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The heat capacities of the binary system consisting of a nonionic surfactant, hexaoxyethylene n -dodecyl ether (C 12 E 6 ), and water were precisely measured as a function of temperature by adiabatic calorimetry over the temperature and the concentration ranges where lyotropic liquid crystals are formed. The enthalpy and entropy of transitions were determined for all transitions observed. The enthalpy and entropy of transition between liquid crystalline phases suggest that the liquid crystalline phases in this system are mainly constructed by C 12 E 6 molecules with a fixed amount of water. The excess heat capacities, as estimated by measuring the heat capacity of neat C 12 E 6, are positive over the entire temperature and concentration ranges. The excess heat capacities also support the suggestion given above concerning the role of C 12 E 6 molecules on the structure building.
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Saito et al. (2001) studied this question.
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