Abstract
A state-of-the-art calorimetric system has been established. The system enables us to measure simultaneously heat capacity and optical reflectivity of free-standing liquid-crystal films from many hundreds down to only two molecular layers in thickness. Our experimental results on the smectic-A-hexatic-B and smectic-C-smectic-I transitions cannot be described solely in terms of the creation of bond-orientational order, indicating that additional molecular order must be present in the hexatic phases of liquid crystals.
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Stoebe, T., Ho, J.T. & Huang, C.C. Heat capacity measurements of extremely thin substrate-free liquid-crystal films. Int J Thermophys 15, 1189–1197 (1994). https://doi.org/10.1007/BF01458827
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DOI: https://doi.org/10.1007/BF01458827