2A16 リオトロピック液晶ヘキサオキシエチレン-n-ドデシルエーテル/水2成分系の熱容量

概要

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Heat capacities of the lyotropic liquid crystal formed in the binary system, non-ionic surfactant hexaoxyethylene-n-dodecyl ether (C_<12>E_6)/water, were measured with an adiabatic calorimeter between 268 and 360 K. Samples were prepared in several concentrations around 65 weight % of the C_<12>E_6 surfactant in water. In the liquid crystal region, the hexagonal (H_I)-cubic (V_I) and cubic-lamellar (L_α) phase transitions were observed, and phase transition temperatures depended on the concentration. The hexagonal-cubic and cubic-lamellar phase transitions are of first-order, as shown by the existence of biphasic regions. Entropy and enthalpy changes at each phase transition are determined and thermodynamic properties in the cubic phase of this system are compared with those of the thermotropic cubic liquid crystals.
日本液晶学会の論文
1998-10-12