Updated on 2023/01/29

写真a

 
NOZAKI, Yoshito
 
Scopus Paper Info  
Paper Count: 0  Citation Count: 0  h-index: 4

Citation count denotes the number of citations in papers published for a particular year.

Affiliation
Research Council (Research Organization), Research Organization for Nano & Life Innovation
Job title
Junior Researcher(Assistant Professor)

Degree

  • 学士

Professional Memberships

  • 2014.06
    -
    Now

    応用物理学会

  • 2013.12
    -
    Now

    日本表面真空学会

 

Research Areas

  • Nano/micro-systems

  • Thin film/surface and interfacial physical properties

  • Electron device and electronic equipment

Papers

  • Validation of droplet-generation performance of a newly developed microfluidic device with a three-dimensional structure

    Yoshito Nozaki, Dong Hyun Yoon, Masahiro Furuya, Hiroyuki Fujita, Tetsushi Sekiguchi, Shuichi Shoji

    Sensors and Actuators A: Physical   331   112917 - 112917  2021.11  [Refereed]  [International journal]

    Authorship:Lead author

    DOI

    Scopus

    3
    Citation
    (Scopus)
  • Efficient Generation of Microdroplets Using Tail Breakup Induced with Multi-Branch Channels

    Daiki Tanaka, Satsuki Kajiya, Seito Shijo, Dong Hyun Yoon, Masahiro Furuya, Yoshito Nozaki, Hiroyuki Fujita, Tetsushi Sekiguchi, Shuichi Shoji

    Molecules   26 ( 12 ) 3707 - 3707  2021.06  [Refereed]  [International journal]

     View Summary

    In recent years, research on the application of microdroplets in the fields of biotechnology and chemistry has made remarkable progress, but the technology for the stable generation of single-micrometer-scale microdroplets has not yet been established. In this paper, we developed an efficient and stable single-micrometer-scale droplet generation device based on the fragmentation of droplet tails, called “tail thread mode”, that appears under moderate flow conditions. This method can efficiently encapsulate microbeads that mimic cells and chemical products in passively generated single-micrometer-scale microdroplets. The device has a simple 2D structure; a T-junction is used for droplet generation; and in the downstream, multi-branch channels are designed for droplet deformation into the tail. Several 1–2 µm droplets were successfully produced by the tail’s fragmentation; this continuous splitting was induced by the branch channels. We examined a wide range of experimental conditions and found the optimal flow rate condition can be reduced to one-tenth compared to the conventional tip-streaming method. A mold was fabricated by simple soft lithography, and a polydimethylsiloxane (PDMS) device was fabricated using the mold. Based on the 15 patterns of experimental conditions and the results, the key factors for the generation of microdroplets in this device were examined. In the most efficient condition, 61.1% of the total droplets generated were smaller than 2 μm.

    DOI

    Scopus

  • Microstructure, Morphology and Magnetic Property of (001)-Textured MnAlGe Films on Si/SiO<sub>2</sub> Substrate

    Rie Y. Umetsu, Satoshi Semboshi, Yoshifuru Mitsui, Hirokazu Katsui, Yoshito Nozaki, Isamu Yuitoo, Teruaki Takeuchi, Mikiko Saito, Hiroshi Kawarada

    MATERIALS TRANSACTIONS   62 ( 5 ) 680 - 687  2021.05  [Refereed]  [Domestic journal]

     View Summary

    Substrate heating effects on the microstructure and magnetic properties of MnAlGe films grown on Si/SiO2 substrate by sputtering system were investigated. The MnAlGe film fabricated by low-temperature substrate heating demonstrated amorphous phase and paramagnetic property. The film of c-axis orientation associated with the Cu2Sb-type structure was obtained by sputtering at a substrate heating temperature of 270°C and it exhibited perpendicular magnetic anisotropy. From the magnetization curves measured at room temperature, the uniaxial magnetic anisotropy energy, Ku, was evaluated to be in the order of 106 erg/cm3, which is consistent with the literature, although the heating processing and temperature are slightly different. Microstructural observation indicated that the c-axis oriented grains were isolated in the matrix of the amorphous phase. The film lost the c-axis orientation at elevated substrate heating temperature, resulting in loss of the anisotropic magnetic property.

