Diyala Journal For Pure Science
Scientific Refereed Journal Published By College of Science - University of Diyala
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Diyala Journal For Pure Sciences DJPS
ISRA Impact Factor:3.715
P- ISSN:2222-8373, E-ISSN:2518-9255
Volume 13, Issue 1, Part 1 , January. 2017
Thermodynamic Characterization of Binary Mixtures of Smectic Phase Liquid Crystals
Juman A. Naser , Zainab W. Ahmed
Year: 2017, Volume: 13, Issue: 1, Part:1
Pages: 43-57, DOI: http://dx.doi.org/10.24237/djps.1301.146B
The binary mixture of 1-(para-Chloro benzylidene amino) -4-(2-n-hexylthio-1,3,4-oxadiazole-5yl) benzene and 1-(para-Nitro benzylidene amino)-4-(2-n-hexylthio-1,3,4-oxadiazole-5yl) benzene with different mole fractions has been characterized by a hot stage polarizing optical microscope (POM) to determine the type of texture, then investigated by differential scanning calorrimetry (DSC) technique to determine the specific enthalpies and transition temperatures of phases. The enthalpies of mixing have been calculated to suggest the molecules type. Continuously, The thermodynamic excess quantities (GE, SE and HE) were calculated by utilizing activity coefficient value of eutectic and isotropic phase, so molecular interactions behavior was described.
Keywords: Liquid crystals, Smectic, Binary system, Excess thermodynamic functions.