     17 - 20  2017年

    CiNii

  • 静電式インクジェット技術を用いた光電極の作製と色素増感型太陽電池への応用

    中村祐稀, 冨田恒之, 梅津信二郎, 岩森暁

    日本材料科学会学術講演大会講演予稿集   2017  2017年

    J-GLOBAL

  • 改良型静電インクジェット装置による色素増感型太陽電池用二酸化チタン膜の作製

    中村祐稀, 冨田恒之, 岩森暁, 梅津信二郎

    日本機械学会情報・知能・精密機器部門講演会論文集(CD-ROM)   2017  2017年

    J-GLOBAL

  • 静電インクジェット法を用いたバイオ用マイクロ3Dプリンター

    梅津信二郎, 田中龍一郎, 坂口勝久, 清水達也

    再生医療   16  2017年

    J-GLOBAL

  • 細胞シート工学とマイクロチタン線を用いた血管様構造を有する立体組織の構築

    秋元渓, 坂口勝久, 坂口勝久, 新井隆史, 新井隆史, 清水達也, 梅津信二郎

    再生医療   16  2017年

    J-GLOBAL

  • 静電インクジェットを用いた高精度なバイオマテリアルのプリント

    田中龍一郎, 田中龍一郎, 坂口勝久, 坂口勝久, 清水達也, 梅津信二郎

    再生医療   16  2017年

    J-GLOBAL

  • バイオマテリアルゲルの高精度パターニング技術の開発

    田中龍一郎, 坂口勝久, 坂口勝久, 清水達也, 清水達也, 梅津信二郎

    Imaging Conference Japan論文集   2017  2017年

    J-GLOBAL

  • マイクロバイオ3Dプリンタを用いたバイオマテリアルゲルパターニング技術の開発

    田中龍一郎, 坂口勝久, 清水達也, 梅津信二郎

    日本生体医工学会大会プログラム・抄録集(Web)   56th  2017年

    J-GLOBAL

  • 細胞シート工学とマイクロチタン線を用いた血管構造を有する立体組織の作製

    秋元渓, 坂口勝久, 清水達也, 梅津信二郎

    日本機械学会関東支部総会・講演会講演論文集(CD-ROM)   23rd  2017年

    J-GLOBAL

  • マイクロバイオ3Dプリンタの開発とバイオマテリアルのパターニング

    田中龍一郎, 坂口勝久, 清水達也, 梅津信二郎

    日本機械学会情報・知能・精密機器部門講演会論文集(CD-ROM)   2017  2017年

    J-GLOBAL

  • 3Dプリンタの市場、応用の可能性 (特集 最新「画像技術」)

    梅津 信二郎, 高岸 賢輔

    OHM = オーム   103 ( 10 ) 32 - 34  2016年10月

    CiNii

  • H-3-4 3Dプリンタ造形物表面改質処理機構の開発(マイクロナノ理工学(3),口頭発表)

    高岸 賢輔, 梅津 信二郎

    IIP情報・知能・精密機器部門講演会講演論文集   2016   "H - 3-4-1"-"H-3-4-4"  2016年03月

     概要を見る

    Grooves were generated on the surface of the molding when 3D structures printed. The grooves were difficult to remove by the abrasive finishing process because the grooves exist inside of the printed structures. When the printed surface was melted and reformed utilizing chemical melting finishing process, the grooves will be disappeared and smooth surface will be appeared. 3D-Chemical Melting Finishing Process can selective surface treatment. In this paper, we investigated the fundamental characteristics of the 3D-Chemical Melting Finishing Process.

    CiNii

  • H-3-5 静電インクジェット法を用いた色素増感型太陽池の二酸化チタ薄膜の構造制御と積層構造の評価(マイクロナノ理工学(3),口頭発表)

    中村 祐稀, 高森 健吾, 水野 真帆, 功刀 義人, 岩森 暁, 梅津 信二郎

    IIP情報・知能・精密機器部門講演会講演論文集   2016   "H - 3-5-1"-"H-3-5-2"  2016年03月

     概要を見る

    Dye-sensitized Solar Cell (DSC) is one of the noteworthy devices due to its superior decoration and low cost process. However, there is a drawback in low conversion efficiency. Therefore we have studied fabrication method of the TiO_2 films for the improvement of the conversion efficiency. In this paper, we report on a method how to improve the conversion efficiency due to optimizing TiO_2 layers using the electrostatic inkjet. It was found that density of the TiO_2 layer is controlled by changing gap length between the two electrode by a scanning electron microscope of the inside and interface of TiO_2 layers. Further, the conversion efficiency of the cell was slightly enhanced by the stack of the two different density layers.

    CiNii

  • 色素増感太陽電池に向けたニードル状アナターゼ型二酸化チタンの高比表面積化

    菊地 貴寛, 冨田 恒之, 関 彩希江, 功刀 義人, 梅津 信二郎, 小林 亮, 垣花 眞人

    日本セラミックス協会2016年年会    2016年03月

  • ナノロッド状粒子を用いた二酸化チタン膜の作製と色素増感型太陽電池への応用

    中村祐稀, 小川真史, 冨田恒之, 梅津信二郎, 岩森暁

    日本機械学会機械材料・材料加工技術講演会論文集(CD-ROM)   24th  2016年

    J-GLOBAL

  • マイクロ3Dプリンタによるゼラチンの3次元造形

    田中龍一郎, 坂口勝久, 坂口勝久, 梅津信二郎

    Imaging Conference Japan論文集   2016  2016年

    J-GLOBAL

  • マイクロ3Dプリンタを用いた着弾面の材料による吐出精度の変化

    田中龍一郎, 坂口勝久, 坂口勝久, 清水達也, 清水達也, 梅津信二郎

    Meeting of Federation of Imaging Societies (CD-ROM)   3rd  2016年

    J-GLOBAL

  • PTFE材を用いたマイクロゼラチンファイバーの型成形

    田中龍一郎, 上原嘉宏, 坂口勝久, 梅津信二郎

    日本機械学会情報・知能・精密機器部門講演会論文集(CD-ROM)   2016  2016年

    J-GLOBAL

  • バイオマテリアルをコートしたチタン細線における細胞接着・成長特性

    秋元渓, 坂口勝久, 清水達也, 梅津信二郎

    日本機械学会機械材料・材料加工技術講演会論文集(CD-ROM)   24th  2016年

    J-GLOBAL

  • インク保温機能を搭載したマイクロ3Dプリンタによるゼラチン水溶液の吐出特性

    田中龍一郎, 坂口勝久, 清水達也, 梅津信二郎

    日本機械学会機械材料・材料加工技術講演会論文集(CD-ROM)   24th  2016年

    J-GLOBAL

  • マイクロアルギン酸ゲルチューブ作製時のゼラチン溶解特性

    新井隆史, 坂口勝久, 清水達也, 梅津信二郎

    日本機械学会機械材料・材料加工技術講演会論文集(CD-ROM)   24th  2016年

    J-GLOBAL

  • ニードル状TiO2の形態制御と色素増感太陽電池への応用

    菊地貴寛, 冨田 恒之, 関彩希江, 功刀 義人, 梅津信二郎, 垣花眞人

    日本化学会秋季事業 第5回CSJ化学フェスタ2015    2015年10月

  • ニードル状アナターゼ型二酸化チタンの形態制御と色素増感太陽電池用多孔質電極膜の構造制御

    菊地貴寛, 冨田 恒之, 関彩希江, 功刀 義人, 梅津信二郎, 垣花眞人

    第28回秋季シンポジウム    2015年09月

  • 704 3Dプリンタ造形物表面粗さの向上(OS7-(1),OS7 オーガナイズドセッション≪精密/微細加工と評価≫)

    高岸 賢輔, 梅津 信二郎

    茨城講演会講演論文集 : Ibaraki district conference   2015 ( 23 ) 67 - 68  2015年08月

     概要を見る

    Grooves were generated on the surface of the molding when the 3D structures were printed. The grooves were difficult to remove by the abrasive finishing process because the grooves exist inside of the printed structures. When the printed surface was melted and reformed utilizing chemical melting process, the grooves will be disappeared and smooth surface will be appeared. We named this process as the 3D chemical melting finisher (3D-CMF). In this paper, we investigated the fundamental characteristics of the 3D-CMF.

    CiNii

  • MoF-4 DEVELOPMENT OF MICRO 3D PRINTER AND ITS FUTURE APPLICATIONS

    Umezu Shinjiro, Ohmori Hitoshi

    Proceedings of ... JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment : IIP/ISPS joint MIPE   2015   "MoF - 4-1"-"MoF-4-3"  2015年06月

     概要を見る

    3D printer was now applied to fabricate not only anime figures but also industrial products those were parts of vehicle and airplane. Actually, the machining accuracy is less than the ultraprecision machining's. However, relatively complex structures are easy to fabricate utilizing commercial 3D printer. In this paper, we would like to introduce the development of originally developed micro 3D printer and its future applications of biotechnology field and green technology field.

