試作アニオン交換膜ACIPLEX STAを通しての熱膜電位と対イオンの輸送エントロピー

概要

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An improved thermal membrane potential cell was constructed with blocks of poly (vinyl chloride). In the new cell the membrane was used as a ribbon with the two contacts to the external solutions on opposite sides and separated by 0 to 10 mm. Thermal membrane potentials across test anion-exchange membranes Aciplex STA-1 to 5, of which the thickness is about 0.1 mm, were measured using the new cell. The transported entropy of counterions in the membranes was estimated from experimental data for thermal membrane potential, electroosmosis and thermoosmosis. Thermal membrane potentials across STA-2 to 5 were nearly equal to each other regardless of the differences in the water content, the ion-exchange capacity and the DVB content. However, the difference between the mean molar transported entropy of counterions and the partial molar entropy of the ions in the external solutions (s_-s_), which reflects to the stability of counterions in the membrane, decreases roughly with decrease in the water content or with increase in the molality of fixed charges in the membrane. The absolute values of thermal membrane potentials across STA-3 increased in the order of I->Cl-≈Br->IO3->F-≈CH3COO- ion forms.
日本膜学会の論文