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Scientific exploration of ferroelectric liquid matter: elusidation of physical/chemical features and its functional application

Research Project

Project/Area Number 19K15438
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 29010:Applied physical properties-related
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

Nishikawa Hiroya  国立研究開発法人理化学研究所, 創発物性科学研究センター, 特別研究員 (50835519)

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: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2020: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2019: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Keywords強誘電性ネマチック / フェロネマチック / 巨大分極 / トポロジー / フォトコンデンサ / キャパシタ / 極性らせん構造 / アゾベンゼン / 光変調 / 極性ネマチック / 強誘電 / 分極反転 / 誘電率 / 光変調素子 / ネマチック / 自発分極
Outline of Research at the Start

近年、申請者が開発した極性ネマチックは史上初の強誘電流体である。通常、液体は自発分極を保持できないため強誘電性を示さない。このパラドックスを液晶の観点から実験的アプローチにより明確化することで、強誘電リキッドマターの創成とその特性を活かしたユニークな機能性の探求・応用を目指す。具体的には、1)偏光顕微鏡、非線形光学による直接観察から流動と誘起トポロジー/誘起分極の相関の理解、2) 極性ネマチックのせん断に伴う時間平均化した誘電率評価による分極量評価。3) (1)、(2)で得られた知見をもとにした強誘電発現メカニズムの解明。さらに、強誘電リキッドマターの探究ならびにそれを用いた素子開発を目指す。

Outline of Final Research Achievements

By focusing on unique features, i.e. fluidity, topology and polarization, of ferroelectric nematic material (NF), I successfully create a polar helix and a novel device using the gigantic polarization of NF. I demonstrate that in the polar helix, the local nematic director is non-degenerated, that is, the head-and-tail symmetry is broken, and electrically/quickly inter-convertibility of selective reflection related to the half-/full-pitch bands in the distorted helix. On the other hand, I develop a novel device a.k.a. a photo-condenser by just blending NF and a photo-trigger with visible light responsivity. I demonstrate that in the photo-condenser, the reversible trans-cis isomerization of the photo-trigger under blue (415 nm) and green (525 nm) light irradiation causes a switch between two liquid-crystalline phases that exhibit drastic tuning of dielectric permittivities (200 < ε < 18,000), with a rapid response time (< 30 s) and excellent reversibility (~ 100 cycles).

Academic Significance and Societal Importance of the Research Achievements

巨大分極特性(誘電率、自発分極)に加え高い流動性をもつユニークな性質を伴う強誘電性ネマチック(NF)材料は国内外で多くの関心を集めている。本研究では、NF材料において、流動性・トポロジー・分極の相互関係と強誘電発現起源の相関理解に取り組み、極性トポロジーが織り成す新規構造(極性らせん構造)の創製・機能評価や、巨大分極特性を利用した革新的機能性マテリアル(フォトコンデンサ)の創製に成功した。本成果により、NF材料は既存材料の常識を覆すポテンシャルをもつことを実証した。強誘電発現起源のさらなる深化により、NF材料の自在設計が可能となり、学術分野ならびに産業分野全体に波及効果をもたらすと確信する。

Report

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

    (9 results)

All 2022 2021 2020 2019

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 3 results,  Invited: 2 results) Patent(Industrial Property Rights) (2 results)

  • [Journal Article] Anisotropic fluid with photo tunable dielectric permittivity2022

    • Author(s)
      Hiroya Nishikawa, Koki Sano, Fumito Araoka
    • Journal Title

      Nature Communications

      Volume: 13 Issue: 1 Pages: 1-9

    • DOI

      10.1038/s41467-022-28763-1

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A New Class of Chiral Nematic Phase with Helical Polar Order2021

    • Author(s)
      Hiroya Nishikawa, Fumito Araoka
    • Journal Title

      Advanced Materials

      Volume: 33 Issue: 35 Pages: 1-9

    • DOI

      10.1002/adma.202170270

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Polymorphic Structures and Characteristics of Nematic-Based Ferronematics2021

    • Author(s)
      Hiroya Nishikawa, Fumito Araoka
    • Organizer
      The 28th International Display Workshops (IDW’21)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Nematic-based ferronematics exhibiting gigantic dielectric permittivity2021

    • Author(s)
      Hiroya Nishikawa, Hirotsugu Kikuchi
    • Organizer
      Materials Research Meeting 2021 (MRM2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Photovariable Capacitor with Enormous Capacitance Tunability Realized by A Polar Nematic Fluid2021

    • Author(s)
      Hiroya Nishikawa, Koki Sano, Fumito Araoka
    • Organizer
      Optics in Liquid Crystal Conference 2021 (OLC2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 強誘電ネマチック材料の魅力的な特徴と直近展開2021

    • Author(s)
      西川浩矢、荒岡史人
    • Organizer
      2021年日本液晶学会討論会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 10^4~10^2もの劇的な誘電率変化を可能とする光応答性N混合液晶2019

    • Author(s)
      西川浩矢
    • Organizer
      日本液晶学会討論会
    • Related Report
      2019 Research-status Report
  • [Patent(Industrial Property Rights)] 誘電体材料及びキャパシタ2021

    • Inventor(s)
      荒岡史人、西川浩矢
    • Industrial Property Rights Holder
      荒岡史人、西川浩矢
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2020-137063
    • Filing Date
      2021
    • Related Report
      2021 Annual Research Report
  • [Patent(Industrial Property Rights)] 誘電体材料及びキャパシタ2020

    • Inventor(s)
      西川浩矢、荒岡史人
    • Industrial Property Rights Holder
      西川浩矢、荒岡史人
    • Industrial Property Rights Type
      特許
    • Filing Date
      2020
    • Related Report
      2020 Research-status Report

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

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