Surface modification of clay minerals by organic polyions

E. Tombácz, M. Szekeres, L. Baranyi, E. Michéli

Research output: Contribution to journalConference article

66 Citations (Scopus)


Parallel studies were made of the solid/gas and solid/liquid interfacial properties and the colloidal behaviour of aqueous dispersions of two types of material: soil mineral grains which had been coated with natural organic matter (humus) and clay minerals (montmorillonite and kaolinite) whose surfaces had been modified synthetically with an organic polyacid, as models for organo-mineral complexes. Solid samples with and without a polyionic organic coating, and also their aqueous suspensions, were investigated by means of nitrogen gas adsorption, small-angle X-ray scattering, potentiometric acid-base titration and theological methods. The organic coating was found to exist as a rough layer on the surface of the mineral grains, and to plug their pores. Both the natural and the synthetic surface modification resulted in steric and electrostatic stabilization of the clay particles, because of the highly charged, polyionic character of the surface-modifying organic matter.

Original languageEnglish
Pages (from-to)379-384
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Issue number3
Publication statusPublished - Nov 15 1998
EventProceedings of the 1996 7th Conference on Colloid Chemistry in Memoriam to A. Buzagh - Eger, Hung
Duration: Sep 23 1997Sep 26 1997



  • Humus coating
  • Organic surface modification
  • Organo-mineral complexes
  • Rheology
  • Soil colloids
  • Surface charge titration

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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