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Title: Influence of flexoelectricity on electrohydrodynamic instabilities in nematics under AC fields
Authors: Madhusudana, N.V.
Raghunathan, V.A.
Issue Date: 1988
Publisher: Gordon and Breach Science Publishers.
Citation: Molecular Crystals and Liquid Crystals Letters, 1988, Vol.5, p201-209
Abstract: We develop a one-dimensional theory of electrohydrodynamic instabilities in nematics under AC excitation by incorporating the flexoelectric terms. The results account for the following observations which were not adequately explained earlier: (1) the occurrence of oblique rolls (OR) at a thre- shold voltage Vth (v) up to a certain well defined frequency v which depends on the conductivity of the sample, (2) the occurrence of OR at voltages > Vth at which normal rolls are seen for some frequency range vc > v > vo, (3) the observation of 'chevronsf in the dielectric regime and (4) the occurrence of 'longitudi- nal' rolls with a field threshold for materials with a negative dielectric anisotropy close to the nematic - smectic transition point.
Description: Restricted Access.
ISSN: 0140-6566
Copyright: 1988 OPA (Overseas Publishers Association) N.V.
Appears in Collections:Research Papers (SCM)

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