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DJPS

Diyala Journal For Pure Science

Scientific Refereed Journal Published By College of Science - University of Diyala

 

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djps.1301.146B

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

 

Language: English

 

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Abstract    


 

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.

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