Crystallography Reports

, Volume 48, Issue 4, pp 686–692

Flexoelectric effect and statistical properties in polar liquid crystals

  • A. V. Zakharov
  • A. A. Vakulenko
Liquid Crystals

DOI: 10.1134/1.1595197

Cite this article as:
Zakharov, A.V. & Vakulenko, A.A. Crystallogr. Rep. (2003) 48: 686. doi:10.1134/1.1595197

Abstract

The structural properties and flexoelectric coefficients e1 and e3 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 e1 and e3) in response to an external deformation of a 5CB sample is studied. The calculated e1 and e3 coefficients agree well with the experimental data for 5CB obtained by the pyroelectric method.

Copyright information

© MAIK "Nauka/Interperiodica" 2003

Authors and Affiliations

  • A. V. Zakharov
    • 1
  • A. A. Vakulenko
    • 1
  1. 1.Institute of Problems in Machine ScienceRussian Academy of SciencesSt. PetersburgRussia