Polar and quadrupolar order in smectic liquid crystals
作者:
P. SCHILLER,
H. SCHLACKEN,
期刊:
Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 24,
issue 4
页码: 619-626
ISSN:0267-8292
年代: 1998
DOI:10.1080/026782998207109
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
In several smectic phases the long molecules are tilted towards the layer planes. The molecules in the layers of smectic C phases have a preferred tilt direction with a C2 rotation axis perpendicular to the tilt plane. If the molecules have a brick-like shape, a configuration possessing the D2h symmetry is also possible. For molecules shaped like chevrons or bananas, the existence of a smectic phase with the symmetry Cv was recently reported. We consider different in-plane configurations of smectics using a geometrical approach based on the 'scaled particle theory'. Varying the geometrical parameters of hard rod particles, a phase diagram for several smectic configurations is predicted. Depending on the particle shape, phases with dipolar order (C2,Cv) and quadrupolar order (D2h) can be stable.
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