Attractive Interaction between Similarly Charged Colloidal Particles

The pair interactions between the charged colloidal particles dispersed in a solvent are studied theoretically by the integral equation method. The pair potential of the mean forces, accounting for the effective pair interaction between colloidal particles, is calculated from the solution of the Orn...

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Bibliographic Details
Published in:Journal of colloid and interface science 1996-12, Vol.184 (1), p.268-278
Main Authors: Chu, Xiaolin, Wasan, Darsh T.
Format: Article
Language:English
Subjects:
attractive interaction
charge
Chemistry
Colloidal state and disperse state
colloids
Coulombic
Exact sciences and technology
General and physical chemistry
Physical and chemical studies. Granulometry. Electrokinetic phenomena
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Summary:The pair interactions between the charged colloidal particles dispersed in a solvent are studied theoretically by the integral equation method. The pair potential of the mean forces, accounting for the effective pair interaction between colloidal particles, is calculated from the solution of the Ornstein–Zernike equation with the mean spherical approximation (MSA). An attractive interaction was found between two similarly charged colloidal particles in contrast with the purely repulsive force predicted by the Debye–Huckel theory. Such an attractive interaction provides physical insight for the “condensed” phenomena in charged colloidal dispersions, that is, the coexistence of a “condensed” phase and an “expanded” phase (voids). At the higher concentration and charge on colloidal particles, the effective pair interaction becomes oscillatory.
ISSN:0021-9797
1095-7103
DOI:10.1006/jcis.1996.0620