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Formation Mechanism of Triply Periodic Minimal Surface as a Thermodynamic Equilibrium Structure

Research Project

Project/Area Number 15350110
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Functional materials/Devices
Research InstitutionUniversity of Tsukuba (2004-2005)
Osaka University (2003)

Principal Investigator

SAITO Kazuya  University of Tsukuba, Graduate School of Pure and Applied Sciences, Professor, 大学院・数理物質科学研究科, 教授 (30195979)

Co-Investigator(Kenkyū-buntansha) MIYAZAKI Yuji  Osaka University, Graduate School of Science, Research Associate, 大学院・理学研究科, 助手 (70252575)
Project Period (FY) 2003 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥15,500,000 (Direct Cost: ¥15,500,000)
Fiscal Year 2005: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2004: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2003: ¥12,700,000 (Direct Cost: ¥12,700,000)
KeywordsSoft Matter / Minimal Surface / Liquid Crystal / Heat Capacity / Entropy / キュービック液晶 / モノオレイン / 三重周期極小曲面 / 高分子
Research Abstract

Thermodynamic and structural study was conducted on thermotropic and lyotropic liquid crystals paying special attention on why so complex structures closely related to triply periodic minimal surfaces (TPMS) are spontaneously formed. Smaller heat capacity than neighboring liquid crystalline phases is common to TPMS-related cubic phases both in thermotropic and lyotropic systems. This trend can be understood by considering the suppressed fluctuation due to three-dimensional connectivity of TPMS. The analysis of the phase transition entropy between lamellar (smectic) and cubic phases suggests the possible construction of "thermodynamics" on the basis of "surfaces", where a unit cell of cubic phase would play a role of a basic unit. Appearance of plural cubic phases depending on the alkyl chain length was proved through putting a new example, BABH series. On the basis of the alkyl chain length dependence of the reflection intensities from a cubic phase having Ia3d symmetry (gyroid phase), the aggregation structure at the molecular level was, for the first time, revealed. The ends of alkyl chain of BABH molecules are located on the gyroid while the molecular cores aggregated to form a "jungle gym" consisting of rod-like aggregates. This aggregation mode survives even if the volume of the alkyl chain becomes larger than that of the molecular core. This is in a strong contrast to the cases of block copolymer and lyotropic liquid crystals, where the aggregation mode changes into the inverse phase. In the region where their volumes are roughly equal to each other, the other cubic phase with Im3m symmetry appears commonly in BABH and ANBC. This suggests that the clarification of the molecular aggregation mode in this Im3m phase and of its stability would be a key to solve the issue how different are low-weight thermotropic system from lyotropic system and block copolymers, in both of which physical surface can easily be imagined.

Report

(4 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • 2003 Annual Research Report
  • Research Products

    (16 results)

All 2006 2005 2004 Other

All Journal Article (13 results) Publications (3 results)

  • [Journal Article] Cubic Phase of 4'-n-Hexadecyloxy-3'-cyanobiphenyl-4-carboxylic Acid(ACBC-16)2006

    • Author(s)
      S.Kutsumizu, K.Saito, S.Nojima, M.sorai, Y.G.Gakyametdinov, I.galyametdionova, R.Eidenschink, W.Haase
    • Journal Title

      Liq.Cryst. 33(1)

      Pages: 75-84

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Two cubic Phaases of 1,2-Bis(4'-n-alkoxybenzoyl) hydrazines)BABH-n)2006

    • Author(s)
      H.Mori, S.Kutsumizu, T.Ito, M.fukatami, K.Saito, K.Sakajiri, K.Moriya
    • Journal Title

      Chem.Lett. 35(4)

      Pages: 362-363

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] サーモトロピック液晶における双連結構造2006

    • Author(s)
      沓水祥一, 齋藤一弥
    • Journal Title

      固体物理 41(6)

      Pages: 379-388

    • NAID

      40007356878

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Cubic Phase of 4'-n-Hexadecyloxy-3'-cyanobiphenyl- 4-carboxylic Acid (ACBC-16)2006

