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Scientific article
English

Forces between colloidal particles in aqueous solutions containing monovalent and multivalent ions

Published inCurrent Opinion in Colloid & Interface Science, vol. 27, p. 9-17
Publication date2017
Abstract

The present article provides an overview of the recent progress in the direct force measurements between individual pairs of colloidal particles in aqueous salt solutions. Results obtained by two different techniques are being highlighted, namely with the atomic force microscope (AFM) and optical tweezers. One finds that the classical theory of Derjaguin, Landau, Verwey, and Overbeek (DLVO) represents an accurate description of the force profiles even in the presence of multivalent ions, typically down to distances of few nanometers. However, the corresponding Hamaker constants and diffuse layer potentialsmust be extracted fromthe force profiles. At low salt concentrations, double layer forces remain repulsive and can be long ranged. At short distances, additional short range non-DLVO interactionsmay become important. Such an interaction is particularly relevant in the presence of multivalent counterions.

Keywords
  • AFM
  • Direct force measurement
  • Colloidal probe technique
  • Optical tweezers
  • DLVO theory
  • Specific ion adsorption
Research group
Citation (ISO format)
TREFALT, Gregor, PALBERG, Thomas, BORKOVEC, Michal. Forces between colloidal particles in aqueous solutions containing monovalent and multivalent ions. In: Current Opinion in Colloid & Interface Science, 2017, vol. 27, p. 9–17. doi: 10.1016/j.cocis.2016.09.008
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Article (Published version)
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ISSN of the journal1359-0294
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