    CiNii

  • 長さの異なるニードル状アナターゼ型TiO2の合成と色素増感太陽電池への応用

    菊地貴寛, 古江美和子, 冨田恒之, 下山夕貴, 功刀義人, 梅津信二郎, 垣花眞人

    日本セラミックス協会年会講演予稿集(CD-ROM)   2015   ROMBUNNO.1E19  2015年03月

    J-GLOBAL

  • 色素増感太陽電池のTiO2電極の階層的構造構築

    菊池貴寛, 古江美和子, 坪田凌吾, 冨田 恒之, 下山夕貴, 功刀 義人, 梅津信二郎, 垣花眞人

    平成26年度神奈川県ものづくり技術交流会    2014年10月

  • 413 溶融含浸法による炭素繊維/超耐熱セラミックス複合材の試作(OS4-(3),OS4 オーガナイズドセッション《材料・組織と加工》)

    和田 寿也, 矢野 友規, 青木 卓哉, 小笠原 俊夫, 岩森 暁, 梅津 信二郎

    茨城講演会講演論文集 : Ibaraki district conference   2014 ( 22 ) 153 - 154  2014年09月

     概要を見る

    This paper discusses a melt infiltration method to introduce HfC or ZrC into carbon-fiber-reinforced carbon matrix (C/C) composites. In order to form HfC or ZrC in the porosities of C/C composites, molten HfSi_2 and Zr-10at.%Si alloy were infiltrated. The MI treatments of HfSi_2 and Zr-10at.%Si alloy were conducted by heating specimens up to 1800℃ and 1900℃ under vacuum. The matrix formed by the HfSi_2-MI had a dense microstructure comprising HfC, SiC, and HfSi_2. Whereas, the matrix formed by the Zr alloy MI had a dense microstructure comprising ZrC, ZrSi, and Zr.

    CiNii

  • 713 光閉じ込め効果を用いた色素増感型太陽電池の作製(OS7-(4),OS7 オーガナイズドセッション《精密/微細加工と評価》)

    小川 真史, 川田 茂人, 岩森 暁, 功刀 義人, 梅津 信二郎

    茨城講演会講演論文集 : Ibaraki district conference   2014 ( 22 ) 121 - 122  2014年09月

     概要を見る

    Dye-sensitized solar cell (DSC) is expected as a portable power of flexible printed electronics device. However Problem of DSC is low efficiency. We have optimized titania layer for high efficiency by utilizing inkjet technology. We have achieved efficiency of 8.3%. Therefore, we focused on light trapping effect for increasing efficiency. Light trapping effect is a phenomenon to increase the absorption of light by reflecting light. This effect is obtained by titania layer of large particles on titania layer of small particles. In this study, we fabricated DSC of two titania layers structure. Efficiency of DSC is the highest 8.7% in this laboratory.

    CiNii

  • 色素増感太陽電池の二酸化チタン光活性電極における結晶多形の影響

    古江美和子, 冨田 恒之, 下山夕貴, 功刀 義人, 梅津信二郎, 垣花眞人

    日本セラミックス協会 第27回秋季シンポジウム    2014年09月

  • 色素増感太陽電池に向けたニードル状アナターゼナノ結晶の合成と解析

    菊地貴寛, 古江美和子, 冨田 恒之, 下山夕貴, 功刀 義人, 梅津信二郎, 垣花眞人

    日本セラミックス協会 第27回秋季シンポジウム    2014年09月

  • Spray-coated Pt counter electrode of dye-sensitized solar cell utilizing electrostatic inkjet printing

    Shinjiro Umezu, Kyosuke Kosugi, Yoshihito Kunugi, Yuki Shimoyama

    JAPANESE JOURNAL OF APPLIED PHYSICS   53 ( 5 )  2014年05月

     概要を見る

    Dye-sensitized solar cell (DSC) is highly focused because of low-cost. Generally, DSC was composed of photoelectrode, dye, electrolyte, and counter electrode (CE). Sputter-coated Pt on the fluorine doped tin oxide (FTO) electrode was mainly used as CE, however it was expensive and low speed fabrication. In this study, we tried to apply the spray mode of the electrostatic inkjet printing for fabrication of CE. Fundamental characteristics were investigated with the spray-coated Pt CE, the sputter-coated Pt CE, and FTO CE. Conversion efficiency was very low in case of FTO CE. Efficiency of spray-coated Pt CE was 3.6%. The efficiency was a little lower than that of commonly used sputter-coated Pt CE because Pt was not completely coated on the FTO glass by the inkjet printing. These results indicated that spray-coated Pt on FTO glass had possibility to be used as CE of DSC. (C) 2014 The Japan Society of Applied Physics

    DOI CiNii

  • Precision printing of gelatin utilizing electrostatic inkjet

    Umezu Shinjiro

    Jpn. J. Appl. Phys.   53 ( 5 )  2014年04月

    CiNii

  • H-2-1 静電スプレー法を用いたスプレー領域の制御

    小川 真史, 川田 茂人, 梅津 信二郎, 大森 整

    IIP情報・知能・精密機器部門講演会講演論文集   2014   "H - 2-1-1"-"H-2-1-2"  2014年03月

     概要を見る

    We fabricate titania layer of Dye-sensitized Solar Cell by electro-spray. When high voltage is applied to a tube filled with conductive liquid, electro-spray takes place. We have demonstrated that conversion efficiency of fabricated cell is higher than conventional method. When the distance of the target from the nozzle tip is large, sprayed area is large. Moreover, deposition time is increased. To prevent this problem, dielectric material is installed between syringe and target. Therefore, spray area uses the electric charge which particles have, and is controlled. We have demonstrated that the focusing property is possible in this experiment.

    CiNii

  • 色素増感太陽電池の光活性電極に向けたチタン系酸化物の合成と評価

    古江美和子, 冨田恒之, 下山夕貴, 功刀義人, 梅津信二郎, 垣花眞人

    日本セラミックス協会年会講演予稿集(CD-ROM)   2014   ROMBUNNO.1I21  2014年03月

    J-GLOBAL

  • ニードル状アナターゼ型二酸化チタンを光活性電極に用いた色素増感太陽電池の性能向上

    菊地貴寛, 古江美和子, 冨田恒之, 下山夕貴, 功刀義人, 梅津信二郎, 垣花眞人

    日本セラミックス協会年会講演予稿集(CD-ROM)   2014   ROMBUNNO.1P117  2014年03月

    J-GLOBAL

  • 1003 分光光路を用いた色素増感型太陽電池の高効率化(OS7 オーガナイズドセッション《精密/微細加工と評価,マイクロ・ナノ工学》)

    川田 茂人, 梅津 信二郎, 功刀 義人, 大森 整, 下山 夕貴

    茨城講演会講演論文集 : Ibaraki district conference   2013 ( 21 ) 225 - 226  2013年09月

     概要を見る

    Dye-Sensitized Solar Cell (DSC) has good characteristics those are flexible and colorful. DSC is low efficiency. It is about 10%. This paper challenge to high efficiency for DSC with dichroic mirrors.

    CiNii

  • 様々な二酸化チタン結晶多形の合成と色素増感太陽電池への応用

    古江美和子, 冨田恒之, 下山夕貴, 功刀義人, 梅津信二郎, 垣花眞人

    日本セラミックス協会秋季シンポジウム講演予稿集(CD-ROM)   26th   ROMBUNNO.2K02  2013年08月

    J-GLOBAL

  • インクジェット技術による色素増感型太陽電池に用いるTiO₂薄膜の最適化

    小杉 恭介, 梅津 信二郎, 川田 茂人

    Imaging Conference Japan論文集     49 - 51  2013年

    CiNii

  • マイクロデジタルファブリケーション技術による色素増感型太陽電池のチタニア層のパターン形成 (プリンティング技術の進化)

    梅津 信二郎

    コンバーテック   41 ( 1 ) 93 - 96  2013年01月

    CiNii

  • J164023 インクジェット技術を利用した色素増感型太陽電池の作製

    八田 達, 梅津 信二郎, 功刀 義人

    年次大会 : Mechanical Engineering Congress, Japan   2012   "J164023 - 1"-"J164023-3"  2012年09月

     概要を見る

    Many researchers are engaged on dye-sensitized solar cell (DSSC) because DSSC is cheap and easy to fabricate. However efficiency of DSSC is not so high. The main purpose of the study on the DSSC is to improve the efficiency. Former studies were focused on the shape and chemical characteristics of titania and pigments, the efficiency was relatively increased. Because best thickness will depend on kind of titania paste, fabrication method that can change the thickness easily should be developed. We have been developing new Inkjet technology that name is PELID (Patterning with Electrostatically-Injected Droplet) method. When the strong electric field is applied to a nozzle, small droplets are ejected by the electrostatic force. In this paper, we have been applying the PELID method to pattern titania layer on FTO glass. We investigated the thickness in case that the patterning time is changed because the efficiency depended on the thickness.

