Twist grain boundary states in non-chiral smectogen-chiral dopant
作者:
N. L. KRAMARENKO,
V. I. KULISHOV,
L. A. KUTULYA,
G. P. SEMENKOVA,
V. P. SEMINOZHENKO,
N. I. SHKOLNIKOVA,
期刊:
Liquid Crystals
(Taylor Available online 1997)
卷期:
Volume 22,
issue 5
页码: 535-541
ISSN:0267-8292
年代: 1997
DOI:10.1080/026782997208910
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The liquid crystalline systems studied consisted of non-chiral mesomorphic esters [the eutectic mixture of 4-n-hexyloxyphenyl 4-n-octyloxybenzoate and 4-n-octyloxyphenyl 4-n-hexyloxybenzoate] and structurally similar chiral dopants (N-arylidene derivatives of S-1-phenyl- and S- 1-benzyl-ethylamine). Twist grain boundary phases occur between the cholesteric and smectic C* or smectic A phases in all the investigated systems. The different structures of these TGB phases (TGBA and TGBC) are proved by small angle X-ray scattering and textural studies. The concentration and temperature ranges of the TGB phases are defined by the twisting power of the chiral dopants and their own mesomorphic peculiarities. The experimental dependences of TGB phase temperature range on cholesteric helical twist are influenced by a ratio change of the optically active and racemic forms of the dopant at a constant total concentration. The results obtained are discussed within Renn's theory.
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