Acid-base diodes in a hydrogel medium. Nonlinear response for mono- and divalent contaminating ions: Theory and experiments

N. Kirschner, P. L. Simon, M. Wittmann, Z. Noszticzius, J. Merkin

Research output: Contribution to journalArticle

5 Citations (Scopus)


Small hydrogel cylinders connecting aqueous solutions of a strong acid and a strong base show a current-voltage characteristic similar to that of a semiconductor diode. This characteristic is affected by adding a salt either to the acid or to the base and the response is highly nonlinear close to certain critical salt concentrations. Theoretical characteristics derived from the Nernst-Planck equations agree qualitatively with the experimental observations for moderate salt concentrations. Applying higher salt concentrations, however, deviations can be observed which are similar in character for both mono- and divalent contaminating ions. The results suggest that the deviation from the theoretical behaviour is not due to ion specific properties, but rather it is caused by the hydrogel medium itself.

Original languageEnglish
Pages (from-to)167-173
Number of pages7
JournalMacromolecular Symposia
Publication statusPublished - Dec 1 2000


ASJC Scopus subject areas

  • Condensed Matter Physics
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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