Pattern forming precipitation in gels due to coupling of chemical reactions with diffusion

E. Kárpáti-Smidróczki, A. Büki, M. Zrínyi

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Precipitate-forming chemical reactions have been studied in chemically cross-linked poly(vinyl alcohol) gel medium. One of the reactive components was incorporated into the gel, the other was allowed to diffuse into it. Depending on the experimental conditions the reaction-diffusion process often results in patterns of different type. Experiments performed in tubes and in thin layers were carried out in order to investigate the effects of various factors (cross-linking density, swelling degree as well as the concentrations of the outer and inner electrolytes) on the morphologies of the precipitate patterns. It was found that precipitation occurs not only in the Liesegang bands, but also between bands. Beside Liesegang-type structures, tree-like patterns have been observed, showing a characteristic periodicity in the density profile obtained by digitalized image analyses.

Original languageEnglish
Pages (from-to)857-865
Number of pages9
JournalColloid & Polymer Science
Volume273
Issue number9
DOIs
Publication statusPublished - Sep 1 1995

Keywords

  • Liesegang bands
  • Poly(vinyl-alcohol) gel medium
  • cross-linking density

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

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