Open AccessThermotropic, refracting and thermo-optical properties in three homologs of 4-n-alkyl-4’-cyanobiphenyls
Author(s) -
Arif Nesrullajev
Publication year - 2015
Publication title -
lithuanian journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.269
H-Index - 16
eISSN - 2424-3647
pISSN - 1648-8504
DOI - 10.3952/physics.v55i1.3055
Subject(s) - liquid crystal , thermotropic crystal , refractive index , birefringence , isotropy , polarizability , alkyl , chemistry , materials science , optics , work (physics) , condensed matter physics , thermodynamics , liquid crystalline , physics , molecule , organic chemistry
Investigations of temperature behaviour of the mean refractive index n, ordinary n o and extraordinary n e refractive indices, and birefringence Δn have been carried out for three homologues of 4-n-alkyl-4’-cyanobiphenyls (n = 8, 10, 12). The principal polarizabilities α 0 and α e , effective geometry parameter α eg and average polarizability α ave have been calculated using the isotropic internal field model (Vuks approach). Temperature behaviour of the order parameter in regions of the smectic A–nematic , nematic–isotropic liquid and smectic A–isotropic liquid is discussed. All of the optical and orientational parameters, which have been obtained in this work, are in good agreement with the theoretical approach.