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    Dielectric and flexoelectric deformations induced by ac electric field in insulating nematic layers
    (Wydawnictwo Politechniki Łódzkiej, 2010) Derfel, Grzegorz; Buczkowska, Mariola; Guzowski, Jakub
    The deformations of homeotropic nematic layers induced by ac electric field of frequency f were studied numerically. Two kinds of nematic liquid crystals with small negative dielectric anisotropy, Δε < 0, were considered: (i) the non-flexoelectric nematic, (ii) the nematic characterised by the positive sum of flexoelearic coefficients e = e11 + e33 > 0. It was found that at sufficiently low frequencies, the deformations varied with time. The deformations of purely dielectric nature had the period l/(2f). The time period of flexoelectric distortions was equal to 1/f. The influence of rotational viscosity and of thickness of the layer on the dynamics of deformations was analysed.