Surface modification of clay minerals by organic polyions

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

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

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
Volume141
Issue number3
DOIs
Publication statusPublished - Nov 15 1998

Fingerprint

Clay minerals
clays
Minerals
Surface treatment
Organic coatings
minerals
Biological materials
Bentonite
Kaolin
Gas adsorption
Kaolinite
X ray scattering
Titration
Dispersions
coatings
kaolinite
Electrostatics
Suspensions
Clay
Nitrogen

Keywords

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

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Surface modification of clay minerals by organic polyions. / Tombácz, E.; Szekeres, M.; Baranyi, L.; Michéli, E.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 141, No. 3, 15.11.1998, p. 379-384.

Research output: Contribution to journalArticle

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