Influence of DC voltage on the dielectric properties of nematics

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N. ÉBER, B. FEKETE, P. SALAMON, Á. BUKA, A. KREKHOV

Abstract. We report on precise impedance measurements, with the aim of exploring the influence of a dc bias voltage on the dielectric permittivity and electrical conductivity of liquid crystals and on their anisotropies. We prove that the dielectric permittivity is not affected by a dc bias; however, the electrical conductivity suffers a substantial reduction upon increasing the superposed dc voltage. Moreover, we show that the relative conductivity anisotropy also diminishes at increasing dc bias.

Keywords
Liquid Crystals, Conductivity, Anisotropy

Published online 12/10/2016, 3 pages
Copyright © 2016 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: N. ÉBER, B. FEKETE, P. SALAMON, Á. BUKA, A. KREKHOV, ‘Influence of DC voltage on the dielectric properties of nematics’, Materials Research Proceedings, Vol. 1, pp 42-44, 2016
DOI: http://dx.doi.org/10.21741/9781945291197-11

The article was published as article 11 of the book Dielectric Materials and Applications

References
[1] P. Salamon, N. Éber, B. Fekete, and Á. Buka, “Inhibited pattern formation by asymmetrical high-voltage excitation in nematic fluids,”. Phys. Rev. E, vol. 90, 022505/1-5, August 2014. http://dx.doi.org/10.1103/PhysRevE.90.022505
[2] N. Éber, P. Salamon, B. A. Fekete, R. Karapinar, A. Krekhov, and Á. Buka, „Suppression of spatially periodic patterns by dc voltage,” Phys. Rev. E, in press. http://dx.doi.org/10.1103/physreve.93.042701
[3] P. Salamon, N. Éber, A. Krekhov, and Á. Buka, “Flashing flexodomains and electroconvection rolls in a nematic liquid crystal,” Phys. Rev. E, vol. 87, 032505/1- (2013).