TAKAGI Koki

Affiliation

Institute for Multidisciplinary Sciences

Job Title

Specially Appointed Assistant Professor

Research Fields, Keywords

Electric propulsion, Electrospray Thruster, Ionic liquid, Soft matter engineering, electrochemistry, modeling

Web Site

https://takao-lab.ynu.ac.jp/

Other URL

https://orcid.org/0009-0004-0418-4019 （ORCID）



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The Best Research Achievement in Research Career 【 display / non-display 】

  • 【Published Thesis】 Ion Dynamics in Porous Emitter Ionic Liquid Electrospray Thrusters(Journal of Evolving Space Activities)  2026.04

    【Published Thesis】 Variability trend and geometry effect of a single emitter on ion emission in passively fed porous ionic liquid electrospray thrusters(Journal of Physics D: Applied Physics)  2025.10

    【Published Thesis】 Simple model of multi-scale and multi-site emissions for porous ionic liquid electrospray thrusters(Journal of Applied Physics)  2024.06

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The Best Research Achievement in the last 5 years 【 display / non-display 】

  • 【Published Thesis】 Ion Dynamics in Porous Emitter Ionic Liquid Electrospray Thrusters(Journal of Evolving Space Activities)  2026.04

    【Published Thesis】 Variability trend and geometry effect of a single emitter on ion emission in passively fed porous ionic liquid electrospray thrusters(Journal of Physics D: Applied Physics)  2025.10

    【Published Thesis】 Simple model of multi-scale and multi-site emissions for porous ionic liquid electrospray thrusters(Journal of Applied Physics)  2024.06

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Profile 【 display / non-display 】

  • My research focuses on understanding and controlling ion transport in soft matter, including ionic liquids. Through theoretical modeling and numerical analysis, I investigate ion emission mechanisms for low-power spacecraft electric propulsion.

    I received my Ph.D. in Engineering from Yokohama National University in March 2026. I was a JSPS Research Fellow (DC2, April 2025-March 2026) and a JSPS Research Fellow (PD, April-September 2026, hosted by Prof. Kazuhide Ueno at Yokohama National University). Since October 2026, I have been a Specially Appointed Assistant Professor in the Research Unit of Aeronautics and Astronautics, Institute for Multidisciplinary Sciences, Yokohama National University, hosted by Prof. Yoshinori Takao. I have also been a NEDO Front-runner since April 2026.

    From April 2023 to March 2025, I taught Mechanical Engineering Experiments I and II as a part-time lecturer at Yokohama National University.

    Memberships: The Electrochemical Society of Japan; Ionic Liquid Research Association, Japan; American Institute of Aeronautics and Astronautics (AIAA); Japan Society for Aeronautics and Space Sciences (JSASS).

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Education 【 display / non-display 】

  • 2023.4
    -
    2026.3

    Yokohama National University   Department of Mechanical Engineering, Materials Science, and Ocean Engineering   Doctor Course   Completed

  • 2021.4
    -
    2023.3

    The University of Tokyo   Department of Aeronautics and Astronautics   Master Course   Completed

  • 2017.4
    -
    2021.3

    Tokyo Metropolitan University   Department of Aeronautics and Astronautics   Graduated

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Degree 【 display / non-display 】

  • Doctor of Engineering - Yokohama National University

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Campus Career 【 display / non-display 】

  • 2026.10
    　
    　

    Duty   Yokohama National UniversityInstitute for Multidisciplinary Sciences   Specially Appointed Assistant Professor  

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Academic Society Affiliations 【 display / non-display 】

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Research Areas 【 display / non-display 】

  • Informatics / Computational science  / Computational fluid dynamics simulation

  • Nanotechnology/Materials / Organic functional materials  / Ionic Liquid

  • Nanotechnology/Materials / Polymer chemistry  / Ionic Liquid

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Fluid engineering  / Microfluidics

  • Frontier Technology (Aerospace Engineering, Marine and Maritime Engineering) / Aerospace engineering  / Electric Propulsion

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Papers 【 display / non-display 】

