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Article
Raman Scattering Study of Phase Biaxiality in a Thermotropic Bent-Core Nematic Liquid Crystal
Physical Review Letters
  • Min Sang Park, Georgia Institute of Technology - Main Campus
  • Beom-Kin Yoon, Georgia Institute of Technology - Main Campus
  • Jung Ok Park, Georgia Institute of Technology - Main Campus
  • Veena Prasad, Center for Liquid Crystal Research, India
  • Satyendra Kumar, Kent State University
  • Mohan Srinivasarao, Georgia Institute of Technology - Main Campus
Publication Date
7-8-2010
Document Type
Article
DOI
10.1103/PhysRevLett.105.027801
Keywords
  • Order Parameters,
  • Viscous Properties,
  • Molecular Theory,
  • Transitions,
  • Particles,
  • Mixtures,
  • Fluid
Disciplines
Abstract
Polarized Raman spectroscopy was used to investigate the development of orientational order and the degree of phase biaxiality in a bent-core mesogenic system. The values of the uniaxial order parameters ⟨P200⟩ and ⟨P400⟩, and biaxial order parameters ⟨P220⟩, ⟨P420⟩, and ⟨P440⟩, and their evolution with temperature were determined. The temperature dependence of almost all order parameters reveals a second order transition from the uniaxial to biaxial nematic phase with ⟨P220⟩ increasing to ∼0.22 before a first order transition to the smectic-C phase, upon cooling.
Comments

Copyright 2010 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevLett.105.027801.

Citation Information
Min Sang Park, Beom-Kin Yoon, Jung Ok Park, Veena Prasad, et al.. "Raman Scattering Study of Phase Biaxiality in a Thermotropic Bent-Core Nematic Liquid Crystal" Physical Review Letters Vol. 105 Iss. 2 (2010)
Available at: http://works.bepress.com/satyendra_kumar/54/