Effect of an electric field on defects in a nematic liquid crystal with variable surface anchoring

Kumar, Arun T.; Sastry, V.S.S.; Ishikawa, Ken; Takezoe, Hideo; Madhusudana, N.V.; Dhara, Surajit

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4160

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DC Field	Value	Language
dc.contributor.author	Kumar, Arun T.	-
dc.contributor.author	Sastry, V.S.S.	-
dc.contributor.author	Ishikawa, Ken	-
dc.contributor.author	Takezoe, Hideo	-
dc.contributor.author	Madhusudana, N.V.	-
dc.contributor.author	Dhara, Surajit	-
dc.date.accessioned	2011-09-21T11:13:12Z	-
dc.date.available	2011-09-21T11:13:12Z	-
dc.date.issued	2011-08	-
dc.identifier.citation	Liquid Crystals, 2011, Vol.38, p971	en
dc.identifier.issn	0267-8292	-
dc.identifier.issn	1366-5855 (online)	-
dc.identifier.uri	http://hdl.handle.net/2289/4160	-
dc.description	Restricted Access.	en
dc.description.abstract	We report experimental studies on defects in a nematic liquid crystal with negative dielectric anisotropy mounted in a cell with perfluoropolymer-coated surfaces. The sample exhibits a discontinuous anchoring transition from planar to homeotropic on cooling at zero or a small electric field, and above a cross-over voltage a continuous ‘inverse Freedericksz transition’, at which the director starts tilting in opposite directions at the two surfaces. Defects of strength ±1/2 are either annihilated or expelled when the director tilts. On the other hand, disclination lines of ±1 which end in partial point defects (boojums) at the surfaces in the planar alignment regime acquire point defects of strength ±1 at the midplane of the cell when the director tilts. At a low enough temperature, the homeotropic anchoring becomes strong, and an electric field above the Freedericksz threshold generates the usual umbilic defects, which follow the dynamic scaling laws found in earlier studies.	en
dc.language.iso	en	en
dc.publisher	Taylor & Francis	en
dc.relation.uri	http://dx.doi.org/10.1080/02678292.2011.587962	en
dc.rights	2011 Taylor & Francis	en
dc.subject	Defects	en
dc.subject	Surface Anchoring	en
dc.subject	Annihilation	en
dc.subject	Boojums	en
dc.title	Effect of an electric field on defects in a nematic liquid crystal with variable surface anchoring	en
dc.type	Article	en
Appears in Collections:	Research Papers (SCM)

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