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Titolo:
Mechanism of relaxation from electric field induced homeotropic to planar texture in cholesteric liquid crystals
Autore:
Sergan, V; Reznikov, Y; Anderson, J; Watson, P; Ruth, J; Bos, P;
Indirizzi:
Kent State Univ, Inst Liquid Crystal, Kent, OH 44240 USA Kent State Univ Kent OH USA 44240 Inst Liquid Crystal, Kent, OH 44240 USA
Titolo Testata:
MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS
, volume: 330, anno: 1999,
parte:, 3
pagine: 1339 - 1344
SICI:
1058-725X(1999)330:<1339:MORFEF>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Keywords:
cholesteric liquid crystals; bistable reflective displays; liquid crystal texture; relaxation time;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
9
Recensione:
Indirizzi per estratti:
Indirizzo: Sergan, V Kent State Univ, Inst Liquid Crystal, Kent, OH 44240 USA Kent State Univ Kent OH USA 44240 d Crystal, Kent, OH 44240 USA
Citazione:
V. Sergan et al., "Mechanism of relaxation from electric field induced homeotropic to planar texture in cholesteric liquid crystals", MOL CRYST A, 330, 1999, pp. 1339-1344

Abstract

We have investigated the relaxation process from a homeotropic structure to the planar one in a cholesteric liquid crystal. The relaxation occurs after switching off the electric field. We have developed a new experimental photography technique with a time resolution of about 20 mu s and applied itto the investigation of textural changes during the transition. After the liquid crystal goes through a defect-free transient planar structure, the development of the cholesteric helices occurs in two stages. Direct observations have shown that formation of the final equilibrium state involves a nucleation process. We used optical retroreflection spectroscopy and measurement of light scattering to observe changes of the cholesteric pitch and orientation of helices as well as the size of domains in time for various treatments of the glass substrates. We have also proposed a theoretical model that describes the experimental data satisfactorily.

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Documento generato il 30/03/20 alle ore 18:09:38