Degree of disorder in cubic mesophases in thermotropics: Thermodynamic study of a liquid crystal showing two cubic mesophases

Kazuya Saito, Takashi Shinhara, Tadahiro Nakamoto, Shoichi Kutsumizu, Yano, and Michio Sorai
Phys. Rev. E 65, 031719 – Published 6 March 2002
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Abstract

Heat capacity of a thermotropic mesogen ANBC(22) (4-alkoxy-3-nitrobiphenyl-4-carboxylic acid with 22 carbon atoms in alkyl chain) showing two cubic mesophases was measured by adiabatic calorimetry between 13 and 480 K. Excess enthalpies and entropies due to phase transitions were determined. A small thermal anomaly due to the cubic Im3mcubicIa3d phase transition was successfully detected. Through an analysis of chain-length dependence of the entropy of transition, the sequence of two cubic mesophases (with space groups Ia3d and Im3m) is deduced for thermotropic mesogens ANBC(n). It is shown that the disorder of the core arrangement decreases in the order of SmCcubic(Im3m)cubic(Ia3d) while that of the chain in the reverse order cubic (Ia3d)cubic(Im3m)SmC.

  • Received 13 June 2001

DOI:https://doi.org/10.1103/PhysRevE.65.031719

©2002 American Physical Society

Authors & Affiliations

Kazuya Saito1,*, Takashi Shinhara1, Tadahiro Nakamoto1, Shoichi Kutsumizu2,†, Yano3, and Michio Sorai

  • 1Research Center for Molecular Thermodynamics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
  • 2Instrumental Analysis Center, Gifu University, Gifu 501-1193, Japan
  • 3Faculty of Engineering, Gifu University, Gifu 501-1193, Japan

  • *Corresponding author.
  • Present address: Faculty of Engineering, Gifu University.

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Vol. 65, Iss. 3 — March 2002

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