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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:19 |
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Conference: Bucharest University Faculty of Physics 2017 Meeting
Section: Polymer Physics
Title:
Electric response of an antisymmetric nematic liquid crystal cell
Authors:
Emil BARNA, Valentin BARNA, Catalin BERLIC
Affiliation:
University of Bucharest, Faculty of Physics, Magurele, Bucharest, Romania
E-mail
barnavalentin@yahoo.com
Keywords:
nematic liquid crystal, asymmetrical cell, polymer plasma deposition, polymeric films, polymer-liquid crystal interface
Abstract:
By electrical point of view, deposition of a polymer on an electrode of a classical liquid crystal cell creates an asymmetrical nematic liquid crystal cell. The polymer layer may be placed by various methods such as spin-coating, spraying or deposition in plasma. In this work, we present the behavior of an asymmetric nematic liquid crystal cell obtained by plasma deposition, where a special electrical behavior has been highlighted: the cell loaded at a continuous voltage has a discharge current which, after a time of 10-15 seconds, has a significant increase. We found that the time value is related to the thickness of the polymer layer and the occurrence of this effect was explained by the manifestation of the effects of the polymer-liquid crystal interface.
Acknowledgement:
The research activities were supported from the RO PN-II-RU-TE-2014-2412 grant
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