Photoacoustic Thermal Characterisation of Liquid Crystals

Abstract

Abstract A completely automatic photoacoustic setup with microphone detection, allowing the simultaneous measurement of the heat capacity and the thermal conductivity of small liquid crystal samples, has been used to investigate heptylcyanobiphenyl (7CB) in the isotropic and in the nematic phase. Measurements have been carried out with and without a magnetic field and for different modulation frequencies.