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DC Field | Value | Language |
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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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File | Description | Size | Format | |
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1989 LC V5 p1827.pdf Restricted Access | Restricted Access | 875.71 kB | Adobe PDF | View/Open Request a copy |
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