PMID: 11909093Mar 23, 2002Paper

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

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Kazuya SaitoMichio Sorai

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 Im3m-->cubic Ia3d 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 Sm-C-->cubic (Im3m)-->cubic (Ia3d) while that of the chain in the reverse order cubic (Ia3d)-->cubic (Im3m)-->Sm C.

References

Nov 1, 1988·Physical Review A: General Physics·P UklejaM E Neubert
Apr 24, 2002·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·U S Schwarz, G Gompper

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Citations

Jul 23, 2004·The Journal of Chemical Physics·N YamazakiT Ohta
Jan 9, 2016·Physical Chemistry Chemical Physics : PCCP·Kazuya SaitoShoichi Kutsumizu
Jan 29, 2003·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Michio Sorai, Kazuya Saito
Jan 9, 2003·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Catherine EvenMichèle Veber
Jan 19, 2012·Chemical Communications : Chem Comm·Suguru MiisakoKoichi Sakajiri
Jan 25, 2014·Physical Chemistry Chemical Physics : PCCP·Yoji MaedaShinichi Sakurai
Mar 9, 2006·Chemical Reviews·Michio SoraiYuji Miyazaki
Jul 21, 2006·The Journal of Physical Chemistry. B·Kazuya SaitoMichio Sorai
Mar 6, 2003·Journal of the American Chemical Society·Shoichi KutsumizuRyuichi Akiyama

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