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Proceedings Paper

Electro-optical investigation of nematic liquid crystals using dielectrometry
Author(s): Aleksandar Andonovski; Margarita Ginovaska
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Paper Abstract

An investigation is carried on two samples of nematic liquid crystals (NLC), products of 'Merck' - Germany ZLI-1800-000 with (Delta) (epsilon) > 0 and ZLI-4788-000 with (Delta) (epsilon) < 0. Method of dielectrometry is used for measurements in nematic phase of these liquid crystals. Parallel and perpendicular components of dielectric constants (epsilon) (parallel) and (epsilon) (perpendicular) are determined for different temperatures and frequencies from 5 Hz to 10 MHz of applied field. Changes of dielectric anisotropy versus frequency are presented, according to frequency-dispersion of dielectric constants and their imaginary and real components are obtained. Debye's and Coul-Coul diagrams are constructed for given frequencies only for the first LC caused by the low frequency dispersion for (epsilon) (parallel). Physical properties and accurate values of clearing point are obtained from measurements of temperature dependence of dielectric constants.

Paper Details

Date Published: 14 December 1999
PDF: 8 pages
Proc. SPIE 4017, Polymers and Liquid Crystals, (14 December 1999); doi: 10.1117/12.373714
Show Author Affiliations
Aleksandar Andonovski, St. Cyril and Methodius Univ. (Republic of Macedonia)
Margarita Ginovaska, St. Cyril and Methodius Univ. (Republic of Macedonia)

Published in SPIE Proceedings Vol. 4017:
Polymers and Liquid Crystals
Andrzej Wlochowicz, Editor(s)

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