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Clarification of the mechanisms of rotation and dissipative structure in chiral liquid crystals by variational principle

Research Project

Project/Area Number 18K13520
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 13040:Biophysics, chemical physics and soft matter physics-related
Research InstitutionRitsumeikan University

Principal Investigator

Yoshioka Jun  立命館大学, 理工学部, 助教 (50708542)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords液晶 / 非平衡現象 / 変分原理 / 非平衡 / 散逸構造 / ソフトマター
Outline of Final Research Achievements

We found that director deformation, rotation and self-excited oscillation phenomena were induced in liquid crystalline droplets under the existence of temperature gradient or electric field. Under these situations, director and flow fields in the droplets were measured with polarized and confocal microscopy and fluorescence photobleaching method. On the basis of these experimental results, we designed simplified models for the phenomena, and theoretically analyzed them by using the Onsager’s variational principle. This analysis indicated that the mechanisms of the above phenomena are well described by the interaction between the director and the flow fields in the liquid crystal.

Academic Significance and Societal Importance of the Research Achievements

液晶滴における一連の非平衡現象の機構解析において、オンサーガーの変分原理が有効に機能することが示された。具体的な実験事例の解析における有効性が明示されたことで、この理論の妥当性、有用性が支持されたと言える。本研究のような具体的な事例への適用を重ねていくことで、今後オンサーガーの変分原理は、複雑な非平衡現象一般を解析する有効な手法として、広く普及していくことが期待される。これは、非平衡現象の機構理解という現代物理学が抱える大課題に対して、ブレイクスルーを与え得ると私は確信している。

Report

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

    (13 results)

All 2021 2020 2019 2018

All Journal Article (4 results) (of which Peer Reviewed: 4 results) Presentation (9 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results)

  • [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] Differential rotation in cholesteric pillars under a temperature gradient2020

    • Author(s)
      Jun Yoshioka and Fumito Araoka
    • Journal Title

      Scientific Reports

      Volume: 10 Issue: 1 Pages: 172261-10

    • DOI

      10.1038/s41598-020-73024-0

    • 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
      2019 Research-status Report
    • Peer Reviewed
  • [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
  • [Presentation] 直流電場下の液晶滴におけるマルタ十字組織の変形・輸送現象2021

    • Author(s)
      吉岡 潤、 深尾 浩次
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 直流電場下のネマチック液晶滴における対流駆動と構造変形2020

    • Author(s)
      吉岡 潤、 深尾 浩次
    • Organizer
      2020年 日本液晶学会 オンライン研究発表会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 温度勾配下のコレステリック液晶滴におけるリミットサイクル振動2020

    • Author(s)
      吉岡 潤、 深尾 浩次
    • Organizer
      日本物理学会第75回年次大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 温度勾配下のコレステリック液晶滴における配向の非線形振動2019

    • Author(s)
      吉岡 潤、 深尾 浩次
    • Organizer
      2019年日本液晶学会討論会
    • Related Report
      2019 Research-status Report
  • [Presentation] 液晶滴内のマランゴニ対流が駆動する配向の自励振動2019

    • Author(s)
      吉岡 潤、 深尾 浩次
    • Organizer
      第9回ソフトマター研究会
    • Related Report
      2019 Research-status Report
  • [Presentation] Horizontal transportation of a Maltese-cross pattern in liquid crystalline droplets under temperature gradient2019

    • Author(s)
      Jun Yoshioka, Koji Fukao
    • Organizer
      4th Asian Conference on Liquid Crystals
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 温度勾配下の液晶滴におけるマルタ十字組織の水平輸送2019

    • Author(s)
      吉岡 潤、 深尾 浩次
    • Organizer
      第74回物理学会年次大会
    • Related Report
      2018 Research-status Report
  • [Presentation] 水平温度勾配下のネマチック液晶滴における対流駆動と散逸構造2018

    • Author(s)
      吉岡 潤、 深尾 浩次
    • Organizer
      2018年液晶学会討論会
    • Related Report
      2018 Research-status Report
  • [Presentation] Convective flow and dissipative structure in liquid crystalline droplets under temperature gradient2018

    • Author(s)
      Jun Yoshioka, Koji Fukao
    • Organizer
      9th Italian-Japanese Workshop on Liquid Cryatals
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2018-04-23   Modified: 2022-01-27  

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