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Bifurcation structure and collective motions of a self-propelling droplet driven by surfactant

Research Project

Project/Area Number 21K03855
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 19010:Fluid engineering-related
Research InstitutionKyoto University

Principal Investigator

ICHIKAWA Masatoshi  京都大学, 理学研究科, 講師 (40403919)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2023: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords自己駆動液滴 / アクティブマター / エマルジョン / マイクロスイマー / 細胞運動 / マイクロ流体デバイス / 相分離
Outline of Research at the Start

自己遊泳する液滴やその集団が、自発的対称性の破れや集団運動として顕現させる時空間構造の解明を目指す。動きに関する対称性の破れ(運動の多様化)がどこから創発するのか、この現象に潜む数理的な構造と流体力学的なメカニズムはどの様なものか、実験と理論の両面から解明する。実験によって対流モードの解析を行い、理論モデルとの定量比較を通じて転移現象を解析する。さらに、単独液滴で得られた知見を多数液滴の集団運動や協調的な運動に応用して集団運動での特徴を明らかにする。

Outline of Final Research Achievements

A self-propelled object is an object that exhibits motion driven by internal forces utilizing the energy inherent in the system. In this study, we focus on micrometer sized self-propelled droplets that show translational swimming motion and elucidate the mechanism of their motion transition through both experimental and theoretical approaches. When the droplets are composed of water and oil, a drift transition occurs from a stationary state to a translational motion state accompanied with size increase of the droplet. We have revealed that this translational motion has a stable solution for the straight motion. Additionally, as the droplets become more larger, a bifurcation occurs where the direction of the quadrupole mode of internal and external convection becomes unstable. This instability leads to weak directional stability of the motion against disturbances or perturbations, resulting in curved motion.

Academic Significance and Societal Importance of the Research Achievements

本研究は、細胞サイズのスケールでの液滴が示す遊泳運動の流体力学的特性と駆動対流の安定構造を解明しました。これによって、液滴の運動モードやその安定性が、サイズや物性が変化した際にどのように変わるかのメカニズムが明らかになりました。この知見は、化学反応を利用して自らを動かすアクティブ液滴の運動制御技術への応用面として重要です。さらに、初期の生物がどのような生体分子やメカニズムを利用して細胞運動を獲得したのかは未解明な謎ですが、本研究はそれら初期生物が利用したと考えられる物理学的な要件と、運動の多様性を生み出す最も単純な要素を明らかにしたという観点で、発展的な意義があります。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (33 results)

All 2024 2023 2022 2021 Other

All Journal Article (8 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 8 results,  Open Access: 5 results) Presentation (21 results) (of which Int'l Joint Research: 9 results,  Invited: 4 results) Book (1 results) Remarks (3 results)

  • [Journal Article] Collective Motion of Ciliates the Microswimmers2024

    • Author(s)
      奥山紘平, 市川正敏
    • Journal Title

      Journal of the Society of Powder Technology, Japan

      Volume: 61 Issue: 4 Pages: 204-212

    • DOI

      10.4164/sptj.61.204

    • ISSN
      0386-6157, 1883-7239
    • Year and Date
      2024-04-10
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Role of tubulin C-terminal tail on mechanical properties of microtubule2024

    • Author(s)
      Senjuti Nowroz, Syeda Rubaiya Nasrin, Arif Md Rashedul Kabir, Takefumi Yamashita, Tomoichiro Kusumoto, Junichi Taira, Marie Tani, Masatoshi Ichikawa, Kazuki Sada, Akira Kakugo
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 706 Pages: 149761-149761

    • DOI

      10.1016/j.bbrc.2024.149761

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Growth of self-integrated atomic quantum wires and junctions of a Mott semiconductor2023

    • Author(s)
      Asaba Tomoya、Peng Lang、Ono Takahiro、Akutagawa Satoru、Tanaka Ibuki、Murayama Hinako、Suetsugu Shota、Razpopov Aleksandar、Kasahara Yuichi、Terashima Takahito、Kohsaka Yuhki、Shibauchi Takasada、Ichikawa Masatoshi、Valent? Roser、Sasa Shin-ichi、Matsuda Yuji
    • Journal Title