    CiNii

  • 514 PELID法を用いたTiO_2薄膜の作製(OS7-4 オーガナイズドセッション《精密/微細加工と評価》)

    石井 貴之, 梅津 信二郎, 大森 整, 功刀 義人, 石射 明日香, Kousugi Kyousuke, Kawata Shigeto

    茨城講演会講演論文集 : Ibaraki district conference   2012 ( 20 ) 135 - 136  2012年08月

     概要を見る

    Many researchers are engaged on dye-sensitized solar cell (DSSC) because DSSC is cheap and easy to fabricate. However efficiency of DSSC is not so high. The main purpose of the study on the DSSC is to improve the efficiency. Former studies were focused on the shape and chemical characteristics of titania and pigments, the efficiency was relatively increased. Because best thickness will depend on kind of titania paste, fabrication method that can change the thickness easily should be developed. We have been developing new inkjet technology that name is PELID (Patterning with Electrostatically-Injected Droplet) method. When the strong electric field is applied to a nozzle, small droplets are ejected by the electrostatic force. In this paper, we have been applying the PELID method to pattern titania layer on FTO glass. We investigated the thickness in case that the patterning time is changed because the efficiency depended on the thickness.

    CiNii

  • 513 PELID法のパターンニング制御(OS7-4 オーガナイズドセッション《精密/微細加工と評価》)

    八田 達, 梅津 信二郎, 大森 整

    茨城講演会講演論文集 : Ibaraki district conference   2012 ( 20 ) 133 - 134  2012年08月

     概要を見る

    Currently, chronic donor shortage is a concern. Therefore much attention has been gathered in regenerative medicine. Technology is necessary in order to achieve this, high accuracy patterning biomaterial into living cells. PELID method is to solve this problem is possible. However, there also exists a biomaterial that inhibits the formation of Taylor cone. This was thought to be due to loss of precision occurs. To solve this problem, we invented a method to insert a tungsten wire inside the nozzle.

    CiNii

  • 314 トンボ翅脈上の微細突起物の空力特性(OS3-4 オーガナイズドセッション《熱・流体・エネルギー変換工学の進展》)

    田中 芳昌, 秋山 寛郎, 梅津 信二郎, 畔津 昭彦, 橋本 巨

    茨城講演会講演論文集 : Ibaraki district conference   2012 ( 20 ) 83 - 84  2012年08月

     概要を見る

    Now, MAV (Micro Air Vehicle) that mimic a dragonfly's flight is being researched, because, dragonflies have high flight performances. In order to develop MAV that mimic a dragonfly's flight, it is important to investigate the aerodynamic characteristics of the micro spikes on a dragonfly's wing vein. However, the concrete effects of micro spikes have not been understood. In this paper, artificial wings with micro spikes that mimic Dragonfly's wings were prepared. Moreover, we experimented to investigate the aerodynamic characteristics of their wings. We found that micro spikes generated strong vortexes. As a result, we clarified one end of the flight mechanism of the dragonfly which did not become clear until now.

    CiNii

  • (18)マイクロデジタルファブリケーション技術を利用したバイオエンジニアリング・グリーンテクノロジーへの応用に関する研究(研究奨励,日本機械学会賞〔2011年度(平成23年度)審査経過報告〕)

    梅津 信二郎

    日本機械学会誌   115 ( 1122 ) 279 - 279  2012年

    CiNii

  • 710 ラピッドプロトタイピングによるアルギン酸ナトリウムゲル三次元構造の作製(OS7-(3)オーガナイズドセッション《精密/微細加工と評価》)

    秋山 寛郎, 梅津 信二郎, 橋本 巨, 大森 整

    茨城講演会講演論文集 : Ibaraki district conference   2011 ( 19 ) 195 - 196  2011年08月

     概要を見る

    In late years a study on medical device is conducted flourishingly. However, they are often very hard devices. Therefore, we produced the 3D structure that used a sodium alginate for a development of a flexible medical device. We used the PELID method which is a ink-jet technique using a electrostatic force for fabrication. Fabrication of hollow 3D structure using sodium alginate only is difficult. Therefore we enabled fabrication of hollow 3D structure by we combined gelatin with sodium alginate, and making patterning. The Fabrication of a new sodium alginate micro device is enabled by using this technique.

    CiNii

  • S1602-2-2 トンボ翅脈上突起物の作製(柔軟媒体ハンドリングと画像形成システム(2),社会変革を技術で廻す機械工学)

    秋山 寛郎, 梅津 信二郎, 橋本 巨, 落合 成行, 畔津 昭彦

    年次大会講演論文集   2010 ( 0 ) 83 - 84  2010年

     概要を見る

    Dragonfly was focused by many researchers to develop MAV. Because dragonfly has high flight performances those are the unintended acceleration, the rapid turn and the hovering. We concerned the flight performance influenced by umbos on wing vein of dragonfly. The length and shape of umbos were 10 to 100 μm and oblique circular cone. In this paper, artificial umbos were fabricated by application of the electrolytic polishing. The fabricated umbos were set on a metal sheet by the micro resistance welding.

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  • 2208 静電インクジェット現象を利用したマイクロ加工(要旨講演,一般セッション:柔軟媒体ハンドリング/画像形成機器)

    梅津 信二郎, 片平 和俊, 大森 整, 川本 広行

    IIP情報・知能・精密機器部門講演会講演論文集   2008   302 - 304  2008年03月

     概要を見る

    Electrostatic inkjet phenomena took place when high voltage was applied between an insulative capillary tube filled with ion conductive liquid and a metal plate electrode. Droplet diameter and dropping frequency were controlled by the voltage application. We developed new micro fabrication techniques using commercial etching liquid based on the electrostatic inkjet phenomena. The first technique was a thinning of metal rod. The diameter of the rod was controlled by the time of voltage application between the capillary tube and the metal rod. The other technique was a drilling on a shin metal sheet. Small holes were punctured on the shin sheet. Hole diameter, some 10 μm to some 100 μm was controlled by the amplitude of applied voltage.

    CiNii

  • 静電インクジェット現象を利用したマイクロ3次元造形

    西浦雅登, 山口 識史, 梅津 信二郎, 多田 一幸, 川本 広行

    機講論     305 - 308  2008年

     概要を見る

    A preliminary investigation has been conducted on the three-dimensional micro fabrication utilizing the electrostatic inkjet phenomena. Suspension which disperses alumina nano particles to water was ejected and printed layer by layer to fabricate three-dimensional structures. We have demonstrated that the square shaped grid, 115μm-width, 140μm-height, was capable to fabricate by the electrostatic inkjet.

    CiNii

  • 3804 静電インクジェット現象を利用したマイクロ成膜(S59-1 柔軟媒体ハンドリングと画像形成システム(1),21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

    原 慎孝, 西浦 雅登, 田邉 健太郎, 梅津 信二郎, 多田 一幸, 川本 広行

    年次大会講演論文集   2008 ( 0 ) 271 - 272  2008年

     概要を見る

    An organic photoreceptor (OPC) drum for electrophotography is mainly manufactured by the dipcoating technology. However, large amount of coating solution is necessary for the dipcoating. In this report, we purposed a new coating method for the carrier generation layer of the OPC utilizing a liquid atomization phenomenon of the electrostatic inkjet system. Atomization of the carrier generation solution had been controlled by the applied voltage and the gap, and we have succeeded to coat a uniform film in 10 × 10 mm.

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  • 針対平板電極系コロナ放電場を利用したオゾン送風機構

    川本 広行, 増成 幸数, 梅津 信二郎

    日本機械学會論文集. B編 = Transactions of the Japan Society of Mechanical Engineers. B   73 ( 734 ) 2116 - 2121  2007年10月

     概要を見る

    Experimental and theoretical research has been conducted to investigate basic characteristics of an ozone fan utilizing the ionic wind induced in the pin-to-plate corona discharge field. When a high voltage was applied between the electrodes, the ionic wind, which included ozone, flowed from the pin elecrode to a hole of the plate electrode. It was deduced that (1) the ozone concentration is almost linear with respect to the corona current, (2) the ozone concentration was high with the large pin diameter but almost irrelevant with the gap between the electrodes, (3) the energy efficiency of the negative corona was about 14 times higher that of the positive corona, but it was only several %, (4) the ozone generation was reduced at high temperature. It was estimated that the several ppm ozone could be generated and flowed utilizing the negative discharge and the ozone generation was almost eliminated by turning off the polarity.

