Surface Transition in a Nematic Layer with Reverse Pretilt
作者:
Lachezar Komitov,
SvenT. Lagerwall,
Ameia Sparavigna,
Bengt Stebler,
Alfredo Strigazzi,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1992)
卷期:
Volume 223,
issue 1
页码: 197-217
ISSN:1058-725X
年代: 1992
DOI:10.1080/15421409208048252
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Recently, a surface induced transition from homeotropic to planar alignment in a nematic layer and the corresponding optical response has been reported/K. Flatischler, L. Komitov, S. T. Lagerwall, B. Stebler, and A. Strigazzi, Mol. Cryst. Liq. Cryst.,198, 119 (1991)/. In the case of surface conditions with reverse pretilt a similar transition from quasi-homeotropic bent alignment to quasi-planar splayed state can be obtained. As known, these two states are topologically incompatible, and therefore the transition is accompanied by nucleation of π-disclination lines, and even is reversible, it exhibits a big hysteresis. Moreover, it can be driven not only by temperature but also by an applied electric field, using a nematic with negative dielectric anisotropy. A simple theoretical description of such an alignment transition is presented.
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