An experimental investigation of electromechanical coupling in cholesteric liquid crystals

Madhusudana, N.V.; Pratibha, R.

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DC Field	Value	Language
dc.contributor.author	Madhusudana, N.V.	-
dc.contributor.author	Pratibha, R.	-
dc.date.accessioned	2007-06-18T04:38:13Z	-
dc.date.available	2007-06-18T04:38:13Z	-
dc.date.issued	1989	-
dc.identifier.citation	Liquid Crystals, 1989, Vol.5, 1827 - 1840	en
dc.identifier.issn	0267-8292	-
dc.identifier.issn	1366-5855 (online)	-
dc.identifier.uri	http://hdl.handle.net/2289/2914	-
dc.description	Restricted Access.	en
dc.description.abstract	Cholesteric liquid crystals which have a helical arrangement of oriented chiral molecules are expected to show novel cross couplings between fluxes and forces. The most convincing demonstration of these couplings is through a dynamical effect on the structure. Though Lehmann found a rotation of the structure under a temperature gradient in 1900, there has been no subsequent experiment confirming the same. We argue that it is very difficult to obtain a sufficiently weak anchoring of the director at the solid-cholesteric interface which is a necessary condition for the occurrence of Lehmann rotation. In order to achieve a practically zero anchoring energy at the surface, we have devised a simple technique of floating essentially flat cholesteric drops in the isotropic phase. Using this configuration we study the electromechanical coupling which produces a rotation of the structure under the action of a DC electric field. Using measurements on samples with different values of the pitch the relevant electromechanical coefficient of the materials investigated is found to satisfy the relation vE = -0·6 × 10-12(q/m-1)J m-2, where q is the wavevector of the helix, whose sign is positive (negative) for a right (left) handed structure, confirming that vE is hydrodynamic in origin.	en
dc.format.extent	896725 bytes	-
dc.format.mimetype	application/pdf	-
dc.language.iso	en	en
dc.publisher	Taylor & Francis	en
dc.relation.uri	http://dx.doi.org/10.1080/02678298908045691	en
dc.rights	1989 Taylor & Francis	en
dc.title	An experimental investigation of electromechanical coupling in cholesteric liquid crystals	en
dc.type	Article	en
Appears in Collections:	Research Papers (SCM)

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