    DOI CiNii

  • 針対平板電極系放電場におけるイオン風を利用したマイクロ送風機構

    梅津 信二郎, 鳥飼 建宏, 川本 広行

    日本機械学會論文集. B編 = Transactions of the Japan Society of Mechanical Engineers. B   73 ( 727 ) 789 - 795  2007年03月

     概要を見る

    A preliminary investigation was conducted to clarify fundamental characteristics of a micro fan utilizing ionic wind induced in the pin-to-plate gas discharge field. The fan was consisted of a pin electrode, a plate electrode with a hole and a heated plate under the plate electrode. When high voltage was applied between the electrodes, ionic wind flowed through the hole of the plate electrode toward the heated plate. This paper was focused on optimization of the electrode configuration and the enhancement of cooling effect by experiment and calculation. A numerical calculation was conducted by two steps. The corona discharge field was calculated with the finite element method and ionic wind induced by the migration of ions was calculated with the finite differential method. The experimental investigation deduced that: (1) The flow rate was increased with the increase of the hole diameter and the static pressure was increased with the increase of the plate thickness. (2) A gap〜to〜hole diameter ratio of 0.8 to 1.1 was found to be an optimal value that gives the highest power and efficiency. (3) The enhancement of the heat transfer coefficients was increased with the increase of the distance between the plate electrode and the heated plate. These experimental results were in good agreement with the calculated results.

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  • 1207 静電力を利用したインクジェット描画(要旨講演,柔軟媒体ハンドリング/画像形成機器)

    田邉 健太郎, 堀川 孝史, 梅津 信二郎, 川本 広行

    IIP情報・知能・精密機器部門講演会講演論文集   2007   128 - 130  2007年03月

     概要を見る

    A preliminary investigation has been conducted on the control of a micro-droplet in electrostatic inkjet phenomena, because the electrostatic inkjet has a merit that the formation and locus of the droplet can be controlled by the application of the electric field. It was observed that a Taylor cone of the ink was formed at the tip of a tube and the tip of the cone was broken to form a very small droplet. It was demonstrated that highly fine image, 2,700dpi Kanji character, was printed on a paper utilizing this phenomenon.

    CiNii

  • 進行波電界による粒子の粒度分別

    川本 広行, 岡田 洋司, 賀嶋 哲也, 梅津 信二郎

    日本機械学会論文集. C編   72 ( 723 ) 3509 - 3516  2006年11月

     概要を見る

    The authors have developed five kinds of techniques on electrostatic classification of particle size utilizing the balance of the electrostatic and gravitational force. The first is an inclined plate conveyer system. A plate conveyer consisted of parallel electrodes was constructed and four-phase traveling field was applied to the electrodes to transport particles on the conveyer. Particles were classified with size under the voltage application of appropriate frequency based on the feature that small particles were transported upward against the gravity but large particles were apt to fall down. The second technique was an inclined tube conveyer system. The principle is common with that of the inclined plate system. The third technique utilizes a circular electrostatic conveyer similar with the mass spectroscopy. The forth is also circular but utilizes the feature that a locus of the small particle is high compared to that of the large particle. The last is the combination of the linear conveyer and an electrostatic separation roller located at the end of the conveyer. Small particles were attached onto the roller charged by a charger roller. These techniques are expected to be utilized to the classification of toner and carrier particles used in electrophotography.

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  • 448 進行波電界による粒子の粒度分別

    大河原 重元, 岡田 洋司, 鹿嶋 哲也, 梅津 信二郎, 川本 広行

    Dynamics & Design Conference   2006   "448 - 1"-"448-6"  2006年08月

     概要を見る

    The authors have developed four kinds of techniques on electrostatic classification of particle size utilizing the balance of the electrostatic and gravitational force. The first is an inclined plate conveyer system. The plate conveyer consisted of parallel electrodes. Four-phase traveling field is applied to the electrodes to transport particles. The second is an inclined tube conveyer system. The third is a vortex electrode conveyer system. The last is the combination of the plate conveyer and an electrostatic separation roller. These techniques are expected to be utilized to the classification of toner and carrier particles used in electrophotography.

    CiNii

  • 1A1-C31 静電インクジェットを用いたマスクレス回路描画技術の開発

    梅津 信二郎, 中澤 良亮, 堀川 孝史, 川本 広行

    ロボティクス・メカトロニクス講演会講演概要集   2006   "1A1 - C31(1)"-"1A1-C31(3)"  2006年

     概要を見る

    We have been developing a mask-less printing technology for microelectronic circuits utilizing an electrostatic inkjet system. Drops of paste that contained Ag nano-particles were injected on a substrate by the electrostatic force to form electrode patterns. The formation of the drop was controlled by the application of pulse voltage between the plate electrode and a fine tube that contains Ag paste. It was demonstrated that line electrodes of 200 μm pitch were successfully printed on a glass substrate. A multi-layered printing was also realized by overcoating glass paste on the electrode.

    CiNii

  • 静電インクジェット現象を利用した電気回路パターンの描画 (日本画像学会年次大会(通算97回) Imaging Conference JAPAN 2006 論文集)

    堀川 孝史, 梅津 信二郎, 川本 広行

    Imaging Conference Japan論文集   2006   83 - 86  2006年

    CiNii

  • 静電力を利用したマイクロ斜毛・斜板駆動機構

    梅津 信二郎, 白石 潤平, 川本 広行, 伊東 圭昌

    日本機械学会論文集. C編   71 ( 706 ) 1884 - 1891  2005年06月

     概要を見る

    This paper proposed new micro electrostatic driving mechanisms utilizing anisotropic feature of friction. One of the driving mechanisms consisted of parallel plate electrodes and a slanted-fiber sheet between the electrodes. When AC voltage was applied between the electrodes, alternative electrostatic force caused linear motion of the mechanism due to anisotropic feature of the friction between fibers and the lower electrode. The achieved velocity was about 10 mm/s in reverse of the fiber-slanted direction, and it roughly agreed with the numerical calculation based on a lamped dynamic model. Another mechanism was proposed because it was difficult to control friction coefficient and critical frequency of driving mechanism by the slanted-fiber sheet. It consisted of parallel plate electrodes and two slanted-plates made of polyester between the electrodes. The achieved velocity was about 5 mm/s. However, the driving direction of slanted-plate mover was opposite of the direction of slanted-fiber mover. Based on this experimental fact, relationship between the driving direction and the friction coefficient was investigated. We also proposed a rotational driving mechanism and a linear driving mover without a lead to provide voltage to the mover.

    DOI CiNii

  • 静電力を利用する用紙の分離と搬送機構

    梅津 信二郎, 白石 潤平, 西村 秀明, 川本 広行

    日本機械学会論文集. C編   71 ( 704 ) 1361 - 1367  2005年04月

     概要を見る

    A new paper separation and feed mechanism is proposed to realize a highly reliable paper handling system for printers. A prototype mechanism consisted of a plate or roller separation electrode coated with an insulated film, a ground electrode, and a paper pile between the electrodes. When high voltage was applied between the electrodes, charge was excited on the insulating film and eletrostatic force is applied to the paper. Electrostatic separation of a sheet of paper was realized at the top of the pile when the applied voltage exceeded a threshold voltage to generate electrostatic force large than the weight of a sheet of paper. The threshold voltage was about some kV, and it agreed with the numerical value obtained by the FEM calculations for the electrostatic field. In the next step the roller electrode was rotated to feed the attached paper. However the applied voltage had to be increased to separate subsequent papers, because charge on the insulated film was cancelled by the attached paper. Then a biased charger roller was settled in contact with the roller electrode to charge the insulating film on the roller separation electrode. In this system, reliable paper separation and feed was realized and a feed speed over 600 mm/s was demonstrated.

    DOI CiNii

  • 1212 コロナ放電場を利用したマイクロ送風機構(要旨講演,柔軟媒体ハンドリング/画像形成機器)

    鳥飼 建宏, 梅津 信二郎, 山村 雄一, 福山 明, 川本 広行

    IIP情報・知能・精密機器部門講演会講演論文集   2005   136 - 139  2005年03月

     概要を見る

    Experimental research was conducted to investigate basic characteristics of micro fan utilizing ionic wind in pin-to-plate gas discharge field. When high voltage was applied between the electrodes, ionic wind flowed toward heated plate through a hole of plate electrode. This research was focused on optimization of the electrode configuration by investigating the performance of the fan and the enhancement of the local heat transfer coefficients. The main conclusions were: (1) Flow rate increased with the increase of the hole diameter, and in the same hole diameter, static pressure increased with the increase of the plate thickness. (2) A gap-to-hole diameter ratio of 0.86 was found to be an optimal value that gives the highest peak power and efficiency. (3) The enhancement of the heat transfer coefficients increased with the increase of the distance between the plate electrode and the heated plate.

