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Article
Dynamic Light Scattering Study of Biaxial Ordering in a Thermotropic Liquid Crystal
Physical Review Letters
  • K. Neupane, Kent State University - Kent Campus
  • S. W Kang, Kent State University - Kent Campus
  • D. Carney, University of Cincinnati - Main Campus
  • T. Meyer, University of Hull
  • G. H Mehl, University of Hull
  • David W Allender, Kent State University - Kent Campus
  • Satyendra Kumar, Kent State University - Kent Campus
  • S. Sprunt, Kent State University - Kent Campus
Publication Date
11-17-2006
Document Type
Article
DOI
10.1103/PhysRevLett.97.207802
Keywords
  • Core Azo Compounds,
  • Carbosilazane Cores,
  • Phase Transition,
  • Isotropic Phase,
  • Nematic Phase
Disciplines
Abstract

Dynamic light scattering from orientational order fluctuations in a liquid crystalline tetrapode reveals successive, weakly first-order isotropic to uniaxial and uniaxial to biaxial nematic phase transitions. The order parameter relaxation rates exhibit temperature dependences consistent with Landau–de Gennes mean field theory. Combined with previous evidence of a second-order uniaxial-biaxial transition in a closely related tetrapode, the present study supports the existence of a nematic-nematic tricritical point in thermotropic liquid crystals.

Comments

Copyright 2006 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevLett.97.207802.

Citation Information
K. Neupane, S. W Kang, D. Carney, T. Meyer, et al.. "Dynamic Light Scattering Study of Biaxial Ordering in a Thermotropic Liquid Crystal" Physical Review Letters Vol. 97 Iss. 20 (2006)
Available at: http://works.bepress.com/david_allender/12/