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Experimental investigation of phase transitions exhibited by symmetric liquid crystal dimers
Author(s) -
Gogoi B.,
Ghosh T. K.,
Alapati P. R.
Publication year - 2005
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200410413
Subject(s) - liquid crystal , homologous series , phase transition , phase (matter) , isotropy , monomer , crystallography , chemistry , alkane , materials science , thermodynamics , organic chemistry , polymer , optics , hydrocarbon , physics , optoelectronics
As a part of our systematic study of phase transitions in liquid crystal dimers we report here the variation of density across the phase transitions Isotropic – Smectic A and Smectic A – Smectic F exhibited by the Schiff base liquid crystal dimeric compounds of α,ω‐bis(4‐alkylanilinebenzylidene‐4′‐oxy)alkane (m.OnO.m) homologous series. The compounds studied are 6.O5O.6 and 6.O6O.6. The compound 6.O5O.6 exhibits only Smectic A phase, whereas the compound 6.O6O.6 exhibits Smectic A and Smectic F phases. The density jumps and peak in thermal expansion coefficient at the transitions confirm the first order nature of the transitions with a smaller density jumps compared to the monomeric liquid crystals. The calculated pressure dependance of the transition temperatures using Clauasius‐ Clapeyron equation is also reported. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)