    CiNii

  • 1213 静電力を利用したリードレス斜柱駆動機構(要旨講演,柔軟媒体ハンドリング/画像形成機器)

    梅津 信二郎, 山村 雄一, 安藤 大樹, 増成 幸数, 佐藤 宏暢, 川本 広行

    IIP情報・知能・精密機器部門講演会講演論文集   2005   140 - 142  2005年03月

     概要を見る

    This paper proposed an electrostatic driving mechanism utilizing slanted-pillars without a lead to apply alternative step voltage to a movable electrode. The movable electrode fixed on the slanted-pillars was set on two parallel fixed electrodes. When one electrode was connected to V_0 and the other to the ground, the movable electrode was V_0/2 because capacitances between movable electrode and each fixed electrode are almost same. Alternative electrostatic force caused linear motion of the mover due to anisotropic feature of the friction between pillars and the fixed electrodes. The achieved velocity was about 500μm/s.

    CiNii

  • 1211 静電選別を利用した粒度分別(要旨講演,柔軟媒体ハンドリング/画像形成機器)

    岡田 洋司, 梅津 信二郎, 曽我部 広, 黒宮 直幸, 川本 広行

    IIP情報・知能・精密機器部門講演会講演論文集   2005   133 - 135  2005年03月

     概要を見る

    A preliminary experiment was conducted to classify particle size from mixed particles utilizing electrostatic force. An experimental setup was composed of two parts. One was a parallel electrode array which transported particles by virtue of the electrostatic traveling wave and another was a charged separation roller located on the upper side of the array. It was demonstrated that particles were charged on the parallel electrodes and small particles were attached to the separation roller, when the traveling electrostatic wave was applied to the parallel electrode.

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  • 針対平板電極系放電場に生じる力を利用するマイクロ駆動機構

    梅津 信二郎, 川本 広行

    日本機械学会論文集. C編   70 ( 699 ) 3260 - 3265  2004年11月

     概要を見る

    Two driving mechanisms were constructed and these characteristics were investigated. The mechanisms utilize force generated in a pin-to-plate gas discharge system that consisted of a rigid pin electrode and a plate electrode. One of the driving mechanisms utilizes force generated at dark discharge region, because attractive force, in the order of 10 fiN, was induced to the pin electrode due to the Coulomb force at this region. A stator consisted of parallel plate electrodes on a plastic plate and small linear movers were needle and/or plate electrodes on floating plastic plates. Experimental investigation deduced that (1) the speed of the movers was increased at high frequency of the applied voltage and a small air gap, but (2) the motion of the movers were out of tuning over a threshold frequency. Another driving mechanism utilizes force generated at corona discharge, because corona discharge took place over a certain threshold voltage and a relatively large repulsive force, in the order of 100 μN, was induced to the pin electrode due to the ionic wind. The force was almost tangential to the pin electrode even when the pin electrode inclined to the plate electrode. This force was utilized for driving small linear and rotational movers on water. The linear mover was an inclined pin electrode on a floating plate and the rotational mover consisted of two inclined pin electrodes on a floating disk at point-symmetrical positions. Experimental investigation deduced that (1) the driving force was induced over the corona onset voltage, (2) the driving force or torque were maximum when the inclination angle was 45 degrees, and (3) the speed of the movers was increased at high applied voltage and a small air gap.

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  • 針対平板電極系放電場における火花放電時に働く力について

    梅津 信二郎, 曽我部 広, 川本 広行

    日本機械学会論文集. C編   70 ( 692 ) 1149 - 1154  2004年04月

     概要を見る

    It was investigated whether the electrostatic force was generated at the spark discharge on a pin electrode in a pin-to-plate gas discharge system. Because it was not possible to measure the force directly at a short sparking period, three independent metcods were employed, to evaluate the existence of the force indirectly. (1) Axial vibration was observed at the intermittent spark discharge for the softly supported pin electrode. The force was explicitly calculated in the case that the calculated vibration was well agreed with the measured. This experiment indicated that the force was almost 0 N at the spark discharge. The vibration was generated not by the force at the spark discharge but by alternative ionic wind at corona discharge. (2) A similar experiment was conducted whether the vibration magnitude depended on the spark current. The current at the spark discharge was varied by a circuit resistor. The experiment deduced that the force did not generated at the spark period and it was independent on the current. (3) Axial vibration could be observed when the voltage pattern that was common with that with the spark discharge was applied, if no force was applied to the pin electrode. To confirm it an experiment was conducted with two parallel-connected pin-to-plate gas discharge systems, one of which air gap was shorter than the other. The axial vibration of the longer air gap, in which the spark discharge did not take place, was observed and vibration also agreed quantitatively with calculated one. These three results suggested that no substantial force was generated at the spark discharge.

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  • 静電インクジェット現象における微小液滴吐出(柔軟媒体ハンドリング/画像形成機器,IIP2004 情報・知能・精密機器部門講演会)

    鈴木 穂高, 梅津 信二郎, 小泉 竜太, 川本 広行

    IIP情報・知能・精密機器部門講演会講演論文集   2004   254 - 257  2004年03月

     概要を見る

    A preliminary investigation was conducted on electrostatic inkjet phenomena. High voltage was applied between an insulative capillary tube filled with ion-conductive water and a plate electrode. At the beginning of corona discharge, a Taylor cone was formed at the tip of the tube and the top of the cone was broken to form a very.small droplet that was dispersed like mist at wide angle due to the Coulomb repulsive force of charged mist. When the applied voltage was further increased, water droplet was formed periodically. The charge to mass ratio of the drop was measured and compared with the Rayleigh's and Vonnegut's limits. It was less than the Rayleigh's limit but agreed fairly well with the Vonnegut's limit.

    CiNii

  • 針対平板電極系コロナ放電場におけるイオン風について

    川本 広行, 安田 悠, 梅津 信二郎

    日本機械学會論文集. C編 = Transactions of the Japan Society of Mechanical Engineers. C   70 ( 689 ) 169 - 175  2004年01月

     概要を見る

    Electroaerodynamic investigation has been carried out in a pin-to-plate gas discharge system to clarify the mechanism of repulsive force generation between the pin and the plate electrode at corona discharge. Numerical calculation has been conducted by two steps. At the first place, corona discharge field was calculated with the finite element method to deduce volumetric force ρE, where ρ is the charge density and E is the electric field, applied to the air, and then induced ionic wind was calculated with the finite differential method. Calculated pressure distribution on the plate electrode was in the order of 10 Pa that was in good agreement with the measured pressure distribution. Calculated velocity at the center was several m/s that is confirmed by a time-of-flight experiment and the velocity distribution near the pin electrode also agreed with the measured with a laser Doppler velocimeter. Pressure and wind velocity were increased at high applied voltage. These results confirm that the ionic wind is the cause of the repulsive force to the pin electrode at the corona discharge.

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  • 静電力を利用する斜毛駆動機構の運動解析(S63 柔軟媒体ハンドリングと画像形成システム)

    川本 広行, 梅津 信二郎, 白石 潤平, 伊東 圭昌

    年次大会講演論文集   2004 ( 0 ) 375 - 376  2004年

     概要を見る

    This paper describes an analysis of a new electrostatic driving mechanism utilizing a slanted-fiber sheet. The mechanism consists of parallel plate electrodes and a slanted-fiber sheet between the electrodes. When AC voltage is applied between the electrodes, alternative electrostatic force causes linear motion of the mechanism due to anisotropic feature of the friction between fibers and the lower electrode. The achieved velocity is about 10 mm/s, and it roughly agreed with the numerical value based on a lamped dynamic model. This mechanism is expected to be utilized for precise positioning of a sheet of paper.

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  • 220 針対平板電極系放電場におけるイオン風について

    山村 雄一, 梅津 信二郎, 川本 広行, 村田 昭彦, 池尻 徳貴, 吉沢 正紹

    Dynamics and Design Conference : 機械力学・計測制御講演論文集 : D & D   2003 ( 0 ) 94 - 94  2003年09月

     概要を見る

    Electroaerodynamic investigation has been carried out in a pin-to-plate gas discharge system to clarify the mechanism of repulsive force generation between the pin and the plate electrode at corona discharge. Numerical calculation has been conducted by two steps. At the first place, corona discharge field was calculated to deduce volumetric force and then induced ionic wind was calculated. Calculated pressure distribution on the plate electrode was in the order of 10 Pa that was in good agreement with the measured. Calculated velocity at the center was several m/s that is confirmed by a time-of-flight experiment and the velocity distribution near the pin electrode also agreed with the measured with a laser Doppler velocimeter. These results confirm that the ionic wind is the cause of the repulsive force at the corona discharge.

