Critical behavior at the isotropic-to-nematic phase transition in a bent-core liquid crystal

D. Wiant, S. Stojadinovic, K. Neupane, S. Sharma, K. Fodor-Csorba, A. Jákli, J. T. Gleeson, S. Sprunt

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Magnetic birefringence and dynamic light scattering measurements of orientational order parameter fluctuations at the isotropic-nematic phase transition of a bent-core liquid crystal reveal a pretransitional temperature dependence consistent with the standard Landau-deGennes mean field theory. However, as follows: the transition in the bent-core compound is more weakly first order (TNI - T* 0.4 °C), the leading Landau coefficient is ∼30 times lower, the viscosity associated with nematic order fluctuations is ∼10 times higher, and the density change is ∼10 times lower, than typically observed in calamitic (rod-shaped) liquid crystals. One consistent explanation for these anomalies is an optically isotropic phase composed of microscopic complexes or "clusters" of bent-core molecules.

Original languageEnglish (US)
Article number030703
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume73
Issue number3
DOIs
StatePublished - Mar 31 2006

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Critical Behavior
Liquid Crystal
Phase Transition
liquid crystals
Fluctuations
Dynamic Light Scattering
Birefringence
Mean-field Theory
Temperature Dependence
Order Parameter
Anomaly
birefringence
Viscosity
light scattering
rods
Molecules
viscosity
anomalies
First-order
temperature dependence

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

Cite this

Critical behavior at the isotropic-to-nematic phase transition in a bent-core liquid crystal. / Wiant, D.; Stojadinovic, S.; Neupane, K.; Sharma, S.; Fodor-Csorba, K.; Jákli, A.; Gleeson, J. T.; Sprunt, S.

In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, Vol. 73, No. 3, 030703, 31.03.2006.

Research output: Contribution to journalArticle

Wiant, D. ; Stojadinovic, S. ; Neupane, K. ; Sharma, S. ; Fodor-Csorba, K. ; Jákli, A. ; Gleeson, J. T. ; Sprunt, S. / Critical behavior at the isotropic-to-nematic phase transition in a bent-core liquid crystal. In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. 2006 ; Vol. 73, No. 3.
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