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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Editor-in-Chief: Rademann, Klaus

12 Issues per year

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5-year IMPACT FACTOR: 1.144

CiteScore 2017: 1.08

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Volume 226, Issue 7-8


Charging and Aggregation of Positively Charged Colloidal Latex Particles in Presence of Multivalent Polycarboxylate Anions

Amin Sadeghpour / István Szilágyi / Michal Borkovec
Published Online: 2012-07-25 | DOI: https://doi.org/10.1524/zpch.2012.0259


Colloidal stability and charging behavior of amidine latex particles in the presence of multivalent oligomers of acrylic acid was investigated by electrophoresis and light scattering. The data were interpreted quantitatively with the theory of Derjaguin, Landau, Verwey and Overbeek (DLVO) whereby the surface potentials were estimated from electrophoresis. Monomer leads to slow aggregation at low concentrations and to rapid aggregation at high concentrations, as characteristic for simple salts. The oligomers induce a charge reversal of the particles. Close to the isoelectric point (IEP) aggregation is rapid while the suspension becomes stable away from this point. At high oligomer concentrations, the aggregation becomes rapid again. The agreement between DLVO theory and experiment is good close to the IEP. At higher oligomer concentrations, the theory predicts larger stabilities than observed experimentally. While inter-particle forces seem to be well described by DLVO theory near the IEP, additional attractive non-DLVO forces are becoming relevant at higher concentrations.

Keywords: Light Scattering; Electrokinetics; Latex Particles; Polyacrylic Acid; Multivalent Ions

About the article

* Correspondence address: University of Geneva, Department of Inorganic and Analytical Chemistry, 30 Quai Ernest-Ansermet, Sciences II, 1205 Geneva, Schweiz,

Published Online: 2012-07-25

Published in Print: 2012-08-01

Citation Information: Zeitschrift für Physikalische Chemie, Volume 226, Issue 7-8, Pages 597–612, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1524/zpch.2012.0259.

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