A temperature-concentration (T-X) phase diagram calculated using the mean field theory for liquid crystals

YURTSEVEN H. H., Salihoglu S., KARACALİ H.

JOURNAL OF MOLECULAR MODELING, vol.19, no.6, pp.2473-2483, 2013 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 19 Issue: 6
  • Publication Date: 2013
  • Doi Number: 10.1007/s00894-013-1777-0
  • Journal Name: JOURNAL OF MOLECULAR MODELING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.2473-2483
  • Keywords: Mean field theory, Phase diagram, Liquid crystals, B-SMECTIC-A, HEXATIC-B, TRANSITIONS, ORDER, MIXTURE, MODEL, HEAT, RAY
  • Middle East Technical University Affiliated: Yes

Abstract

Phase-line equations for smectic-hexatic phase transitions in liquid crystals were derived using the Landau phenomenological theory. In particular, second-order transitions for the smectic-A-smectic-C (SmA-SmC) and hexatic-B-hexatic-F (or HexI) transitions were studied and the tricritical points for these transitions were located. The calculated phase-line equations were fitted (using experimental data for various liquid crystals) to construct a generalized T-X phase diagram. It was shown that the T-X phase diagram calculated from the free energy adequately describes the observed behavior of liquid crystals during smectic-hexatic transitions.