Molecular field theory for polar, biaxial bent-core nematics
| Autor: | Tung B.T. To, Geoffrey R. Luckhurst, Timothy J. Sluckin |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Condensed matter physics Biaxial nematic Bent molecular geometry 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Condensed Matter::Soft Condensed Matter Transverse plane Dipole Liquid crystal Phase (matter) 0103 physical sciences Polar General Materials Science Field theory (psychology) 010306 general physics 0210 nano-technology |
| Zdroj: | Liquid Crystals. 43:1448-1461 |
| ISSN: | 1366-5855 0267-8292 |
| DOI: | 10.1080/02678292.2016.1181214 |
| Popis: | We have studied a polar, biaxial nematic liquid crystal formed from bent-core molecules using molecular field theory. The model includes a simple Heisenberg-form dipolar intermolecular interaction in addition to the usual quadrupolar nematic interaction, and mimics a system consisting of nematogenic bent-core molecules with a large transverse dipole along the bisector of the two molecular arms. Such systems are regarded as good candidates for biaxial nematic liquid crystals. In principle, the molecular dipoles can align, thus stabilising the ordering of the minor axes. Our calculations predict that, for suitable values of the bent-core interarm angle, the biaxial nematic phase can be stabilised at higher temperatures than in the absence of the transverse dipole. In general, the transverse macroscopic polar order stabilises the biaxial nematic phase. In particular, for a large enough dipolar interaction, the Landau point in the pure biaxial nematic develops into a line of first-order polar biaxial ... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|