    DOI

  • Development of Microdroplet Generation Method for Organic Solvents Used in Chemical Synthesis

    Shohei Hattori, Chenghe Tang, Daiki Tanaka, Dong Hyun Yoon, Yoshito Nozaki, Hiroyuki Fujita, Takashiro Akitsu, Tetsushi Sekiguchi, Shuichi Shoji

    Molecules   25 ( 22 ) 5360 - 5360  2020.11  [Refereed]  [International journal]

     View Summary

    Recently, chemical operations with microfluidic devices, especially droplet-based operations, have attracted considerable attention because they can provide an isolated small-volume reaction field. However, analysis of these operations has been limited mostly to aqueous-phase reactions in water droplets due to device material restrictions. In this study, we have successfully demonstrated droplet formation of five common organic solvents frequently used in chemical synthesis by using a simple silicon/glass-based microfluidic device. When an immiscible liquid with surfactant was used as the continuous phase, the organic solvent formed droplets similar to water-in-oil droplets in the device. In contrast to conventional microfluidic devices composed of resins, which are susceptible to swelling in organic solvents, the developed microfluidic device did not undergo swelling owing to the high chemical resistance of the constituent materials. Therefore, the device has potential applications for various chemical reactions involving organic solvents. Furthermore, this droplet generation device enabled control of droplet size by adjusting the liquid flow rate. The droplet generation method proposed in this work will contribute to the study of organic reactions in microdroplets and will be useful for evaluating scaling effects in various chemical reactions.

    DOI

  • Microdroplet synthesis of azo compounds with simple microfluidics-based pH control

    Daiki Tanaka, Shunsuke Sawai, Shohei Hattori, Yoshito Nozaki, Dong Hyun Yoon, Hiroyuki Fujita, Tetsushi Sekiguchi, Takashiro Akitsu, Shuichi Shoji

    RSC Advances   10 ( 64 ) 38900 - 38905  2020.10  [Refereed]  [International journal]

     View Summary

    <p>Conventional solution-phase synthesis of azo compounds is complicated by the need for precise pH and temperature control, high concentrations of pH control reagents, and by-product removal. The microdroplet synthesis method has solved these problems.</p>

    DOI

    Scopus

    8
    Citation
    (Scopus)
  • Integration of Horizontal and Vertical Microfluidic Modules for Core-Shell Droplet Generation and Chemical Application

    Dong Hyun Yoon, Yoshito Nozaki, Daiki Tanaka, Tetsushi Sekiguchi, Shuichi Shoji

    Micromachines   10 ( 9 ) 613 - 613  2019.09  [Refereed]  [International journal]

     View Summary

    This paper presents a method for utilizing three-dimensional microfluidic channels fully to realize multiple functions in a single device. The final device structure was achieved by combining three independent modules that consisted of horizontal and vertical channels. The device allowed for the one-step generation of water-in-oil-in-water droplets without the need for partial treatment of the polydimethylsiloxane channel surface using separate modules for generating water-in-oil droplets on the horizontal plane and oil-in-water droplets on the vertical plane. The second vertically structured module provided an efficient flow for the generation of highly wettable liquid droplets, and tuning of the first horizontally structured module enabled different modes of inner-core encapsulation within the oil shell. The successful integration of the vertical and horizontal channels for core-shell droplet generation and the chemical synthesis of a metal complex within the droplets were evaluated. The proposed approach of integrating independent modules will expand and enhance the functions of microfluidic platforms.

