Dielectric characterization of different homologous compounds forming smectic B phases

Heiko Schmalfuss; Horst Kresse

doi:10.1117/12.385687

12 May 2000 Dielectric characterization of different homologous compounds forming smectic B phases

Heiko Schmalfuss, Horst Kresse

Proceedings Volume 4147, Liquid Crystals: Chemistry, Physics, and Applications; (2000) https://doi.org/10.1117/12.385687
Event: XIII International Conference on Liquid Crystals: Chemistry, Physics, and Applications, 1999, Krynica Zdroj, Poland

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.

Citation Download Citation

Heiko Schmalfuss and Horst Kresse "Dielectric characterization of different homologous compounds forming smectic B phases", Proc. SPIE 4147, Liquid Crystals: Chemistry, Physics, and Applications, (12 May 2000); https://doi.org/10.1117/12.385687

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