Influence of dipole-dipole correlations on the stability of the biaxial nematic phase in the model bent-core liquid crystal

Mikhail Osipov, Grzegorz Pajak

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A molecular theory of biaxial nematic ordering in the system of bent-core molecules has been developed in the two-particle cluster approximation which enables one to take into account short-range polar correlations determined by both electrostatic dipole-dipole interaction and polar molecular shape. All orientational order parameters and short-range correlation functions are calculated numerically as functions of temperature in the uniaxial and in the biaxial nematic phases, and the results are compared with the ones obtained in the mean-field approximation and in the cluster approximation but without taking into consideration the dipole-dipole interaction. It is shown that short-range polar correlations and, in particular, the dipole-dipole correlations dramatically increase the temperature of the transition into the biaxial nematic phase and enhancing its stability range. The results are also very sensitive to the value of the opening angle of a model bent-core molecule.

Original languageEnglish
Article number142201
Number of pages14
JournalJournal of Physics: Condensed Matter
Volume24
Issue number14
Early online date5 Mar 2012
DOIs
Publication statusPublished - 11 Apr 2012

Keywords

  • liquid crystal structure
  • polymers
  • soft matter
  • polar correlations

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