Determining the anchoring strength in a capillary using topological defects
作者:
RANDALL D. KAMIEN,
THOMAS R. POWERS,
期刊:
Liquid Crystals
(Taylor Available online 1997)
卷期:
Volume 23,
issue 2
页码: 213-216
ISSN:0267-8292
年代: 1997
DOI:10.1080/026782997208460
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
We consider a smectic A* phase in a capillary with surface anchoring that favours parallel alignment. If the bulk phase of the smectic is the standard twist-grain-boundary phase of chiral smectics, then there will be a critical radius below which the smectic will not have any topological defects. Above this radius a single screw dislocation in the centre of the capillary will be favoured. Along with surface anchoring, a magnetic field will also suppress the formation of a screw dislocation. In this note, we calculate the critical field at which a defect is energetically preferred as a function of the surface anchoring strength and the capillary radius. Experiments at a few different radii could thus determine the anchoring strength.
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