    CiNii

  • 針対平板電極系放電場における静電静水力学効果について

    川本 広行, 梅津 信二郎, 小泉 竜太, 白石 潤平

    日本機械学會論文集. C編 = Transactions of the Japan Society of Mechanical Engineers. C   69 ( 678 ) 328 - 334  2003年02月

     概要を見る

    Electrohydrostatics was investigated in a pin-to-plate discharge system that consisted of the rigid pin electrode made of metal and the ion-conductive water electrode. At the dark discharge region, because extremely small electrostatic pull force, Coulomb force in the order of 10 μN, was induced, water shifted upward in the order of several 10 μm at the opposite center to the pin electrode. 0ver a threshold voltage corona discharge took place and a relatively large repulsive force, in the order of 100 μN, was induced due to the ionic wind. It depressed water and a large depression of water, in the order of several 100 μm at the center, was observed even to the naked eye. This phenomenon was named &quot;Electrostatic Moses Effect.&quot; Deformation of the water level coincided with the pressure distribution on the metal plate electrode, if the surface tension of water and Coulomb force was included in the estimation to derive pressure distribution from the measured deformation of the water level. At the dark discharge region total force to the water electrode coincided with that to the pin electrode. However, it was larger than that to the pin electrode at corona discharge, because the reaction force due to the ionic wind was applied not only to the pin electrode but also to other part of the opposite electrode at the corona discharge.

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  • 針対平板電極系放電場における静電静水力学効果について

    川本 広行, 梅津 信一郎, 小泉 竜太, 白石 潤平, 安田 悠

    電気学会研究会資料. ED, 放電研究会   2003 ( 1 ) 7 - 13  2003年01月

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  • P-CM-01 Electrostatic Inkjet Phenomena Utilizing Pin-to-Plate System

    KAWAMOTO Hiroyuki, ARAI Kenji, KOIZUMI Ryuta, UMEZU Shinjiro

    Proceedings of ... JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment : IIP/ISPS joint MIPE   2003   327 - 328  2003年

     概要を見る

    A preliminary investigation is conducted on electrostatic inkjet phenomena. High voltage is applied between an insulative capillary tube filled with water and a metal plate electrode. Inkjet phenomenon is observed at the dark discharge under conditions of appropriate tube diameter and water level. At the beginning of corona discharging, however, water mist is dispersed at wide angle from the tip of the tube. At higher voltage, water mist becomes to be dispersed like spray. Application of pulsed voltage can form a droplet that is synchronized with the pulse. This phenomenon is expected to be applied to a new inkjet print head.

    CiNii

  • P-CM-02 Paper Separation and Feed Utilizing Electrostatic Force

    KAWAMOTO Hiroyuki, UMEZU Shinjiro, SHIRAISHI Jumpei

    Proceedings of ... JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment : IIP/ISPS joint MIPE   2003   329 - 330  2003年

     概要を見る

    A new paper-separation system is proposed to realize a highly reliable paper handling system for printers. The system consists of a pair of parallel plate electrodes and a paper pile between the electrodes. In this system, electrostatic separation of a sheet of paper on the top of the pile was realized when the applied voltage exceeded a threshold. Experimental results agreed with numerical ones calculated by the FEM on the electrostatic field.

    CiNii

  • 3224 斜毛シートを用いた静電駆動機構について

    白石 潤平, 梅津 信二郎, 黒宮 直幸, 川本 広行

    年次大会講演論文集   2003 ( 0 ) 285 - 286  2003年

     概要を見る

    This paper proposes new electrostatic driving mechanisms with slanted-fiber seats. One of the mechanisms consisted of a plate electrode and the seat with slanted-fibers. AC voltage was applied between the plate electrode and a ground electrode. Alternative electrostatic force caused linear motion of the mechanism due to anisotropic feature of the friction between fibers and the ground electrode. The demonstrated velocity was about 10 nm/s. Another mechanism consisted of the plate electrode and two seats of which fibers were slanted in opposite directions with each other. Rotation of the mechanism was realized because linear driving force was cancelled but torque was induces to the plate electrode. The demonstrated speed was in the order of 0.1 s^&lt;-1&gt;

    DOI CiNii

  • 3225 静電力を利用した紙の分離に関する研究

    梅津 信二郎, 白石 潤平, 西村 秀明, 川本 広行

    年次大会講演論文集   2003 ( 0 ) 287 - 288  2003年

     概要を見る

    A new mechanism of paper-separation system is proposed to realize a highly reliable paper handling system for printers. The system consists of a pair of parallel electrodes and paper pile between the electrodes. In this system, electrostatic separation of a piece of paper was realized always at the top of the pile when the applied voltage exceeded a threshold voltage to generate electrostatic force larger than the weight of a piece of paper. The threshold voltage was about some kV, and it agreed with the numerical value calculated by the finite element method for the electrostatic field. Additionally, lateral pull-off force of a paper from the attached electrode was measured to confirm the required force to feed the separated paper. The value was in the order of 10 μN/(mm)^2 that was also in the same order as the calculated pull-off force estimated from the electrostatic force between the plate electrode and the adhered paper and the friction coefficient between them.

    DOI CiNii

  • 針対平板電極系における静電インクジェット現象

    川本 広行, 新井 健治, 小泉 竜太, 梅津 信二郎

    電気学会研究会資料. ED, 放電研究会   2003 ( 239 ) 359 - 364  2003年

    CiNii

  • 704 静電力を利用するリニア駆動機構

    梅津 信二郎, 白石 潤平, 川本 広行

    Dynamics and Design Conference : 機械力学・計測制御講演論文集 : D & D   2002 ( 0 ) 278 - 278  2002年09月

     概要を見る

    In a pin-to-plate or plate-to-plate electrode system, extremely small Coulomb force was induced to the electrode. The force was utilized for the driving force of small linear driving mechanisms on water. A stator of this mechanism consisted of parallel plate electrodes on a plastic plate and movers were needle and/or plate electrodes on floating plastic plates. Experimental investigation deduced that (1) the speed of the mechanism was increased at high frequency of the applied voltage and a small air gap but (2) the motion of the mover was out of tuning over a threshold frequency.

    CiNii

  • 702 針対平板電極系放電場におけるイオン風について

    安田 悠, 梅津 信二郎, 白石 潤平, 小泉 竜太, 川本 広行

    Dynamics and Design Conference : 機械力学・計測制御講演論文集 : D & D   702   276 - 276  2002年

     概要を見る

    Aerodynamic investigation has been carried out on the force in a pinto-plate gas discharge system to clarify the mechanism of force generation. Numerical calculation has been conducted with the vorticity-stream function method, where electrostatic force induced by charge in the corona discharge field is applied to the air. Calculated pressure distribution on the plate electrode was in the order of 10 Pa that was in good agreement with the measured pressure distribution. Calculated velocity at the center was several m/s that must be confirmed by a separate experiment.

    CiNii

  • 3237 針対平板電極系放電場を利用する水上移動駆動機構について

    梅津 信二郎, 白石 潤平, 林 怜史, 川本 広行

    年次大会講演論文集   2002 ( 0 ) 237 - 238  2002年

     概要を見る

    In a pin-to-plate gas discharge system, corona discharge took place over a threshold voltage and a relatively large repulsive force, in the order of 100μN, was induced to the pin electrode due to the ionic wind. The force was almost tangential to the pin electrode even when the pin electrode inclined to the plate electrode. The force was utilized for the driving force of small linear and rotational driving mechanisms on water. The linear mechanism was an inclined pin electrode on a floating plate and the rotational mechanism consisted of two pin electrodes on a floating disk at point-symmetrical positions. Experimental investigation deduced that (1) the driving force was induced over the corona onset voltage, (2) the driving force or torque were maximum when the inclination angle was 45 degrees, and (3) the speed of the mechanisms was increased at high applied voltage and a small air gap.

    DOI CiNii

▼全件表示

産業財産権

  • センサフィルム及び積層体

    特許第7070898号

    大矢 貴史, 梅津 信二郎, 福田 憲二郎, 染谷 隆夫, 菊地 鉄太郎, 佐々木 大輔, 清水 達也

    特許権

    J-GLOBAL

  • 施術用袋状体

    松本 美沙, 宮川 克也, 白数 昭雄, 林 真平, 廣瀬 佳代, 内田 寛治, 梅津 信二郎

    特許権

    J-GLOBAL

  • 施術用袋

    廣瀬 佳代, 内田 寛治, 梅津 信二郎, リ ギョウトン

    特許権

    J-GLOBAL

  • 細胞を配向させる細胞培養基材、及びその製造方法

    清水 達也, 菊地 鉄太郎, 梅津 信二郎, 山中 文登

    特許権

    J-GLOBAL

  • 心電モニタリングシステム

    梅津 信二郎, 廣瀬 佳代, 藤枝 俊宣

    特許権

    J-GLOBAL

  • 人工血管ユニットの製造方法及び人工血管ユニット

    梅津 信二郎, 坂口 勝久, 秋元 渓, 清水 達也

    特許権

    J-GLOBAL

  • 中空部を有する三次元構造体およびその製造方法

    梅津 信二郎, 八田 達

    特許権

    J-GLOBAL

  • 静電インクジェット現象を利用した三次元構造を有する細胞組織の作製

    特許第5540304号

    梅津 信二郎, 北嶋 隆, 片平 和俊, 大森 整, 伊藤 嘉浩

    特許権

    J-GLOBAL

  • 形状測定プローブ

    特許第5209440号

    大森 整, 片平 和俊, 梅津 信二郎, 八須 洋輔, 成瀬 哲也, 平井 幸廣, 高橋 忠正, 福田 秀幸, 森 啓太郎

    特許権

    J-GLOBAL

  • 太陽電池用半導体薄膜の製造方法および太陽電池用半導体薄膜

    梅津 信二郎, 功刀 義人

    特許権

    J-GLOBAL

  • シート分離機構

    川本 広行, 梅津 信二郎

    特許権

    J-GLOBAL

▼全件表示

受賞

  • 船井学術賞

    2018年04月   船井情報科学振興財団  

    受賞者: 梅津 信二郎

  • Best Paper Award

    2017年11月   The 13th China-Japan International Conference of Ultra-Precision Machining Process  

