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Dynamical heterogeneity and critical Casimir effect

Research Project

Project/Area Number 18K18740
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 13:Condensed matter physics and related fields
Research InstitutionRitsumeikan University

Principal Investigator

Fukao Koji  立命館大学, 理工学部, 教授 (50189908)

Project Period (FY) 2018-06-29 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2019: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2018: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywordsカシミール力 / 動的不均一性 / 液晶滴 / 欠陥構造 / 回転運動 / レーザーピンセット / コレステリック液晶 / レーザートラップ / 液滴 / マランゴニ対流 / 高分子薄膜 / コロイド / 蛍光退色回復法 / マイクロレオロジー / カシミール効果 / ガラス転移
Outline of Final Research Achievements

At the beginning the purpose of this study was to elucidate the correlation between the critical Casimir force applied to colloid particles in the critical concentration of the polymer blends and the dynamical heterogeneity of glass dynamics. However, the research done in the first period of this project clarified the difficulty in detecting the tiny Casimir force applied to colloid particles via laser tweezer. Hence, we have changed our target from colloid particles to liquid crystal droplets and we obtained the following two results: 1) For Cholesteric liquid crystal droplets, the competition between isotropic elasticity and molecular orientation at the interface can induce the various types of defect structure. The stability of the defect structure has been successfully elucidated. 2) From the analysis of structural change under temperature gradient to liquid crystal droplets with point defects, we could observe the twist and rotational motion of the internal director field.

Academic Significance and Societal Importance of the Research Achievements

当初想定した結果には到達していないが、液晶滴に対して得られた結果は、アクティブマターの特徴を理解するために不可欠なものである。アクティブマターは私たちの生活に密接に関わっている物質群を構成し、またこれまでに未解明の非線形・非平衡に関連した基礎的な物理現象をもたらすものとも言える。したがって、本研究のこれまでの結果は、私たちの生活に直接関わる科学に大きく貢献する可能性があり、学術的・社会的に十分な意義を有する。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (15 results)

All 2021 2020 2019 2018

All Journal Article (10 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 10 results) Presentation (5 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results)

  • [Journal Article] Polymerization-Induced Vitrification and Kinetic Heterogenization at the Onset of the Trommsdorff Effect2021

    • Author(s)
      Suzuki Yasuhito、Shinagawa Yuya、Kato Eri、Mishima Ryutaro、Fukao Koji、Matsumoto Akikazu
    • Journal Title

      Macromolecules

      Volume: 54 Issue: 7 Pages: 3293-3303

    • DOI

      10.1021/acs.macromol.0c02260

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spectroscopic analysis in molecular simulations with discretized Wiener-Khinchin theorem for Fourier-Laplace transformation2020

    • Author(s)
      Koyama Akira、Nicholson David A.、Andreev Marat、Rutledge Gregory C.、Fukao Koji、Yamamoto Takashi
    • Journal Title

      Physical Review E

      Volume: 102 Issue: 6 Pages: 063302-063302

    • DOI

      10.1103/physreve.102.063302

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Horizontal Transportation of a Maltese Cross Pattern in Nematic Liquid Crystalline Droplets under a Direct-Current Electric Field2020

    • Author(s)
      Yoshioka Jun、Fukao Koji
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 89 Issue: 9 Pages: 094401-094401

    • DOI

      10.7566/jpsj.89.094401

    • NAID

      40022344798

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Self-excited oscillation of the director field in cholesteric liquid crystalline droplets under a temperature gradient2020

    • Author(s)
      Jun Yoshioka, Koji Fukao
    • Journal Title

      J. Phys.: Condens. Matter

      Volume: 32 Issue: 32 Pages: 325102-325102

    • DOI

      10.1088/1361-648x/ab83b1

    • Related Report
      2020 Annual Research Report 2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Relaxation behavior of poly(diisopropyl fumarate) including no methylene spacer in the main chain2020

