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Proceedings Paper

Dielectric relaxation in the nematic and smectic A phases of nPCHB-NCS homologous series
Author(s): Stanislaw Urban; Eva Novotna; Horst Kresse; Roman S. Dabrowski
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Paper Abstract

Dielectric relaxation studies are reported of several substances belonging to the homologous series of 4-isothiocyanatophenyl 4-(trans-4-alkylcyclohexyl) benzoates (nPCHB-NCS) which exhibit the nematic (N) and smectic A(SmA) polymorphism. From the relaxation times (tau) (parallel) characterizing molecular reorientations around the short axes the activation enthalpies (Delta) H(parallel) for both phases were calculated. It was found that (Delta) H(parallel)(N) is markedly larger than (Delta) H(parallel)(SmA). The effect is interpreted on the basis of existing models of smectic A phase.

Paper Details

Date Published: 2 August 1995
PDF: 8 pages
Proc. SPIE 2372, Liquid Crystals: Materials Science and Applications, (2 August 1995); doi: 10.1117/12.215523
Show Author Affiliations
Stanislaw Urban, Jagellonian Univ. (Poland)
Eva Novotna, Martin Luther Univ. (Germany)
Horst Kresse, Martin Luther Univ. (Germany)
Roman S. Dabrowski, Military Univ. of Technology (Poland)

Published in SPIE Proceedings Vol. 2372:
Liquid Crystals: Materials Science and Applications
Jozef Zmija, Editor(s)

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