Membrane Phenomena in Nonisothermal Systems: Part 3. Thermal Membrane Potential across Various Hydrophobic Anion-Exchange Membranes with 10 and 14% Divinylbenzene.

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  • Huda Masud Shamsul
    Department of Materials Science and Engineering, Graduate School of Science and Technology, Shinshu University
  • Kiyono Ryotaro
    Department of Materials Science and Engineering, Graduate School of Science and Technology, Shinshu University
  • Tasaka Masayasu
    Department of Materials Science and Engineering, Graduate School of Science and Technology, Shinshu University
  • Yamaguchi Takanori
    Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Yamaguchi University
  • Sata Toshikatsu
    Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Yamaguchi University

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  • Membrane Phenomena in Nonisothermal Sys

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The thermal membrane potential across anion-exchange membranes having various hydrophobic anion-exchange groups was measured for various electrolyte solutions. A good linear relationship between the thermal membrane potential (Δψ) and the logarithmic temperature difference (Δln T) was observed. The temperature coefficient of the thermal membrane potential (Δψ/Δln T) was found to be a function of the logarithmic activities of ions with a slope of RTc/F for 1-1 electrolytes and RTc/(2F) for 1-2 electrolytes, where Tc is the constant temperature of the solution on one side of the membrane. The absolute value of Δψ/Δln T decreased with increasing the molality of the external electrolyte solutions. The absolute value of Δψ/Δln T in KCl solutions was higher than that in KIO3 solutions. For halide ions the order of the absolute values of the thermal membrane potential (Δψ) was Cl− > Br− > I−, which corresponds to the order of the values of the B-coefficient in the Jones–Dole expression for the viscosity of the solutions, but opposite to that of the conventional partial molar volume. For large oxoanions the order of the absolute values of Δψ was found to be NO3− > IO3− > SO42−, which is opposite to the order of the B-coefficient as well as to that of the molar volume of these hydrated ions.

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