Optical Studies of Pretransitional Surface Ordering and Disordering in Liquid Crystals
作者:
T. Moses,
Y.R. Shen,
Ping Sheng,
Bo-Zang Li,
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: 85-92
ISSN:1058-725X
年代: 1992
DOI:10.1080/15421409208048242
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The Landau-deGennes theory predicts interesting pretransitional surface behavior at the interface between a liquid crystal and a smooth or rough substrate. In the former case, we propose a simple form for the liquid crystal-substrate interaction which yields enhanced surface ordering in the nematic and a uniaxial-biaxial transition in the isotropic phase. For the experimentally accessible range of liquid crystal-substrate interaction strengths, the experimentally observed pretransitional behavior in the isotropic phase is in excellent agreement with the theory. For the case of a rough substrate, pretransitional surface disordering in the nematic is predicted and measured directly by evanescent-wave ellipsometry, while pretransitional random-planar surface ordering occurs in the isotropic phase.
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