High-Resolution Adiabatic Calorimetry Measurements in the Vicinity of the Liquid Crystal Phase Transitions

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Abstract
High-resolution adiabatic calorimetry has been used for the study of the liquid_crystal phase transitions in mixtures of 4-n-hexyloxyphenyl-4″-n-octyloxybenzoate ( ), 4-n-hexyloxy-phenyl-n-decyloxybenzoate ( ) and 4-n-hexyloxyphenyl-4″-n-dodexyl-oxybenzoate ( ) with emphasis on the vicinity of the NAC (nematic-smectic A-smectic C) multicritical point and the tricritical point along the NA (nematic-smectic A) line. Our results demonstrate the fluctuation nature of both these multi-critical points.