    受賞者: 梅津 信二郎

  • 日本材料学会関東支部若手活動賞

    2017年10月   日本材料学会  

    受賞者: 梅津 信二郎

  • 文部科学大臣表彰若手科学者賞

    2015年04月   文部科学省  

    受賞者: 梅津 信二郎

共同研究・競争的資金等の研究課題

  • 脳梗塞、心筋梗塞の事前兆候を高精度に診断するための高度AIシステムの構築

    日本学術振興会  科学研究費助成事業 基盤研究(B)

    研究期間:

    2020年04月
    -
    2023年03月
     

    廣瀬 佳代, 梅津 信二郎

     概要を見る

    本研究で必要な測定デバイス(薄膜心電計と小型パルスオキシメーター)を安定して作製した。さらには、3Dプリンタを援用して、”さりげない”測定を行う場所にあわせたセンサ形状にすることが可能な状況である。
    このようなセンサを用いて、動作をしながらの測定が可能なことを複数の動作に対して実証した。動作を伴うとアーチファクトに伴うエラーが重畳することは想定していた通りであったが、通常の測定センサを用いた場合よりもエラーを小さくできることを確認した。そのうえで、圧力センサ・加速度センサなどと組み合わせることによって、エラーが重畳するタイミングのデータをAI解析の対象にしないシステムを構築した。エラーの重畳を補正した上でAI解析を行う手法または、エラーが重畳している時間をAI判定の対象外とすることで、AI判定精度を上げることが可能になると考えていた。後者の方法を確立できたと考えている。
    測定センサの設置位置を3Dプリンタを援用することによって調整可能であり、設置位置の調整によって、エラーの重畳の仕方が変わることを特定した。
    AI判定に関しては、波形の特徴に注目した解析方法、機械学習を利用した解析方法を並行して進めている。基礎的な検討を行った段階においては、好ましい成果が得られている。
    また、現役医師として、コロナに対する対応が強く求められた状況であったため、関連研究をコロナ対策に応用できないかと考え、手術の現場で利用可能なデバイスを開発した。これに関しては、論文発表、2件の特許申請を行った。日本におけるコロナの状況が、また悪くなってきたため、最大限の努力を継続していく。

  • 生体外で人工心筋細胞組織をモニタリングする超低侵襲性エレクトロニクスシートの開発

    日本学術振興会  科学研究費助成事業 挑戦的研究(萌芽)

    研究期間:

    2020年07月
    -
    2022年03月
     

    梅津 信二郎, 坂口 勝久

     概要を見る

    分化誘導したiPS細胞を利用した創薬研究が注目されている。その際、エレクトロニクスシートを利用して心筋細胞の細胞外電位の測定・評価を行うような研究が展開されている。iPS細胞由来心筋細胞の創薬研究の場合、拍動に伴う動きが発生するため、エレクトロニクスシートのような薄膜を測定に利用することが、好ましい。硬い基板の上で培養した心筋細胞組織の場合、実際のような動きを伴わないため、正確な創薬研究が行えない可能性があるからである。
    申請者らはこのような問題を解決できるスマートエレクトロニクスシートを開発している。本研究では、『生体外で、人工心筋細胞組織をモニタリングするための改良』を行い、特性を評価した。
    エレクトロニクスシートに対して、孔を設けることによって、心筋細胞組織に対する侵襲性を大幅に低減できる。エレクトロニクスシートによって物理的に分断させる細胞間のネットワークを妨げなくなるからである。一方で、このような孔は、局所的に機械的剛性が著しく低下する。逆に考えると、エレクトロニクスシートの剛性を局所的にコントロールできることから、心筋細胞の一次元的な伸縮動作を立体変形へと応用可能である。実際の心臓は立体的なねじり変形を実現しているが、これは心筋細胞の足場材によるものが大きいと考えている。そこで、本年度は、孔のサイズを極小化するとともに、デザインを調整することによる変形などに与える影響をモニタリングした。

  • サイバー・フィジカルシステムによる高精度な心毒性の評価手法の開発

    日本学術振興会  科学研究費助成事業 基盤研究(B)

    研究期間:

    2019年04月
    -
    2022年03月
     

    梅津 信二郎

     概要を見る

    日本は超高齢化社会を迎えている。日本人口に対する高齢者の割合は令和元年において28.4%であり、年々高齢化率は増加している。今後ますます医療関係の負担が増大すると予想されている。テーラーメイド薬に代表されるように、新薬開発に関する研究は盛んである。効果的な薬剤を各患者にあわせて開発することで、副作用がなく(極めて少なく)、治せるという考えからである。一方で、薬の開発には膨大な時間とお金を必要とする。動物とヒトでは薬剤応答が違うなどの理由によって、臨床に至る前に不可となる薬剤が多く発生していたため、膨大な予算を必要とするのは仕方なしと考えられていた。一方で、ヒトiPS細胞を用いた創薬であれば、生体間の薬剤応答の違いが問題になることはないと考えられた。申請者らは、さらに開発精度をあげるにあたり、正確な測定を実現するスマートエレクトロニクスシートの開発、およびヒトiPS細胞由来の細胞組織を対象に、薬剤応答を評価する研究を本研究では推進している。
    今年度は、ノイズが重畳しにくい収縮力測定システムを構築した上で、細胞外電位と収縮力を同時に測定可能な実験系を構築した。発生する収縮力はごく微小であるため、測定系の治具やサポートを極めて小型にしないと測定できないという問題が発生するが、この問題を解決している。その上で、様々な薬剤を対象に、細胞外電位と収縮力を同時に測定した。薬剤投与量に応じて、収縮力や細胞外電位に適切な変化が見られた。先行研究で得られている測定結果と同様の傾向を示した。
    本測定システムにAIシステムを適用することで、細胞外電位と収縮力におけるわずかな変化の前兆と疾患との関係を見抜ける可能性があるので、AIシステムの開発も併せて行っていく。

  • スマートエレクトロニクスシートを搭載した人工心筋細胞組織の開発

    日本学術振興会  科学研究費助成事業 挑戦的研究(萌芽)

    研究期間:

    2018年06月
    -
    2020年03月
     

    梅津 信二郎, 坂口 勝久

     概要を見る

    未病の治癒やヘルスモニタリングを目的として、シート状のエレクトロニクスを皮膚などの生体組織表面に設置し、生体シグナルを計測する研究が近年盛んである。また、自律して拍動する心筋細胞を利用したバイオアクチュエータが注目されている。前者においては、心筋細胞の動きを極力妨げない足場材料(スキャフォールド)が必要であり、後者においては、局所的に機械剛性が異なるスキャフォールドを開発することによって、ユニークな変形を実現可能である。
    これらのニーズを達成するに、本研究では、超薄膜エレクトロニクスに対して局所的に孔を設ける製造方法を確立した上で、機械特性・バイオ特性に関する調査を行った。

  • 革新的マイクロ3Dプリンタの開発

    日本学術振興会  科学研究費助成事業 基盤研究(B)

    研究期間:

    2016年04月
    -
    2019年03月
     

    梅津 信二郎

     概要を見る

    現在、3Dプリンタは、ブームになっている。安価な3Dプリンタが販売され始めたことによるものだが、現状のプリンタでは、高精度なプリントができない。これによって、3Dプリンタを購入したが、希望するような複雑な立体を作製できないという幻滅を生んでしまっている。いっぽう、梅津は、高粘性な液体を高精度にプリント可能なマイクロ3Dプリンタを独自開発しており、立体の細胞組織、ナノポアを作製することで高効率を実現する太陽電池を作製してきた。本研究では、この研究をさらに加速し、革新的な3Dプリンタの開発研究を推進した。

  • マイクロ3Dプリンタと細胞シート技術による3次元状細胞組織の作製

    日本学術振興会  科学研究費助成事業 挑戦的萌芽研究

    研究期間:

    2016年04月
    -
    2018年03月
     

    梅津 信二郎, 坂口 勝久

     概要を見る

    現在、様々なバイオファブリケーション技術が提案されており、これにより、三次元状細胞組織が人工的に作製されている。この組織に毛細血管を内包させることによって、栄養分が内部の細胞に到達し、死滅しない。しかし、毛細血管のように細い組織だけでは、還流する栄養分の量が限定的なため、実際の組織とは異なる。そこで、本研究では、人工細動脈を有する三次元状細胞組織を開発した。

  • 3Dプリンタを用いた三相界面の微細構造作製による固体電解質形燃料電池の性能向上

    日本学術振興会  科学研究費助成事業 挑戦的萌芽研究

    研究期間:

    2016年04月
    -
    2017年03月
     

    吉田 誠, 岡根 利光, 中垣 隆雄, 梅津 信二郎

     概要を見る

    固体電解質形燃料電池において,ネットワークの断裂しない理想的な三相界面の立体的な微細構造を3Dプリンタによって形成すべく,電極,電解質および焼成後に空隙を形成させるための空隙補填剤の三種類のインクジェット用インクを,ノズルからの吐出性と高速な積層体形成の観点から,高濃度,高分散,粘性係数を評価関数として最適化されるように主剤となる溶質,溶媒,分散剤等の種類,濃度および配合比を調整した結果,25μm程度のピッチで完全なネットワークを確保した複数層の三相界面の形成に成功した.

