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  • Title: Effect of smectic short-range order on the discontinuous anchoring transition in nematic liquid crystals.
    Author: Sai DV, Kumar TA, Haase W, Roy A, Dhara S.
    Journal: J Chem Phys; 2014 Jul 28; 141(4):044706. PubMed ID: 25084936.
    Abstract:
    We report studies on the temperature dependent alignment behavior of a homologous series of trans, trans- 4, 4'-dialkyl-(1α,1' α-bicyclohexyl)-4β-carbonitrile (CCNs) on a perfluoropolymer coated cells. Among six compounds in the series, one (CCN-35) has only nematic phase and the remaining five have either smectic-A or smectic-B in addition to the nematic phase. We simultaneously performed temperature dependent dielectric measurements and optical polarising microscope observation. It is found that except for CCN-35 and CCN-73, the remaining four compounds exhibit discontinuous anchoring transition from planar to homeotropic and vice versa with increasing thermal hysteresis. We developed a simple theory taking into account the effect of smectic short-range order at the substrates to explain the experimental observations.
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