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1988 Fiscal Year Final Research Report Summary

Molecular Theoretical Studies on Surface Tension and Molecular Orientation in Liquid Crystals

Research Project

Project/Area Number 61550012
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Applied materials
Research InstitutionNagoya University

Principal Investigator

HATSUO KIMURA  School of Engineering,Nagoya University,Professor, 工学部, 教授 (60023032)

Project Period (FY) 1986 – 1988
KeywordsSurface tension / Molecular orientation at interface / Molecular theory of liquid crystals / Intermolecular forces / Nematic-isotropic interface / スメクチック液晶 / ネマチック一等方相界面 / 平滑面固体基板壁
Research Abstract

The surface tensions of the nematic liquid crystal are calculated molecular theoratically in mean field approximation at (a)the free surface, (b)the nematic-isotropic (N-I) interface, and (c)the wall of a hard flat material. The liquid crystal is assumed to be the system of hard rod-like molecules.The results express the surface tensions as functions of the nematic director and the molecular orientational order parameter,and each expression consists of respective contributions from (1) the attractive intermolecular force and (2) the excluded volume effect due to the hard core repulsions. It is found that the excluded volume effect favours the normal alignment of molecules at the free surface, While it favours the planar orientation at the N-I interface and on the hard flat wall.
On the other hand,the attractive force,depending on the coupling constants for each molecule,favours one of the normal,tilted and planar orientations irrespective of the kind of interface. On the basis of the theory, many experiments such as the followings are analysed and consistently explained as interplay of the repulsive and attractive forces. (1) Many kind of nematic molecules orient normally at the free surface and planarly on hard walls, (2) the orientation of MBBA and EBBA molecules at the free surface changes continuously from normal to tilted wten the temperature is decreased, (3) the molecular orientation of 70CB and of mixtures of 8CD and 80CB on hard flat wall changes from planar to normal likely as the first order phase transition with the decrease of temperature.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 木村初男: 高分子論文集. 43. 177-183 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hatsuo Kimura.;Huzio Nakano: J.Phys.Soc.Jpn.55. 4186-4193 (1986)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 木村初男: 精密工学会誌. 54. 1023-1028 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Yamashita.;H.Kimura: Mol.Cryst.Liq.Cryst.165. 213-232 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kimura: Proc.2nd Yukawa International Seminar. (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Kimura: Mol.Cryst.Liq.Cryst.(1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中野藤生、木村初男: "相転移の統計熱力学" 朝倉書店, 200 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 木村初男: "構造相転移と液晶(物理学最前線)" 共立出版, 63 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hatsuo Kimura: "Molecular Orientation at Interfaces of Nematic Liquid Crystals" Kobunsi Ronbunshu. 43. 177-183 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hatsuo Kimura;Huzio Nakano: "Statistical Theory of Surface Tension an Molecular Orientation in Nematic liquid Crystals.II.The Nematic-Isotropic Interface" J.Phys.Soc.Jpn.55. 4186-4193 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Yamashita;H.Kimura: "Phase Transitions and Solitons in Liquid Crystals" Mol.Cryst.Liq.Cryst.165. 213-232 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kimura: "Can Rod-Like Molecules Form Smectic Phase Without Attractive Forces" Proc.2nd Yukawa International Seminar in Press. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kimura: "Statistical Theory of Molecular Orientational Transitions at Interfaces of Liquid Crystals" Mol.Cryst.Liq.cryst.to be published. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Kimura: Structural Phase Transitions and liquid Crystals. Kyoritu Syuppan, 63 (1988)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1990-03-20  

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