Abstract
The structural properties and flexoelectric coefficients e 1 and e 3 of polar liquid crystals (LCs) such as 4-n-pentyl-4′-cyanobiphenyl (5CB) are studied in the nematic phase by the molecular-dynamics and statistical-mechanics methods. A number of order parameters, \(\bar P_{2L} (L = 1,2,3)\) and \(\bar P_2 (r)\), and orientational correlations ξλ for the nearest and next-nearest neighbors were investigated. The calculations show the absence of spontaneous polarization \((\bar P_1 \simeq 0)\) in the nondeformed polar 5CB liquid crystal over the entire range of temperatures corresponding to the nematic phase. The origination of spontaneous polarization (characterized by two independent flexoelectric coefficients e 1 and e 3) in response to an external deformation of a 5CB sample is studied. The calculated e 1 and e 3 coefficients agree well with the experimental data for 5CB obtained by the pyroelectric method.
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Translated from Kristallografiya, Vol. 48, No. 4, 2003, pp. 738–744.
Original Russian Text Copyright © 2003 by Zakharov, Vakulenko.
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Zakharov, A.V., Vakulenko, A.A. Flexoelectric effect and statistical properties in polar liquid crystals. Crystallogr. Rep. 48, 686–692 (2003). https://doi.org/10.1134/1.1595197
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DOI: https://doi.org/10.1134/1.1595197