Thermal membrane potential across test anion-exchange membrane ACIPLEX STA and the transported entropy of counterions.

Hanaoka, Kokichi; Kiyono, Ryotaro; Tasaka, Masayasu; Hamada, Masato; Yoshie, Kiyotaka

doi:10.5360/membrane.18.363

membrane

1993

DOI: 10.5360/membrane.18.363

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Thermal membrane potential across test anion-exchange membrane ACIPLEX STA and the transported entropy of counterions.

Kokichi Hanaoka¹,

Ryotaro Kiyono²,

Masayasu Tasaka³

et al.

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1994

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Cited by 2 publications

References 4 publications

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Thermal Membrane Potential across Anion-Exchange Membranes in Various Electrolyte Solutions and the Transported Entropy of Ions

Hanaoka¹,

Kiyono²,

Tasaka³

1994

Bulletin of the Chemical Society of Japan

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The thermal membrane potential cell with solution inlet channels was constructed from two blocks of poly(methyl methacrylate). Using the cell the thermal membrane potentials across anion-exchange membranes Aciplex A-201, A-211, and A-221, and Neosepta AM-1 were observed in inorganic electrolytes: KF, KCl, KI, KNO3, KClO3, and KIO3, and in organic electrolytes: HCOONa, CH3COONa, CH3COOK, and C6H5COONa. The thermal membrane potential Δψ across the anion-exchange membrane was always positive at the cold solution side. The temperature coefficient of the thermal membrane potential per unit temperature difference Δψ/ΔT is proportional to the logarithmic activities of the ions and the slope of this plot was R/F in the range of ideal permselectivity for the counterions except Aciplex A-221. The transported entropies of the counterions in the membrane were estimated by combining data for the thermal membrane potential, thermoosmosis, and electroosmosis. For all types of membranes, both terms of water and ions in the thermal membrane potential increased with the increasing of the friction coefficient of ions.

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Thermal Membrane Potential across Anion-Exchange Membranes in Various Electrolyte Solutions and the Transported Entropy of Ions

Hanaoka¹,

Kiyono²,

Tasaka³

1994

Bulletin of the Chemical Society of Japan

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

Huda¹,

Kiyono²,

Tasaka³

et al. 1998

Bulletin of the Chemical Society of Japan

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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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Thermal membrane potential across test anion-exchange membrane ACIPLEX STA and the transported entropy of counterions.

Cited by 2 publications

References 4 publications

Thermal Membrane Potential across Anion-Exchange Membranes in Various Electrolyte Solutions and the Transported Entropy of Ions

Thermal Membrane Potential across Anion-Exchange Membranes in Various Electrolyte Solutions and the Transported Entropy of Ions

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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