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Proceedings Paper

Threshold of structural transition in nematic drops with normal boundary conditions in AC electric field
Author(s): Vladimir G. Bodnar; Alexandr V. Koval'chuk; Oleg D. Lavrentovich; V. M. Pergamenshchik; V. V. Sergan
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Paper Abstract

The rearrangements in dispersed nematic drops with normal boundary conditions in an external ac electric field have been closely investigated with a polarizing microscope. It is shown both experimentally and theoretically that the dependence of the critical field Ec, which causes the replacement of the radial-like structure by an axial one, on the drop diameter d can be nonmonotonic. For small drops (d < de) Ec decreases as d increases; for large drops (d >> de), Ec increases with d. Here de is the thickness of the domain wall associated with strong director deformations localized at the drop equator, which may be roughly estimated as electric coherence length. The elastic deformations associated mainly with this wall are shown to be responsible for the above mentioned peculiarities of Ec(d).

Paper Details

Date Published: 1 June 1991
PDF: 12 pages
Proc. SPIE 1455, Liquid-Crystal Devices and Materials, (1 June 1991); doi: 10.1117/12.44699
Show Author Affiliations
Vladimir G. Bodnar, Institute of Physics (Ukraine)
Alexandr V. Koval'chuk, Institute of Physics (Ukraine)
Oleg D. Lavrentovich, Institute of Physics (Ukraine)
V. M. Pergamenshchik, Institute of Physics (Ukraine)
V. V. Sergan, Institute of Physics (Ukraine)

Published in SPIE Proceedings Vol. 1455:
Liquid-Crystal Devices and Materials
Paul S. Drzaic; Uzi Efron, Editor(s)

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