Reaction, diffusion, electric conduction and determination of fixed ions in a hydrogel
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 wordsHydrogels fixed ions polyelectrolytes electric condition current-voltage characteristic
Unable to display preview. Download preview PDF.
- 12.Hegedüs L, Noszticzius Z, Papp Á, Schubert A, Wittmann M (1995) ACH-Models in Chemistry 132:207–224Google Scholar
- 13.Noszticzius Z, Schubert A (1973) Periodica Polytechnica 17:165–177Google Scholar
- 14.Schubert A, Noszticzius Z (1977) Periodica Polytechnica 21:279–283Google Scholar