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Proceedings Paper

Dielectric characterization of different homologous compounds forming smectic B phases
Author(s): Heiko Schmalfuss; Horst Kresse
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Paper Abstract

The first seven members of homologous N-(4-n- hexyloxybenzylidene)-4-n-alkylanilines were synthesized, purified and characterized by calorimetric and dielectric measurements during cooling. There are phase transitions between high temperature phases (nematic, smectic A) and the solid-like smectic modifications B and G characterized by different transition entropies and different steps for the relaxation times which can be related to each other. Furthermore a change of sign of the dielectric anisotropy with increasing number of carbon atoms in the alkyl chain was detected. There is also a strong dependence of the activation energies for the reorientation about the short molecular axis on the temperature range of the nematic phase.

Paper Details

Date Published: 12 May 2000
PDF: 5 pages
Proc. SPIE 4147, Liquid Crystals: Chemistry, Physics, and Applications, (12 May 2000); doi: 10.1117/12.385687
Show Author Affiliations
Heiko Schmalfuss, Martin-Luther-Univ. Halle-Wittenberg (Germany)
Horst Kresse, Martin-Luther-Univ. Halle-Wittenberg (Germany)

Published in SPIE Proceedings Vol. 4147:
Liquid Crystals: Chemistry, Physics, and Applications

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