Abstract
A theory is suggested for predicting the threshold voltage for dynamic scattering in nematic liquid crystals subject to a constant electric field. Because of experimental results showing similar instabilities in isotropic liquids, an isotropic model is used. The electrical behaviour of the liquid is assumed to have a charge carrier dissociation-recombination process in equilibrium. Under these assumptions, typical ion density curves are obtained and a non-zero charge density is found near the electrodes. The resulting electrical forces result in an instability. Calculations are performed to predict the threshold voltage for the instability. Order-of-magnitude calculations give results consistent with experimental data in liquid crystals.
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