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Proceedings Paper

Liquid crystalline systems with twist-grain boundary phases
Author(s): Nonna L. Kramarenko; Viktor I. Kulishov; Lidiya A. Kutulya; Natalya I. Shkolnikova
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Paper Abstract

The phase diagrams of the liquid crystalline systems which consisted of the achiral ester mesogen (the eutectic mixture of 4-n-hexyloxyphenyl 4-n-octyloxybenzoate and 4-n- octyloxyphenyl 4-n-hexyloxybenzoate) and the structurally similar chiral dopants are studied. The S-1-phenyl- and S-1-benzylethylamine N-arylidene derivatives including the ester group in arylidene fragment are used as chiral dopants. The twist grain boundary (TGB) region occurs in all investigated systems. This phase state is proved by small angle x-ray scattering and helical pitch measurements. The TGB states on the SmA side (TGBA) and SmC* side (TGBc) have different structure according to x-ray analysis data. The chiral dopants capacity for (theta) c smectic tilt angle decreasing is considered as an important factor of the TGB state formation in the liquid crystalline systems investigated. The chiral dopant structure peculiarities influence the TGB phase topology and the phase boundary slopes. The boundaries of the TGBc region are more sensitive to chiral dopants concentration changes in comparison with the TGBA boundaries.

Paper Details

Date Published: 29 April 1996
PDF: 9 pages
Proc. SPIE 2795, Nonlinear Optics of Liquid and Photorefractive Crystals, (29 April 1996); doi: 10.1117/12.239192
Show Author Affiliations
Nonna L. Kramarenko, Institute for Single Crystals (Ukraine)
Viktor I. Kulishov, Institute of Physics (Ukraine)
Lidiya A. Kutulya, Institute for Single Crystals (Ukraine)
Natalya I. Shkolnikova, Institute for Single Crystals (Ukraine)

Published in SPIE Proceedings Vol. 2795:
Nonlinear Optics of Liquid and Photorefractive Crystals
Gertruda V. Klimusheva; Andrey G. Iljin, Editor(s)

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