6533b861fe1ef96bd12c45e3
RESEARCH PRODUCT
Forces between colloidal particles in aqueous solutions containing monovalent and multivalent ions
Michal BorkovecGregor TrefaltThomas Palbergsubject
Materials sciencePolymers and PlasticsFOS: Physical sciencesOptical tweezersDirect force measurement02 engineering and technologyCondensed Matter - Soft Condensed Matter01 natural sciencesDouble layer forcesIonColloid and Surface Chemistry0103 physical sciencesSpecific ion adsorptionDLVO theoryPhysical and Theoretical Chemistry010306 general physicschemistry.chemical_classificationRange (particle radiation)Aqueous solutionSurfaces and Interfaces021001 nanoscience & nanotechnologyColloidal probe techniqueColloidal probe techniqueOptical tweezerschemistryChemical physicsddc:540Soft Condensed Matter (cond-mat.soft)DLVO theoryAFMCounterion0210 nano-technologydescription
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 potentials must be extracted from the force profiles. At low salt concentrations, double layer forces remain repulsive and may become long ranged. At short distances, additional short range non-DLVO interactions may become important. Such an interaction is particularly relevant in the presence of multivalent counterions.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-02-01 | Current Opinion in Colloid & Interface Science |