    DOI

    Scopus

    4
    Citation
    (Scopus)
  • High-Efficiency Dibromination of Organic Compound in Microfluidic Channel of SI Pillar Array Directly Coated with Iron Catalys

    Takuo Sugaya, Daiki Tanaka, Dong Hyun Yoon, Yoshito Nozaki, Tetsushi Sekiguchi, Takashiro Akitsu, Shuichi Shoji

    2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems &amp; Eurosensors XXXIII (TRANSDUCERS &amp; EUROSENSORS XXXIII)    2019.06  [Refereed]  [International journal]

    DOI

  • Stacked piezoelectric energy harvesting device by printing process

    Yuki Kamata, Dong Hyun Yoon, Toshio Sasaki, Yoshito Nozaki, Shinichi Yamaura, Tetsushi Sekiguchi, Takashi Nakajima, Shuichi Shoji

    Micro &amp; Nano Letters   11 ( 10 ) 650 - 653  2016.10  [Refereed]  [International journal]

    DOI

    Scopus

    5
    Citation
    (Scopus)
  • Fabrication process of fluidic devices for producing fine droplets using a focused ion beam system

    Y. Nozaki, T. Kanai, A. Matsuo, D. Tanaka, I. Yuito, T. Takeuchi, T. Sekiguchi, S. Shoji

    2016 IEEE 16th International Conference on Nanotechnology (IEEE-NANO)    2016.08  [Refereed]  [International journal]

    Authorship:Lead author

    DOI

  • Development of a simple fabrication process for a printable piezoelectric energy harvest device

    Yuki Kamata, Donghyun Yoon, Toshio Sasaki, Yoshito Nozaki, Shinichi Yamaura, Tetsushi Sekiguchi, Takashi Nakajima, Syuichi Shoji

    2016 IEEE 11th Annual International Conference on Nano/Micro Engineered and Molecular Systems (NEMS)    2016.04  [Refereed]  [International journal]

    DOI

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Research Projects

  • -

Presentations

  • A Sub-1 Hz Resonance Frequency MEMS Seismometer with Low Parasitic Coupling

    Jun Wu, Yoshito Nozaki, Hideyuki Maekoba, Arnaud Parent, Tamio Ikehashi

    2022 JSME-IIP/ASME-ISPS Joint International Conference on Micromechatronics for Information and Precision Equipment (MIPE2022)  (Nagoya, Japan) 

    Presentation date: 2022.08

    Event date:
    2022.08
     
     
  • Establishment of Labo-in-a-Microdroplet for Azo Compound Synthesis

    Daiki Tanaka, Shunsuke Sawai, Takuo Sugaya, Yoshito Nozaki, Dong Hyun Yoon, Taisuke Isano, Hitoshi Yamagata, Hiroyuki Fujita, Tetsushi Sekiguchi, Takashiro Akitsu, Shuichi Shoji

    The 23rd International Conference on Miniaturized Systems for Chemistry and Life Sciences (µTAS 2019)  (Basel, Switzerland) 

    Presentation date: 2019.10

    Event date:
    2019.10
     
     
  • Sequential Formation of Daughter Droplets by Breakup of Microdroplets into Bypass Channel

    Shohei Hattori, Dong Hyun Yoon, Yoshito Nozaki, Taisuke Isano, Hitoshi Yamagata, Hiroyuki Fujita, Tetsushi Sekiguchi, Shuichi Shoji

    The 23rd International Conference on Miniaturized Systems for Chemistry and Life Sciences (µTAS 2019)  (Basel, Switzerland) 

    Presentation date: 2019.10

    Event date:
    2019.10
     
     
  • Simultaneous Microdroplets Generation by Tail Breakup Induced with Multi-Branch Channel

    Satsuki Kajiya, Dong Hyun Yoon, Yoshito Nozaki, Taisuke Isano, Hitoshi Yamagata, Hiroyuki Fujita, Tetsushi Sekiguchi, Shuichi Shoji

    The 23rd International Conference on Miniaturized Systems for Chemistry and Life Sciences (µTAS 2019)  (Basel, Switzerland) 

    Presentation date: 2019.10

    Event date:
    2019.10
     
     
  • Construction of a Well-Operable Crystallization Method for Chemical Analysis Applying Microdroplet Device

    S. Hattori, D. Tanaka, D. H. Yoon, T. Sekiguchi, Y. Nozaki, T. Akitsu, S. Shoji

    The 4th Conference on MicroFluidic Handling Systems (MFHS2019)  (Enschede, Netherlands) 

