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Amphiphilic molecular assemblies worked by a chemical potential gradient with micro scale

Research Project

Project/Area Number 19K15425
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 28050:Nano/micro-systems-related
Research InstitutionOsaka Prefecture University (2020-2021)
Doshisha University (2019)

Principal Investigator

Okita Erika  大阪府立大学, 工学(系)研究科(研究院), 助教 (60803161)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsアクティブマター / ソフトマター / コロイド / ベシクル / pH勾配 / 化学走性 / 自律運動 / 等温系
Outline of Research at the Start

従来の化学プロセスがシステムの維持のためにマクロなポテンシャル勾配を必要とするのに対し、生物は等温系で化学反応から直接仕事を得て機能している。本研究では、等温系において化学走性機能を持つ分子集合体システムの創製にとって必要最小限の物理的要素の解明を目指す。そのモデル系として低pH領域に向かう両親媒性分子集合体を簡単な人工系で構築し、数理モデルを用いて化学走性が能動輸送機能に与える影響を検討する。また、分子集合体の周囲のpH勾配やpHを独立に変えることで、pH勾配下における分子集合体の自律運動に必要な駆動力の熱力学的な発生機構を理解する。このように、化学走性機能の解明と応用への知見を得る。

Outline of Final Research Achievements

For the purpose of active transport of substances at the microscale, vesicles consisting of cationic surfactants soluble in acidic solutions and complexes of cationic surfactants and water droplets formed by the two-phase separation of two polymer solutions were prepared as transport carriers and their behaviors under pH gradients were observed. The vesicles deformed and the droplets translated with directionality along the pH gradient. These movements may be driven by the difference in interfacial tension before and after the carriers. A mathematical model of carrier motion was developed based on directionality, and it was found that increasing the intensity of movement of a carrier in one direction by about 10% reduced the arrival time of the object by a factor of 2-10 compared to a randomly moving carrier.

Academic Significance and Societal Importance of the Research Achievements

ミクロな物体の周囲に生じた化学的性質の揺らぎ(濃度勾配など)によって引き起こされる物体の指向的な変形や移動による物質の能動的輸送を実現するために必要な知見として、輸送キャリアの普遍的な物理化学的特徴や作製のための方法論の獲得につながった。このような研究は今後、生体内などのミクロなスケールにおける物質の送達や回収を目的とした研究につながると考えられる。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (5 results)

All 2021 2020 2019

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results)

  • [Journal Article] A Molecular Assembly Machine Working under a Quasi-Steady State pH Gradient2020

    • Author(s)
      Nawa-Okita Erika、Nakao Yuki、Yamamoto Daigo、Shioi Akihisa
    • Journal Title

      Bulletin of the Chemical Society of Japan

      Volume: 93 Issue: 4 Pages: 604-610

    • DOI

      10.1246/bcsj.20190348

    • NAID

      130007831645

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Biomimetic motions of acid/soap vesicles under pH gradients2021

    • Author(s)
      Erika Okita
    • Organizer
      Pacifichem 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] pH勾配を感知して自律運動をおこなうオレイン酸系ベシクルの運動メカニズム2020

    • Author(s)
      沖田愛利香
    • Organizer
      第19回反好会講演会
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] Driving force of vesicle with autonomous motion under a quasi-steady state pH gradient2019

    • Author(s)
      Nawa Erika、Nakao Yuki、Yamamoto Daigo、Shioi Akihisa
    • Organizer
      OKINAWA COLLOIDS 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Acid/soap vesicle working under a quasi-steady state pH gradient2019

    • Author(s)
      Nawa Erika、Nakao Yuki、Yamamoto Daigo、Shioi Akihisa
    • Organizer
      18th Asian Pacific Confederation of Chemical Engineering Congress (APCChE 2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2023-01-30  

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