    • Author(s)
      S.Kutsumizu, K.Saito, S.Nojima, M.Sorai, Y.G.Galyametdinov, I.Galyametdinova, R.Eidenschink, W.Haase
    • Journal Title

      Liq.Cryst. 33 (1)

      Pages: 75-84

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Two Cubic Phases of 1,2-Bis(4'-n-alkoxybenzoyl) hydrazines (BABH-n)2006

    • Author(s)
      H.Mori, S.Kutsumizu, T.Ito, M.Fukatami, K.Saito, K.Sakajiri, K.Moriya
    • Journal Title

      Chem.Lett. 35 (4)

      Pages: 362-363

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Bicontinuous Structures in Thermotropic Liquid Crystals (review in Japanese)2006

    • Author(s)
      S.Kutsumizu, K.Saito
    • Journal Title

      Kotai Butsuri (Solid State Physics) 41 (6)

      Pages: 379-388

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Cubic Phase of 4'-n-Hexadecyloxy-3'-cyanobiphenyl-4-carboxylic Acid (ACBC-16)2006

    • Author(s)
      S.Kutsumizu, 他7名
    • Journal Title

      Liq.Cryst. 33・1

      Pages: 75-84

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Two Cubic Phases of 1,2-Bis(4'-n-alkoxybenzoyl)hydrazines (BABH-n)2006

    • Author(s)
      H.Mori, 他6名
    • Journal Title

      Chem.Lett. 35(印刷中)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Molecular Dynamics and Residual Entropy in the Soft Crystal, SmE Phase, of 4-Butyl 4'-isothiocyano-1,1'-biphenyl2005

    • Author(s)
      S.Ishimaru, 他4名
    • Journal Title

      J.Phys.Chem.B 109・20

      Pages: 10020-10024

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Phase Separation Behavior of Aqueous Solutions of a Thermoresponsive Polymer2005

    • Author(s)
      Y.Matsuda, 他5名
    • Journal Title

      J.Polym.Sci.B : Polym.Phys. 43

      Pages: 2937-2949

    • Related Report
      2005 Annual Research Report
  • [Journal Article] サーモトロピック液晶とリオトロピック液晶-統一的視点の可能性-2005

    • Author(s)
      齋藤一弥
    • Journal Title

      熱測定 32・3

      Pages: 133-140

    • NAID

      10029865157

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Alkyl Group as Entropy Reservoir in an MMX Chain Complex, Pt_2(n-PenCS_2)_4I2005

    • Author(s)
      K.Saito, 他7名
    • Journal Title

      J.Phys.Chem.B 109・7

      Pages: 2956-2961

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Thermodynamic Study on a Chiral Glass-Former, 4-(1-Methylheptyloxy)-4'-cyanobiphenyl (8^*OCB)2004

    • Author(s)
      K.Saito, 他8名
    • Journal Title

      J.Phys.Chem.B 108・18

      Pages: 5785-5790

    • Related Report
      2004 Annual Research Report
  • [Publications] K.Saito, N.Kitamura, M.Sorai: "Thermodynamic Study of Phase Transitions in Lyotropic Systems : Adiabatic Calorimetry on Non-Ionic Surfactant C16E8-Water System"J.Phys.Chem.B. 107・31. 7854-7860 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Y.Maeda, K.Saito, M.Sorai: "Phase Behavior of the Thermotropic Cubic Mesogen 1,2-Bis(4-n octyloxybenzoyl)hydrazine under Pressure"Liq.Cryst.. 30・10. 1139-1149 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Yoshiba, A.Teramoto, N.Nakamura, K.Kikuchi, Y.Miyazaki, M.Sorai: "Static Water Structure Detected by Heat Capacity Measurements on Aqueous Solutions of a Triple-Helical Polysaccharide Schizophyllan"Biomacromolecules. 4・5. 1348-1356 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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