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Title: Effect of nonmesogenic impurities on the order of the nematic to smectic-A phase transition in liquid crystals
Authors: Denolf, Katleen ×
Van Roie, Bert
Glorieux, Christ
Thoen, Jan #
Issue Date: Sep-2006
Publisher: American Physical Society
Series Title: Physical Review Letters vol:97 issue:10
Article number: 107801
Abstract: By means of adiabatic scanning calorimetry, we have studied the effect of the nonmesogenic solutes cyclohexane (CH) and biphenyl (BP) on the nematic-smectic-A phase transition in the liquid crystal octylcyanobiphenyl (8CB). For all concentrations of BP studied, the transition remains second-order. For 8CB+CH, however, crossover from second-order to first-order is observed at a tricritical point of the mole fraction x of CH around 0.0460. The difference between the two systems and the crossover is explained in terms of a mean-field free energy density expression including coupling terms of x with the nematic and smectic-A order parameters.
URI: 
ISSN: 0031-9007
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter and Biophysics
× corresponding author
# (joint) last author

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