      Science Advances

      Volume: 9 Issue: 18 Pages: 1-9

    • DOI

      10.1126/sciadv.abq5561

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Motion of a swimming droplet under external perturbations: A model-based approach2022

    • Author(s)
      Saori Suda, Tomoharu Suda, Takuya Ohmura, Masatoshi Ichikawa
    • Journal Title

      Physical Review E

      Volume: 106 Issue: 3

    • DOI

      10.1103/physreve.106.034610

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Simple dynamics underlying the survival behaviors of ciliates2022

    • Author(s)
      Takuya Ohmura, Yukinori Nishigami, Masatoshi Ichikawa
    • Journal Title

      Biophysics and Physicobiology

      Volume: 19 Issue: 0 Pages: n/a

    • DOI

      10.2142/biophysico.bppb-v19.0026

    • ISSN
      2189-4779
    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Straight-to-Curvilinear Motion Transition of a Swimming Droplet Caused by the Susceptibility to Fluctuations2021

    • Author(s)
      Suda Saori、Suda Tomoharu、Ohmura Takuya、Ichikawa Masatoshi
    • Journal Title

      Physical Review Letters

      Volume: 127 Issue: 8

    • DOI

      10.1103/physrevlett.127.088005

    • NAID

      120007141691

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Near-wall rheotaxis of the ciliate Tetrahymena induced by the kinesthetic sensing of cilia2021

    • Author(s)
      Ohmura Takuya、Nishigami Yukinori、Taniguchi Atsushi、Nonaka Shigenori、Ishikawa Takuji、Ichikawa Masatoshi
    • Journal Title

      Science Advances

      Volume: 7 Issue: 43

    • DOI

      10.1126/sciadv.abi5878

    • NAID

      120007166033

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Accumulation of Tetrahymena pyriformis on Interfaces2021

    • Author(s)
      Okuyama Kohei、Nishigami Yukinori、Ohmura Takuya、Ichikawa Masatoshi
    • Journal Title

      Micromachines

      Volume: 12 Issue: 11 Pages: 1339-1339

    • DOI

      10.3390/mi12111339

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Measurement of rheotaxis of ciliates2024

    • Author(s)
      Masatoshi Ichikawa
    • Organizer
      Active Matter Workshop 2024
    • Related Report
      2023 Annual Research Report
  • [Presentation] Emergence of bio mimicry movements of micro swimmers2024

    • Author(s)
      Masatoshi Ichikawa
    • Organizer
      Kyoto Winter School 2024 Towards Holistic Understanding of Life
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 繊毛虫テトラヒメナの懸濁液における気液界面への着脱過程の解析2024

    • Author(s)
      奥山紘平,市川正敏
    • Organizer
      日本物理学会2024年春季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Self-propelled droplets: from model system to living cell2023

    • Author(s)
      Masatoshi Ichikawa
    • Organizer
      International workshop: Complex motile matter from single agents to collective behaviors
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Transition from straight motion to curvilinear motion of swimming droplet2023

    • Author(s)
      Masatoshi Ichikawa
    • Organizer
      Frontiers in nonequilibrium physics: Active matter topology and beyond
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Swimming droplet makes an end to straight motion by increase in size2023

    • Author(s)
      Saori Suda,Tomoharu Suda,Takuya Ohmura,Masatoshi Ichikawa
    • Organizer
      7th International Soft Matter Conference ISMC2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Measurements of motion response and rheotaxis behavior of ciliate Tetrahymena under shear flow in a microfluidic device2023

    • Author(s)
      Masatoshi Ichikawa,Takumi Kobayashi
    • Organizer
      日本流体力学会2023
    • Related Report
      2023 Annual Research Report
  • [Presentation] 遊泳微生物の走流性について実験上の定義を考える2023

