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Electro-osmosis and flexo-electricity in the dowser texture
Pawel Pieranski1, Maria Helena Godinho2
1Laboratoire de Physique des Solides, Université Paris-Sud, Bât. 510, 91405, Orsay, France. pawel.pieranski@u-psud.fr.
Abstract:
Due to its low symmetry, the long-lived pseudo-planar texture, dubbed "the dowser texture", has a flexo-electric spontaneous polarisation [Formula: see text]. Being degenerated, the dowser texture is easily aligned by the electric torque [Formula: see text] acting on [Formula: see text]. The dowser texture can also be aligned by Poiseuille flows driven by electro-osmosis. The hydrodynamic torques due to the electro-osmotic flows are linear in [Formula: see text] like the electrical one. It is shown that in 5CB the electro-osmotic flows can alter measurements of the flexo-electric polarisation.
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