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Colloid and Polymer Science

, Volume 271, Issue 12, pp 1183–1190 | Cite as

Thermal membrane potential across cation-exchange membranes for various halide solutions

  • R. Kiyono
  • Y. Tanaka
  • O. Sekiguchi
  • M. Tasaka
Original Contributions

Abstract

Thermal membrane potential across cation-exchange membranes was measured for various halide solutions. Linear relationships between thermal membrane potential (ΔΨ) and temperature difference (ΔT) were observed, and the temperature coefficient of thermal membrane potential (ΔΨ/ΔT) decreases with increase in the molality of the external solution as predicted by a theory reported. When counterions of membranes are hydrogen ions, the sign of the coefficients turns into minus near 0.01 mol/kg of the external solution for all membranes, although the coefficients are always positive for all the other forms. The dependence of the coefficients on the molality of the external solutions sometimes deviated slightly from the theory. This deviation is attributed to some change in water content of the membranes. A reproducible method of measuring water content of membranes was applied to discuss the change in the state of the membranes.

Key words

Cation-exchange membrane nonisothermal systems thermal membrane potential transported entropy water content 

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Copyright information

© Steinkopff-Verlag 1993

Authors and Affiliations

  • R. Kiyono
    • 1
  • Y. Tanaka
    • 1
  • O. Sekiguchi
    • 2
  • M. Tasaka
    • 1
  1. 1.Department of Chemistry and Material Engineering Faculty of EngineeringShinshu UniversityNaganoJapan
  2. 2.Faculty of General StudiesGunma UniversityMaebashi, GunmaJapan

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