  • マイクロデジタルファブリケーション技術を用いた色素増感型太陽電池の開発

    科学研究費助成事業(東海大学)  科学研究費助成事業(基盤研究(C))

    研究期間:

    2013年04月
    -
    2016年03月
     

    梅津 信二郎

     概要を見る

    マイクロデジタルファブリケーション技術であるマイクロ3Dプリンタを利用して、色素増感型太陽電池のチタニア層の作製を行い、特性の評価を行った。本技術は、精密なパターニングの他に、チタニア層内に、ナノサイズのポアを発生させることが可能であり、これをコントロールすることによって、従来の製造方法であるドクターブレード法による色素増感型太陽電池の製造よりも、高効率な色素増感型太陽電池を作製可能なことを実証した。

  • マイクロバイオデジタルファブリケーション技術による三次元状細胞組織の作製

    科学研究費助成事業(東海大学)  科学研究費助成事業(若手研究(B))

    研究期間:

    2011年
    -
    2012年
     

    梅津 信二郎

     概要を見る

    申請者らが独自に開発している静電マイクロドロップ・インジェクションは、市販のインクジェットプリンタよりも高画質で高粘性な液体の吐出が可能であり、細胞を高精度に生きたままプリント可能なことを実証してきた。また、十分高精度にスキャホールドをプリントできることも実証してきた。複数の細胞を有する細胞組織をプリントする場合、それぞれの細胞を含む液体を満たしたシリンジとスキャホールドを含む液体を満たしたシリンジをマルチノズル化し、各シリンジの位置と印加電圧を制御することで、作製可能である。細胞は、シリンジ内のメディウムに浮遊した状態であり、通常接着している細胞にとって大きなストレスである。浮遊している時間がより短くなるように、装置を改良する必要がある。本研究では、この改良をまず行った。さらに、内部に空洞を有する人工血管を有する三次元状バイオデバイスを作製し、この内部に血管内皮細胞を接着・成長させることが可能なことを実証した。

  • 静電インクジェット現象を利用する電子回路・三次元造形物の直接描画技術の開発

    科学研究費助成事業(独立行政法人理化学研究所)  科学研究費助成事業(若手研究(B))

    研究期間:

    2008年
    -
    2009年
     

    梅津 信二郎

     概要を見る

    静電インクジェット現象を利用した三次元造形物の直接描画技術の開発およびこの応用展開に関する研究を行った。静電インクジェット現象は、高粘性な液体を高画質で吐出可能であるというメリットを有している。この特長を生かして、薄膜フィルム表面に焼結不要な電子回路の描画を行った。また、新しい応用展開として、細胞やゼラチンなどのパターニングを行い、三次元状の細胞組織を作製可能なことを示した。

  • 放電場の駆動力を利用したマイクロ機器の開発

    科学研究費助成事業(早稲田大学)  科学研究費助成事業(若手研究(B))

    研究期間:

    2005年
    -
    2006年
     

    梅津 信二郎

     概要を見る

    放電場で発生する駆動力を利用した送風機構・インクジェット機構・微小粒子ハンドリング機構などのマイクロ機器を開発した.
    針対平板電極系において,電極間に高電圧を印加すると,針電極先端からイオンやオゾンを含む空気流(イオン風)が平板電極に向かって発生する.この空気流を利用してスポット冷却が可能な機構を開発した.また,負を針電極に印加した場合は,正を印加した場合よりも10倍程度オゾンの発生量が多いことがわかっている.このことを利用してスポット消毒・殺菌可能なオゾン送風機構を開発した.
    つぎに,針電極の代わりに液体針電極を用いると,液滴が周期的に吐出される静電インクジェット現象が生じる.この現象の基礎特性とメカニズムの把握をこれまで行ってきた.本年度は,液体として銀ナノ粒子を含むペーストを使用することで電子回路を描画し,ガラスペーストを使用することで三次元造形物を描画した。また,これらのペーストを併用することで,多層の電子回路が描画できることを実証した.
    細胞などの微小な粒子をハンドリングするための双極子プローブを開発した.電圧を印加することで双極子プローブに静電力が発生するので,粒子を捕捉できる.しかし,粒子とプローブ間に働く吸着力が自重を上回るため,電圧の印加を止めるだけでは粒子を分離できない.そこで,双極子プローブにさらに針電極を付け加え,この針電極にコロナ放電が発生する程度の高電圧を印加し,発生するイオン風によって付着した微小粒子をプローブから分離する機構を開発した.

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学内研究費(特定課題)

  • マイクロフードプリンタによるデコレーション

    2016年  

     概要を見る

     実際に食品を製造する際に必要となる描画パターンを開発した高精度マイクロ3Dフードプリンタを用いて複数のサンプルを作製した。本研究で作製した描画パターンは消費者の感覚器が認識可能である50μm以下の精度での描画がなされていることが確認された。またこれらの描画パターンを組み合わせることで、より複雑なパターンを50μm以下の精度で描画することが可能であることを確認した。このことから本研究で開発をした高精度マイクロ3Dフードプリンタを用いることで、消費者が満足しうる食品の製造が可能であることが実証された。

  • 高精度3Dプリンタの開発とこれを用いた人工生体組織の作製

    2014年  

     概要を見る

    3Dプリンタは、金属やプラスチックから構成される立体造形物の作製技術に応用されており、革新的な製造技術として強く期待されている。また、インクジェット型の3Dプリンタは、通常のプリンタと同じように操作できることから、ユザーフレンドリーであり、さらなる発展が期待できる。これまで申請者らは、細胞やゼラチン、コラーゲン、アルギン酸ゲルなどの様々なバイオマテリアルの3Dパターニングが可能なことを実証している。本研究では、このマイクロ3Dプリンタのインクジェットモジュールに温度可変な機構を取り付けることによって、吐出する高分子液体の温度を変え、粘性を下げることによって、より微細なパターニングを可能にした。

  • 放電場を利用したマイクロ駆動機構

    2004年  

     概要を見る

    バイオテクノロジーやマルチメディアへの寄与を目指して,様々なマイクロマシンが提案されている.これまで放電場では短絡によって静電気力が作用しないと考えられていたが,我々の針対平板電極系放電場に関する研究によって,コロナ放電場ではイオン風の反力に起因する100 &#61549;Nオーダの電極が反発する方向の力が生じることがわかっている.本研究では,この針対平板電極系放電場のイオン風を利用した駆動機構・送風機構を作成し,以下のことを明らかにした.○駆動機構1.本駆動機構は,傾けた針電極と対向平板電極から構成される単純な構造である.2.機構の駆動速度や方向を針電極の傾きや印加電圧で単純にコントロールできる.3.並進駆動だけでなく,逆方向に針電極を設置することで回転駆動も可能である.4.また,イオン風の反力を利用した浮上機構を作成可能なことを実証した.○送風機構1.小型で,騒音がないマイクロファンを作成した.2.スポット冷却が可能で,10度程度の冷却が可能であり,0.数%の冷却効率であった.3.針電極と平板電極の位置,印加電圧によって,冷却のスポット径や冷却温度をコントロールできる. その他には,1.針電極の代わりに液体を満たしたチューブを使用することで,液滴が吐出することがわかっている.この現象を回路の配線を描くことに利用した結果,100 &#61549;mオーダのラインが描けた.2.摩擦係数に異方性があるシートの上面に交番的な静電力を作用させると,並進駆動する機構の作成し,特性を把握した結果,印加電圧や印加周波数によって,駆動速度・駆動方向が変わることがわかった.また,駆動メカニズムを計算によって検証した結果,実験結果が概ね妥当だった.3.静電力を利用して,粒径の異なる粒子を分離する機構を試作し,特性を把握した結果,印加電圧が高いほど,分離される粒径が大きくなった.

 

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