Electro-optical investigation of nematic liquid crystals using dielectrometry

Aleksandar Andonovski; Margarita Ginovaska

doi:10.1117/12.373714

14 December 1999 Electro-optical investigation of nematic liquid crystals using dielectrometry

Aleksandar Andonovski, Margarita Ginovaska

Proceedings Volume 4017, Polymers and Liquid Crystals; (1999) https://doi.org/10.1117/12.373714
Event: International Conference on Dielectric and Related Phenomena '98, 1998, Szczyrk, Poland

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.

Citation Download Citation

Aleksandar Andonovski and Margarita Ginovaska "Electro-optical investigation of nematic liquid crystals using dielectrometry", Proc. SPIE 4017, Polymers and Liquid Crystals, (14 December 1999); https://doi.org/10.1117/12.373714

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