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Reentrant lyotropic nematic phase in a ternary mixture

ABSTRACT We report the results of our studies on optical and thermal properties of ternary mixture of three compounds viz., 4′-n-octyl-4-cyanobiphenyl (8CB), didodecyl dimethyl ammonium bromide, and glacial acetic acid. Higher concentrations of the given mixture show a very interesting reentrant nematic phase, sequentially when the specimen is cooled from its isotropic melt at different temperatures. The temperature variations of optical anisotropy, optical textures, and electrical conductivity have also been discussed. Nanoaggregated size of the molecules has been confirmed by X-ray studies.