    Presentation date: 2019.10

    Event date:
    2019.10
     
     
  • High-Efficiency Dibromination of Organic Compound in Microfluidic Channel of Si Pillar Array Directly Coated with Iron Catalyst

    Takuo Sugaya, Daiki Tanaka, Dong Hyun Yoon, Yoshito Nozaki, Tetsushi Sekiguchi, Takashiro Akitsu, Shuichi Shoji

    2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems &amp; Eurosensors XXXIII (TRANSDUCERS &amp; EUROSENSORS XXXIII)  (Berlin, Germany) 

    Presentation date: 2019.06

    Event date:
    2019.06
     
     
  • Growth of perpendicularly magnetized Mn-based layered compound thin films on BaTiO3(001)

    Tomoyasu Taniyama, Takamasa Usami, Mitsuru Itoh, Rie Umetsu, Yoshito Nozaki, Isamu Yuito, Teruaki Takeuchi, Hiroshi Kawarada

    International Conference on Materials and Systems for Sustainability 2017 (ICMaSS2017)  (Nagoya, Japan) 

    Presentation date: 2017.09

    Event date:
    2017.09
    -
    2017.10
  • Anisotropic Magnetic Properties and Cr Substitution Effects on the Curie Temperature of MnAlGe Layered Compounds

    Rie Y. Umetsu, Yoshifuru Mitsui, Ji Xia, Hirokazu Katsui, Yoshito Nozaki, Isamu Yuitoo, Teruaki Takeuchi, Tomoyasu Taniyama, Hiroshi Kawarada  [Invited]

    International Conference on Materials and Systems for Sustainability 2017 (ICMaSS2017)  (Nagoya, Japan) 

    Presentation date: 2017.09

    Event date:
    2017.09
    -
    2017.10
  • Fabrication Process of Fluidic Devices for Producing Fine Droplets Using a Focused Ion Beam System

    Y. Nozaki, T. Kanai, A. Matsuo, D. Tanaka, I. Yuito, T. Takeuchi, T. Sekiguchi, S. Shoji

    2016 IEEE 16th International Conference on Nanotechnology (IEEE-NANO)  (Sendai, Miyagi, Japan) 

    Presentation date: 2016.08

    Event date:
    2016.08
     
     
  • Development of a Simple Fabrication Process for a Printable Piezoelectric Energy Harvest Device

    Yuki Kamata, Donghyun Yoon, Toshio Sasaki, Yoshito Nozaki, Shinichi Yamaura, Tetsushi Sekiguchi, Takashi Nakajima, Syuichi Shoji

    The 11th IEEE Annual International Conference on Nano/Micro Engineered and Molecular Systems (NEMS)  (Sendai, Japan) 

    Presentation date: 2016.04

    Event date:
    2016.04
     
     
  • Comparison of insulation characterization of Al2O3 film made by Atomic Layer Depositioon

    Yoshito Nozaki, Tetsushi Sekiguchi, Atsushi Hiraiwa, Hiroshi Kawarada

    27th International Microprocesses and Nanotechnology Conference (MNC 2014)  (Hilton Fukuoka Sea Hawk, Japan) 

    Presentation date: 2014.11

    Event date:
    2014.11
     
     
  • Investigation of Al2O3 film characterization made by Atomic Layer Deposition method

    Yoshito Nozaki, Tetsushi Sekiguchi, Atsushi Hiraiwa, Hiroshi Kawarada

    Presentation date: 2014.09

    Event date:
    2014.09
     
     
  • High-voltage environment-resistive gate insulator for diamond field-effect transistors with two-dimensional hole gas

    A. Hiraiwa, T. Saito, A. Daicho, H. Tsuboi, T. Naruo, Y. Nozaki, H. Kawarada

    International Conference on Diamond and Carbon Materials 2013  (Riva del Garda, Italy) 

    Presentation date: 2013.09

    Event date:
    2013.09
     
     

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