Physical properties of a bent-core nematic liquid crystal and its mixtures with calamitic molecules

A. Buka, N. Ber, K. Fodor-Csorba, A. Jákli, P. Salamon

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

This article summarizes the results obtained by various experimental methods on the physical properties of a bent-core nematic liquid crystal 4-chloro-1,3-phenylene bis-4-[4-(9-decenyloxy) benzoyloxy] benzoate (ClPbis10BB). The material exhibits unusual properties in all aspects tested. Its bend flexoelectric coefficient is 1000 times larger than in calamitics; it is viscoelastic with a large, shear-rate-dependent viscosity. Its bend and twist elastic constants are abnormally low; thus the nematic phase can be rendered to be a blue fog phase with a small amount of chiral dopant. It shows very high flow birefringence and unusually small leading Landau coefficient. It has two types of isotropic phases; at lower temperature it is probably tetrahedratic that can be transferred into the nematic phase with magnetic field. ClPbis10BB has a frequency-dependent conductivity anisotropy which is characterized by a double sign inversion. It exhibits various electroconvection (EC) patterns which are currently not understood in the frame of the standard theory of EC.

Original languageEnglish
Pages (from-to)872-887
Number of pages16
JournalPhase Transitions
Volume85
Issue number10
DOIs
Publication statusPublished - Oct 1 2012

Fingerprint

Nematic liquid crystals
Benzoates
Fog
Elastic constants
Birefringence
Shear deformation
Anisotropy
Physical properties
physical properties
liquid crystals
Doping (additives)
Viscosity
Magnetic fields
Molecules
fog
coefficients
birefringence
molecules
elastic properties
viscosity

Keywords

  • bent-core nematic liquid crystal
  • dielectric spectroscopy
  • elastic constant
  • electroconvection
  • flexoelectricity
  • flow birefringence

ASJC Scopus subject areas

  • Instrumentation
  • Materials Science(all)

Cite this

Physical properties of a bent-core nematic liquid crystal and its mixtures with calamitic molecules. / Buka, A.; Ber, N.; Fodor-Csorba, K.; Jákli, A.; Salamon, P.

In: Phase Transitions, Vol. 85, No. 10, 01.10.2012, p. 872-887.

Research output: Contribution to journalArticle

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