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  • Title: Effect of nonmesogenic impurities on the order of the nematic to smectic-A phase transition in liquid crystals.
    Author: Denolf K, Van Roie B, Glorieux C, Thoen J.
    Journal: Phys Rev Lett; 2006 Sep 08; 97(10):107801. PubMed ID: 17025855.
    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.
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