Surface Uniformity and Induced Surface Pretilt for PTFE Alignment Layers
作者:
Garry Lester,
Harry Coles,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 312,
issue 1
页码: 13-22
ISSN:1058-725X
年代: 1998
DOI:10.1080/10587259808042427
出版商: Taylor & Francis Group
关键词: PTFE films;surface treatment;pretilt angle;liquid crystal alignment
数据来源: Taylor
摘要:
Suitably deposited thin films of poly (tetrafluoroethylene) (PTFE) will induce alignment in a liquid crystal [1]. These films are deposited in a one step dry process which offers advantages over polyimide or SiO2alignment layer application [2]. Previous studies of such films [3, 4] have shown the quality of liquid crystal alignment to be good and to exhibit an induced surface pretilt of the order of 1°. The relationship between the conditions under which the films are deposited, the uniformity of the deposited film and the induced surface pretilt induced by these surfaces has been investigated further. The uniformity has been studied by observation of the surface tension and the pretilt studied using a modified version of the crystal rotation method. There would appear to be a relationship between the observed uniformity of the surface, the alignment quality and the induced pretilt observed. The data are consistent with the hypothesis that the induced surface pretilt observed is due to irregularities in the structure of the surface.
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