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Title: Orientational order parameter measurements of discotic liquid crystal

The IR dichroism technique is a convenient method which can be used to measure the molecular order parameter corresponding to the IR bands exclusively present in the disc –like molecules in discotic liquid crystal (DLC). To measure orientational order parameter, homeotropic alignment of discotic liquid crystal was attained by slow cooling of sample from isotropic phase on untreated flat CaF{sub 2} substrate. The homeotropic alignment thus achieved was found to be thermodynamically stable in the discotic mesophase. IR spectra were recorded at different temperatures for the DLC. The order parameter was calculated by comparing the spectra of discotic phase with that of the isotropic phase. Order parameter has been presented as function of temperature for different significant IR bands present in the DLC.
Authors:
 [1] ;  [2] ; ;  [3]
  1. Raman Research Institute, C. V. Raman Avenue, Bangalore-560080, India and Thapar University, Patiala-147004 (India)
  2. Thapar University, Patiala-147004 (India)
  3. Raman Research Institute, C. V. Raman Avenue, Bangalore-560080 (India)
Publication Date:
OSTI Identifier:
22269417
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1591; Journal Issue: 1; Conference: 58. DAE solid state physics symposium 2013, Patiala, Punjab (India), 17-21 Dec 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CALCIUM FLUORIDES; COOLING; DICHROISM; INFRARED SPECTRA; LIQUID CRYSTALS; ORDER PARAMETERS; SUBSTRATES; TEMPERATURE DEPENDENCE