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Apparent tricritical behavior at a nearly second-order nematic-isotropic phase transition of a cyclic liquid
Ishtiaque M Syed1, Virgil Percec, Rolfe G Petschek
1Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106-7079, USA.
Abstract:
The cyclic liquid crystalline trimer TPB-(c)9(3) was investigated by optical retardation and Fréedericksz techniques within a few tens of millikelvins of the superheating limit of the nearly second-order nematic-isotropic phase transition. Both the optical retardation and the Fréedericksz bend threshold voltage are in good agreement with tricritical behavior for the transition.