    • Author(s)
      市川正敏
    • Organizer
      生物流体力学における境界
    • Related Report
      2023 Annual Research Report
  • [Presentation] Rheotaxis of ciliates2023

    • Author(s)
      Masatoshi Ichikawa
    • Organizer
      Diorama-Ethology Ciliate Workshop
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Mesoscale Dynamics in Condensed Suspensions of Microswimmers2023

    • Author(s)
      Kohei Okuyama
    • Organizer
      Frontiers in nonequilibrium physics: Active matter,topology and beyond
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Mesoscale dynamics in condensed suspensions of microswimmers Tetrahymena pyriformis2023

    • Author(s)
      Kohei Okuyama,Masatoshi Ichikawa
    • Organizer
      28th International Conference on Statistical Physics Statphys28
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Mesoscale dynamics in condensed suspensions of microswimmers Tetrahymena pyriformis2023

    • Author(s)
      Kohei Okuyama,Masatoshi Ichikawa
    • Organizer
      The 7th International Soft Matter Conference ISMC2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 繊毛虫テトラヒメナ懸濁液の気液界面におけるメゾスケールダイナミクス2023

    • Author(s)
      奥山紘平,市川正敏
    • Organizer
      日本物理学会第78回年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Experimental measurement of mesoscale dynamics at air-water interface of suspension of ciliate Tetrahymena2023

    • Author(s)
      Kohei Okuyama,Masatoshi Ichikawa
    • Organizer
      日本流体力学会2023
    • Related Report
      2023 Annual Research Report
  • [Presentation] Self-propelled droplet makes an end of straight swimming by a size effect2022

    • Author(s)
      Masatoshi Ichikawa
    • Organizer
      9th World Congress of Biomechanics (WCB 2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 繊毛虫テトラヒメナの生物対流における個体の遊泳2022

    • Author(s)
      奥山紘平, 市川正敏
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 自己推進液滴が形成するクラスターの規則運動2022

    • Author(s)
      大元隆史, 丸山慶, 市川正敏
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 遊泳微生物テトラヒメナの脈流への応答2022

    • Author(s)
      小林琢実, 市川正敏
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 繊毛虫テトラヒメナの高濃度懸濁液における集団遊泳の解析2022

    • Author(s)
      奥山紘平, 市川正敏
    • Organizer
      2022 年度研究集会「生物流体力学と生物運動」
    • Related Report
      2022 Research-status Report
  • [Presentation] 自己推進液滴が形成するクラスターの運動2022

    • Author(s)
      大元隆史, 丸山慶, 市川正敏
    • Organizer
      2022 年度研究集会「生物流体力学と生物運動」
    • Related Report
      2022 Research-status Report
  • [Presentation] 繊毛虫テトラヒメナの脈流応答2022

    • Author(s)
      小林琢実, 市川正敏
    • Organizer
      2022 年度研究集会「生物流体力学と生物運動」
    • Related Report
      2022 Research-status Report
  • [Book] 京大式サイエンスの創り方: 狙ってもできないことがある2022

    • Author(s)
      京都大学大学院理学研究科MACS教育プログラム実行委員会 (編集)
    • Total Pages
      317
    • Publisher
      京都大学学術出版会
    • ISBN
      4814004087
    • Related Report
      2022 Research-status Report
  • [Remarks] 市川正敏のWEBページ

    • URL

      https://chem.scphys.kyoto-u.ac.jp/ichikawa/

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
  • [Remarks] 泳ぐ水滴はなぜ直進しないのか?

    • URL

      https://www.kyoto-u.ac.jp/ja/research-news/2021-08-23-1

    • Related Report
      2021 Research-status Report
  • [Remarks] 泳ぐ微生物が海まで流されない理由 -SDGsに欠かせない小さな生物たちの振る舞いを解明-

    • URL

      https://www.kyoto-u.ac.jp/ja/research-news/2021-10-21-0

    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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