    • Author(s)
      Yasuhito Suzuki, Kairi Miyata, Masashi Sato, Nagisa Tsuji, Koji Fukao, Akikazu Matsumoto
    • Journal Title

      Polymer

      Volume: 196 Pages: 122479-122479

    • DOI

      10.1016/j.polymer.2020.122479

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Electrorheological Properties of Dual Frequency Liquid Crystal in Smectic A Phase2019

    • Author(s)
      Matsuoka Narumi、Kaneko Kosuke、Kaneko Kimiyoshi、Takikawa Yoshinori、Fukao Koji、Hanasaki Tomonori
    • Journal Title

      Chemistry Letters

      Volume: 48 Issue: 4 Pages: 386-389

    • DOI

      10.1246/cl.181023

    • NAID

      130007624443

    • ISSN
      0366-7022, 1348-0715
    • Year and Date
      2019-04-05
    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Direct observation of mobility of thin polymer layers via asymmetric interdiffusion using neutron reflectivity measurements2019

    • Author(s)
      Megumi Ooe, Kairi Miyata, Jun Yoshioka, Koji Fukao, Fumiya Nemoto, and Norifumi L. Yamada
    • Journal Title

      Journal of Chemical Physics

      Volume: 151 Issue: 24 Pages: 244905-244905

    • DOI

      10.1063/1.5132768

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Processing Pathways Decide Polymer Properties at the Molecular Level2019

    • Author(s)
      S. Chandran, J. Baschnagel, D. Cangialosi, K. Fukao, E. Glynos, L.M.C. Janssen, M. Mueller, M. Muthukumar, U. Steiner, J. Xu, S. Napolitano, G. Reiter
    • Journal Title

      Macromolecules

      Volume: 52, Issue: 19 Pages: 7146-7156

    • DOI

      10.1021/acs.macromol.9b01195

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Horizontal transportation of a Maltese cross pattern in nematic liquid crystalline droplets under a temperature gradient2019

    • Author(s)
      Yoshioka Jun、Fukao Koji
    • Journal Title

      Physical Review E

      Volume: 99 Issue: 2 Pages: 022702-022702

    • DOI

      10.1103/physreve.99.022702

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Origin of SAXS intensity in the low-q region during the early stage of polymer crystallization from both the melt and glassy state2018

    • Author(s)
      Konishi Takashi、Okamoto Daisuke、Tadokoro Daisuke、Kawahara Yoshitaka、Fukao Koji、Miyamoto Yoshihisa
    • Journal Title

      Physical Review Materials

      Volume: 2 Issue: 10

    • DOI

      10.1103/physrevmaterials.2.105602

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] ポリフマル酸ジイソプロピル系高分子の誘電緩和2020

    • Author(s)
      宮田 海里,木村 光輔,深尾 浩次,鈴木 祥仁,松本 章一
    • Organizer
      第69回高分子討論会
    • Related Report
      2020 Annual Research Report
  • [Presentation] ポリアミド系共重合体の電極分極過程の観察2020

    • Author(s)
      岩井 勇樹,宮田 海里,深尾 浩次,Sotta Paul,Long Didier R.
    • Organizer
      第69回高分子討論会
    • Related Report
      2020 Annual Research Report
  • [Presentation] ナノ細孔中でのイオン液晶の相転移2020

    • Author(s)
      藤本 大輔,宮田 海里,深尾 浩次
    • Organizer
      第69回高分子討論会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Interdiffusion and glass transition in thin polymer films2019

    • Author(s)
      K.Fukao, M.Ooe, T.Hayashi, K.Miyata, J.Yoshioka, F.Nemoto, N.L.Yamada
    • Organizer
      Princeton center conference: Polymers at the Nanoscale:: Phase transition and dynamics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Asymmetric interfacial dynamics and glass transition in stacked thin polymer fillms2018

    • Author(s)
      Koji Fukao
    • Organizer
      10th Conference on Broadband Dielectric Spectroscopy and its Applications,
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2018-07-25   Modified: 2022-01-27  

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