Dielectric relaxation in the nematic and smectic A phases of nPCHB-NCS homologous series

Stanislaw Urban; Eva Novotna; Horst Kresse; Roman S. Dabrowski

doi:10.1117/12.215523

2 August 1995 Dielectric relaxation in the nematic and smectic A phases of nPCHB-NCS homologous series

Stanislaw Urban, Eva Novotna, Horst Kresse, Roman S. Dabrowski

Proceedings Volume 2372, Liquid Crystals: Materials Science and Applications; (1995) https://doi.org/10.1117/12.215523
Event: Liquid Crystals: Materials Science and Applications, 1994, Zakopane, Poland

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.

Citation Download Citation

Stanislaw Urban, Eva Novotna, Horst Kresse, and Roman S. Dabrowski "Dielectric relaxation in the nematic and smectic A phases of nPCHB-NCS homologous series", Proc. SPIE 2372, Liquid Crystals: Materials Science and Applications, (2 August 1995); https://doi.org/10.1117/12.215523

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