Gels pp 101-109 | Cite as

Reaction, diffusion, electric conduction and determination of fixed ions in a hydrogel

  • L. Hegedüs
  • M. Wittmann
  • N. Kirschner
  • Z. Noszticzius
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 102)


Connecting the aqueous solutions of strong acid and a strong base with a hydrogel cylinder in electric field creates a special nonequilibrium chemical system called “electrolyte diode”, where reaction, diffusion and electric conduction can be studied simultaneously. It was found that the current-voltage characteristic of such a diode is strongly affected by relatively small concentrations of fixed ions in the hydrogel. A theory to explain the role of the fixed ions is proposed. According to that theory, from the slope and the intercept of the current-voltage characteristic curve the fixed ion concentration can be easily calculated. Experiments with pure and polyelectrolyte modified PVA based hydrogels support the proposed theory.

Key words

Hydrogels fixed ions polyelectrolytes electric condition current-voltage characteristic 


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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1996

Authors and Affiliations

  • L. Hegedüs
    • 1
  • M. Wittmann
    • 1
  • N. Kirschner
    • 1
  • Z. Noszticzius
    • 1
  1. 1.Department of Chemical PhysicsTechnical University of BudapestBudapestHungary

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