AC electric field induced flow and helix unwinding in focal conic texture of smectic C* liquid crystal
Open Access
- 1 January 1985
- journal article
- Published by EDP Sciences in Journal de Physique Lettres
- Vol. 46 (24) , 1177-1181
- https://doi.org/10.1051/jphyslet:0198500460240117700
Abstract
A thin (∼ 10 μm) focal conic texture of DOBAMBC in its Sm C* phase is submitted to an AC electric field. Above a field threshold, a DC plug flow of the texture normal to the layers is observed. It always originates from the focus of the ellipses towards their centre and extends to the entire focal domain. At higher field, the associated viscous shear unwinds the helical texture. The flow threshold is explained by the build up at the focus of a DC electric pressure, from the action of the AC field on AC space charges, generated by conductivity anisotropyKeywords
This publication has 6 references indexed in Scilit:
- Mechanical study of the ferroelastic smectic A to smectic C phase transitionJournal de Physique, 1984
- Effects of Electric Fields on the Helical Pitch in Chiral Smectic C Liquid CrystalsMolecular Crystals and Liquid Crystals, 1983
- Field-Induced First-Order Orientation Transitions in Ferroelectric Liquid CrystalsPhysical Review Letters, 1983
- Tempearture Dependence of Tilt, Pitch and Polarization in Ferroelectric Liquid crystalsMolecular Crystals and Liquid Crystals, 1981
- Evidence of two new ordered smectic phases in ferroelectric liquid crystalsJournal de Physique, 1978
- Recherches sur les textures des états mésomorphes - 1. Les arrangements focaux dans les smectiques : rappels et considérations théoriquesJournal de Physique, 1972