Investigation of alignment mechanism of liquid crystal on polyimide Langmuir-Blodgett films by scanning tunnelling microscopy
作者:
J.Y. Fang,
Z.H. Lu,
G.W. Min,
Y. Wei,
期刊:
Liquid Crystals
(Taylor Available online 1993)
卷期:
Volume 14,
issue 6
页码: 1621-1626
ISSN:0267-8292
年代: 1993
DOI:10.1080/02678299308027701
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The homogeneous alignment of a liquid crystal material, 4′-n-octyl-4-cyanobiphenyl (8CB), was achieved by polyimide Langmuir-Blodgett (LB) films. Scanning electron microscopy and scanning tunnelling microscopy measurements show that the alignment of the polyimide LB films with a grooveless surface occurs due to the orientation of the polyimide chains. We directly observe 8CB monolayers on oriented polyimide LB films. We find that the monolayers form a two dimensional crystalline structure and the 8CB molecules are always aligned along the chain direction of the polyimide. The results show that the alignment of 8CB molecules arises by an epitaxial growth on the oriented polyimide LB films.
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