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Differential scanning calorimetry measurements of the smectic-A-cholesteric latent heat of transition in binary mixtures: cholesteryl palmitate (C16) and cholesteryl myristate (C14), cholesteryl myristate and cholesteryl nonanoate (C9), cholesteryl nonanoate and cholesteryl caproate (C6); strongly suggest the existence of tricritical point at approximately the reduced temperature TAC/TCI ≅ 0,90 in mixture C9-C6.
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Palangana et al. (1985) studied this question.
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