Alignment and alignment dynamics of nematic liquid crystals on Langmuir-Blodgett mono-layers
作者:
V. S. U. FAZIO,
L. KOMITOV,
S. T. LAGERWALL,
期刊:
Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 24,
issue 3
页码: 427-433
ISSN:0267-8292
年代: 1998
DOI:10.1080/026782998207253
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Mono-layers of stearic and behenic acids, deposited with the Langmuir-Blodgett technique, were used as aligning films in nematic liquid crystal cells. During the filling process the liquid crystal adopts a deformed quasi-planar alignment with splay-bend deformation and preferred orientation along the filling direction. This state is metastable and transforms with time into a homeotropic state once the flow has ceased. The transition is accompanied by formation of disclination lines which nucleate at the edges of the cell. The lifetime of the metastable splay-bend state was found to depend on the cell thickness. On heating, an anchoring transition from quasi-homeotropic to degenerate tilted alignment in the form of circular domains takes place near the transition to the isotropic phase. The anchoring transition is reversible with a small hysteresis.
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