Liquid Crystal Purification by Zone Refining

Abstract

Abstract A series of nematic liquid crystals which had been solvent recrystallized was further purified by use of the technique of zone refining. In all cases purity increased. Purity was determined using differential scanning calorimetry. Purity differences when the zone refiner was used at mesophase temperatures and isotropic liquid temperatures were studied. A comparison of the results from this study with those of other investigators is given, and the implications concerning thermodynamic measurements on liquid crystals are discussed.