  • Evaluation of AMU as an Ionic Liquid for Multi-Mode Propulsion Using a Porous Ionic Liquid Electrospray Thruster

    Yoshito Arakaki, Koki Takagi, Yusuke Yamashita, Yoshinori Takao, Ryudo Tsukizaki

    Journal of Evolving Space Activities   4   268   2026.6  [Reviewed]

    DOI

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    Language：English   Publishing type：Research paper (scientific journal)   Joint Work  

  • Ion Dynamics in Porous Emitter Ionic Liquid Electrospray Thrusters

    Koki TAKAGI, Ryudo TSUKIZAKI, Yoshinori TAKAO

    Journal of Evolving Space Activities   4   239   2026.4  [Reviewed]

    DOI

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Joint Work  

  • Variability trend and geometry effect of a single emitter on ion emission in passively fed porous ionic liquid electrospray thrusters

    Koki Takagi, Ryudo Tsukizaki, Yoshinori Takao

    Journal of Physics D: Applied Physics   58 ( 44 )   445504   2025.10  [Reviewed]

    DOI

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Joint Work  

  • Simple model of multi-scale and multi-site emissions for porous ionic liquid electrospray thrusters

    Koki Takagi, Yusuke Yamashita, Ryudo Tsukizaki, Kazutaka Nishiyama, Yoshinori Takao

    Journal of Applied Physics   135 ( 24 )   244502   2024.6  [Reviewed]

    DOI

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Joint Work  

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Awards 【 display / non-display 】

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Presentations 【 display / non-display 】

  • Ionic Liquids for Space Propulsion Devices

    Koki Takagi

    PNU-YNU International Bilateral Workshop 2026  2026.8  Advanced Chemical Energy Research Center (ACERC), Institute of Advanced Sciences, Yokohama National University

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    Event date： 2026.8

    Language：English   Presentation type：Symposium, workshop panel (nominated)  

    Venue：Central Library Media Hall, Yokohama National University, Yokohama   Country：Japan  

    A talk given at the bilateral workshop between Pusan National University (PNU) and Yokohama National University (YNU), hosted by the Advanced Chemical Energy Research Center (ACERC). For an audience of battery and electrochemistry researchers, electric propulsion was introduced as an electrochemical device that converts electric energy into kinetic energy, and the operating principle of ionic liquid electrospray thrusters was explained through its analogy with batteries (electric double layer, quasi-neutral bulk, and transport-limited current). Experimental results were reported: current-voltage characteristics, direct high-speed microscope observation of the meniscus at the emitter tip, and ion beam composition measured by the time-of-flight method. 15-minute talk with 5-minute Q&A, in English.

  • Validation of ion emission model for actively fed porous ionic liquid electrospray thrusters

    Koki Takagi, Ryudo Tsukizaki, Yoshinori Takao

    10th Edition of the space propulsion conference  2026.5 

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    Event date： 2026.5

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Bari   Country：Italy  

  • 多孔質エミッタイオン液体エレクトロスプレースラスタにおける圧力制御の重要性

    髙木公貴, 月崎竜童, 鷹尾祥典

    第65回航空原動機・宇宙推進講演会  2026.3  日本航空宇宙学会

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    Event date： 2026.3

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：別府   Country：Japan  

  • 圧力変化が多孔質イオン液体エレクトロスプレースラスタのイオン放出に与える影響

    髙木公貴, 月崎竜童, 鷹尾祥典

    令和7年度 宇宙輸送シンポジウム  2026.1 

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    Event date： 2026.1

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：JAXA宇宙科学研究所   Country：Japan  

  • Effect of Feed Pressure on Ion Emissions from Porous Ionic Liquid Electrospray Thrusters

    Koki Takagi, Ryudo Tsukizaki, Yoshinori Takao

    39th edition of the International Electric Propulsion Conference  2025.9  Electric Rocket Propulsion Society

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    Event date： 2025.9

    Language：English   Presentation type：Oral presentation (general)  

    Venue：London   Country：United Kingdom  

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