Abstract
The application of the gas cell and microphone photo-acoustic technique to detect first- and near-second-order phase transitions in 8CB liquid crystal is shown. A relaxation process in the smectic A phase attributed to defect migration is reported. The adopted geometry allows an interpretation of the results according to available models. Microcalorimetric application of the technique can therefore be expected, even close to the phase transitions where critical thermal conductivity phenomena occur.
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