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Numerical study on ferroelectric nematic liquid crystal of rod molecules

Research Project

Project/Area Number 21K03486
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 13040:Biophysics, chemical physics and soft matter physics-related
Research InstitutionKyoto University

Principal Investigator

Araki Takeaki  京都大学, 理学研究科, 准教授 (20332596)

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: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords強誘電性ネマチック相 / 全原子分子動力学シミュレーション / 分子モデリング / 強誘電性ネマチック液晶 / 分子動力学シミュレーション / 強誘電性液晶 / ネマチック液晶
Outline of Research at the Start

強誘電性液晶とは強誘電性を持つ液晶相である。期待される有用性から多くの研究がなされてきたが、スメクチックC*相を用いた例はあるものの、一般的な実用化には至っていないのが現状である。本研究課題は、数値シミュレーションと理論解析を用いて、対称性の高い強誘電性液晶相、すなわち長軸方向に分極を持つ棒状分子による強誘電性ネマチック相の開発を目指す。これまでの研究により、棒状分子の中央付近を嵩張らせることで、ネマチック相が強誘電性を持つ可能性があることが分かっている。これを発展させ強誘電性液晶相形成の証拠を見つけるとともに、その物理的機構を明らかにしたい。また、その知見をもとに分子設計の指針を与えたい。

Outline of Final Research Achievements

We study the physical mechanism of ferroelectric nematic phase by means of quantum chemical calculation and all-atom molecular dynamics simulation. By simulating systems containing 1000 to 2000 molecules of the DIO molecule, we confirmed the spontaneous generation of ferroelectric order. When we performed calculations on DIO molecular systems without charge for comparison, we found that ferroelectric order did not manifest, indicating the contribution of electrostatic interactions to the manifestation of this phase. However, it was found that the contribution of the charge distribution along the molecular long axis alone could not explain the ferroelectric order. Detailed investigation of intermolecular correlation functions revealed that components of the charge distribution perpendicular to the molecular long axis, which are not usually considered, contribute to the manifestation of ferroelectric order.

Academic Significance and Societal Importance of the Research Achievements

強誘電性液晶とは強誘電性を示す液晶相であり、期待される有用性から多くの研究がなされてきた。一方近年、西川らやMandleらによって主軸方向に分極を持つ強誘電性ネマチック相の存在を示唆する実験結果が報告された。しかしながら、その物理機構については分からないことが多く、早急な解明が望まれている。我々の研究は、強誘電秩序の発生において分子の形状はあまり重要ではなく、電荷の分布、特に長軸に垂直な成分の相関が重要な寄与を及ぼすことを明らかにした。この知見は今後の分子モデリングに対し極めて有用であると考えている。

Report

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

    (17 results)

All 2023 2022 2021 Other

All Int'l Joint Research (3 results) Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (13 results) (of which Int'l Joint Research: 7 results,  Invited: 1 results)

  • [Int'l Joint Research] Durham University(英国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] マックスプランク研究所(ドイツ)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Uナシオナル・アウトノマ・デ・メキシコ大学(メキシコ)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Relaxation to steady states of a binary liquid mixture around an optically heated colloid2022

    • Author(s)
      Araki Takeaki、Gomez-Solano Juan Ruben、Maciolek Anna
    • Journal Title

      Physical Review E

      Volume: 105 Issue: 1 Pages: 014123-014123

    • DOI

      10.1103/physreve.105.014123

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Atomistic simulations of ferroelectric nematic liquid crystals: microscopic behavior and properties2023

    • Author(s)
      Matheus de Mello and Takeaki Araki
    • Organizer
      The 7th International Soft Matter Conference ISMC2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Analysis of Lebwohl-Lasher model with randomness2023

    • Author(s)
      Rei Amano and Takeaki Araki
    • Organizer
      The 7th International Soft Matter Conference ISMC2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Johari-Goldstein relaxation mode in ionic glass CKN2023

    • Author(s)
      Takeaki Araki and Makina Saito
    • Organizer
      9th International Discussion Meeting on Relaxations in Complex Systems
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Effect of closed loop structure of diblock copolymer on nanoscale phase-separated pattern2023

    • Author(s)
      Dai Matsubara and Takeaki Araki
    • Organizer
      The 7th International Soft Matter Conference ISMC2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Fractal and Chain Structure of Colloidal gels2023

    • Author(s)
      Koichi Hirata and Takeaki Araki
    • Organizer
      The 7th International Soft Matter Conference ISMC2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Johari-Goldstein relaxation in model glass systems2023

    • Author(s)
      Takeaki Araki and Makina Saito
    • Organizer
      The 7th International Soft Matter Conference ISMC2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 金属錯体DNAの温度安定性2023

    • Author(s)
      岡本光・荒木武昭
    • Organizer
      日本物理学会第78回年次大会
    • Related Report
      2022 Research-status Report
  • [Presentation] エアロゲルの粗視化モデルにおける、変形に対する構造変化2023

    • Author(s)
      平田光一・荒木武昭
    • Organizer
      日本物理学会第78回年次大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 相互作用にランダム性を組み込んだ液晶相転移の解析2023

    • Author(s)
      天野玲・荒木武昭
    • Organizer
      日本物理学会第78回年次大会
    • Related Report
      2022 Research-status Report
  • [Presentation] イオンガラスのJohari-Goldstein緩和に関する数値シミュレーション2022

    • Author(s)
      荒木武昭・齋藤真器名
    • Organizer
      第10回ソフトマター研究会
    • Related Report
      2022 Research-status Report
  • [Presentation] イオンガラスCKNのJohari-Goldstein緩和に関する数値シミュレーション2022

    • Author(s)
      荒木武昭・齋藤真器名
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] コロイドゲルのトポロジー2022

    • Author(s)
      平田光一・荒木武昭
    • Organizer
      日本物理学会2022年秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] A simple molecular model showing ferroelectric nematic order2021

    • Author(s)
      Takeaki Araki and Sayane Hattori
    • Organizer
      Optics of Liquid Crystal 2023
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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

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