FT-IR study of liquid crystal molecules on alignment layers
作者:
Eriko Matsui,
Keiichi Nito,
Akio Yasuda,
期刊:
Liquid Crystals
(Taylor Available online 1994)
卷期:
Volume 17,
issue 3
页码: 311-322
ISSN:0267-8292
年代: 1994
DOI:10.1080/02678299408036572
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Alignment control at the molecular level is crucial for realizing high-performance LCDs. In particular, the structure of the interface between the liquid crystal and the alignment layer must be clarified. By utilizing RAS (reflection-absorption spectroscopy), a highly sensitive FT-IR spectroscopic technique, we have obtained the following information about the orientation of liquid crystal molecules; (1) the cyano group in a liquid crystal molecule behaves like an electron donor with respect to an SiO layer, but like an electron acceptor with respect to a polyimide layer; (2) with the use of polarized IR spectroscopy, it was discovered that the liquid crystal 8CB is aligned with a slant away from the aligning direction, regardless of the type of alignment layer. The angle between the molecular short axis within the plane of the core and the surface normal was found to be smaller on polyimide layers than on SiO layers.
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