NDLI: Optical and thermodynamic studies of binary mixtures of nematic liquid crystals from homologous members of alkyloxybenzoic acid

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Optical and thermodynamic studies of binary mixtures of nematic liquid crystals from homologous members of alkyloxybenzoic acid

Content Provider	Semantic Scholar
Author	Dhar, Ravindra Pandey, Rama Shankar Agrawal, V. K.
Copyright Year	2002
Abstract	Transition temperature (Tp), transition enthalpy (ΔH) and transition entropy (AS) for the binary mixtures of heptyloxybenzoic acid (HOBA) and decyloxybenzoic acid (DOBA) in different mole ratios have been determined usingdifferential scanning calorimeter (DSC). The phase diagrams for the heating and cooling cycles have been drawn which show the eutectic composition of DOBA-HOBA binary system in the ratio of 48:52 mole per cent. A wide range smectic C (SmC) phase (range -40 °C) followed by the nematic (N) phase (range -34 °C) has been observed around the eutectic composition of DOBA-HOBA binary system. SmC-N and N-I (isotropic) transition temperatures (T C - N and T N - I ) have been found to vary, almost linearly, with the mole fraction of components, indicating the system as an ideal mixture. For the eutectic composition of the HOBA-DOBA system, it has been possible to bring down SmC phase to 60 °C with enhanced temperature range, whereas no member of the alkyloxybenzoic acid series has SmC phase below 92 °C.
Starting Page	901
Ending Page	907
Page Count	7
File Format	PDF HTM / HTML
Volume Number	40
Alternate Webpage(s)	http://nopr.niscair.res.in/bitstream/123456789/26216/1/IJPAP%2040(12)%20901-907.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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