Determination of Orientational Order Parameters of Two Tri-Component Mixtures from Optical Birefringence and X-Ray Diffraction Measurements

• Authors: S. Basak , P. Dasgupta , B. Das , M. Das , R. Dabrowski
• Languages of publication: EN

Abstracts

EN

Two tri-component mixtures as base mixtures for vertically aligned mode LCD's were prepared. The eutectic compositions were theoretically estimated and experimentally verified from differential scanning calorimetry studies. A room temperature nematic mixture with fairly broad operating range emerged from each of the tri-component mixtures. The optical birefringence of these mixtures at the eutectic composition was measured as a function of temperature. X-ray diffraction measurements were done on these mixtures to obtain the orientational order parameters as a function of temperature. The order parameter values were also determined from birefringence measurements and the results were compared with mean field theory. Structural parameters like intermolecular distance and apparent molecular length have also been determined.

Keywords

EN

61.05.cp; 61.30.-v; 42.70.Df

Discipline

• 61.05.cp: X-ray diffraction
• 61.30.-v: Liquid crystals(for phase transitions in liquid crystals, see 64.70.M-; for liquid crystals as dielectric materials, see 77.84.Nh; for liquid crystals as optical materials, see 42.70.Df; for liquid crystal devices, see 42.79.Kr)
• 42.70.Df: Liquid crystals(for structure of liquid crystals, see 61.30.-v)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2011
• Volume: 120
• Issue: 6
• Pages: 1037-1042

Dates

published

2011-12

received

2011-05-16

(unknown)

2011-08-02

Contributors

author

S. Basak

• Department of Physics, Siliguri Institute of Technology, Siliguri, Darjeeling - 734 009, India

author

P. Dasgupta

• Department of Physics, Siliguri Institute of Technology, Siliguri, Darjeeling - 734 009, India

author

B. Das

• Department of Physics, Siliguri Institute of Technology, Siliguri, Darjeeling - 734 009, India

author

M. Das

• Department of Physics, University of North Bengal, Darjeeling - 734 013, India

author

R. Dabrowski

• Department of Advanced Technologies and Chemistry, Military University of Technology, 00-908 Warsaw, Poland

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Identifiers

DOI

10.12693/APhysPolA.120.1037