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Proceedings Paper

Antiferroelectric liquid crystals studied by DSC, electro-optic, and dielectric methods
Author(s): M. Marzec; A. Fafara; S. Wrobel; Malgorzata Godlewska; Roman S. Dabrowski; Krzysztof L. Czuprynski; Wolfgang Haase
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Paper Abstract

Thermal properties of four liquid crystalline substances exhibiting antiferroelectric SmCA* and ferroelectric SmC* phases were studied using differential scanning calorimetry, texture observation, electrooptic measurements and dielectric spectroscopy. The measurements were performed both on heating and cooling of the samples. All four substances studied in this work are characterized by a complex polymorphism. The temperatures of phase transitions and enthalpy changes associated with them were determined. The transition from the liquid crystalline to the crystalline state showed significant hysteresis for all four substances studied. Textures observations and electrooptic measurements were performed using ITO cells having thickness from 6 to 10 micrometers . The measurements of spontaneous polarization were performed by means of reversal current method. Spontaneous polarization was measured for a few frequencies of the triangular voltage applied. Temperature dependencies of spontaneous polarization have been studied as a function of the side chain structure.

Paper Details

Date Published: 12 May 2000
PDF: 6 pages
Proc. SPIE 4147, Liquid Crystals: Chemistry, Physics, and Applications, (12 May 2000); doi: 10.1117/12.385664
Show Author Affiliations
M. Marzec, Jagiellonian Univ. (Poland)
A. Fafara, Jagiellonian Univ. (Poland)
S. Wrobel, Jagiellonian Univ. (Poland)
Malgorzata Godlewska, Jagiellonian Univ. (Poland)
Roman S. Dabrowski, Military Univ. of Technology (Poland)
Krzysztof L. Czuprynski, Military Univ. of Technology (Poland)
Wolfgang Haase, Darmstadt Univ. of Technology (Germany)

Published in SPIE Proceedings Vol. 4147:
Liquid Crystals: Chemistry, Physics, and Applications
Stanislaw J. Klosowicz; Jolanta Rutkowska; Jerzy Zielinski; Jozef Zmija, Editor(s)

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