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Title: Phase behavior and dynamics of a cholesteric liquid crystal

The synthesis, equation of state, phase diagram, and dielectric relaxation properties are reported for a new liquid crystal, 4{sup ′}-butyl-4-(2-methylbutoxy)azoxybenzene (4ABO5*), which exhibits a cholesteric phase at ambient temperature. The steepness of the intermolecular potential was characterized from the thermodynamic potential parameter, Γ = 4.3 ± 0.1 and the dynamic scaling exponent, γ = 3.5 ± 0.2. The difference between them is similar to that seen previously for nematic and smectic liquid crystals, with the near equivalence of Γ and γ consistent with the near constancy of the relaxation time of 4ABO5* at the cholesteric to isotropic phase transition (i.e., the clearing line). Thus, chirality does not cause deviations from the general relationship between thermodynamics and dynamics in the ordered phase of liquid crystals. The ionic conductivity of 4ABO5* shows strong coupling to the reorientational dynamics.
Authors:
; ;  [1] ; ;  [2] ;  [3]
  1. Naval Research Laboratory, Chemistry Division, Code 6120, Washington DC 20375-5342 (United States)
  2. Institute of Chemistry, Military University of Technology, 00-908 Warsaw (Poland)
  3. Institute of Physics, Jagiellonian University, Krakow (Poland)
Publication Date:
OSTI Identifier:
22255104
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 140; Journal Issue: 7; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AMBIENT TEMPERATURE; CHIRALITY; EQUATIONS OF STATE; LIQUID CRYSTALS; PHASE DIAGRAMS; PHASE TRANSFORMATIONS; RELAXATION TIME; SYNTHESIS; THERMODYNAMICS