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When Like Charges Attract: Interactions and Dynamics in Charge-Stabilized Colloidal Suspensions

David G. Grier

Abstract:

Measured pair interactions among highly charged colloidal spheres dispersed in simple electrolytes yield several surprises. Isolated pairs of like-charged spheres are found to repel each other, much as predicted by conventional theory. The same spheres, however, can develop a strong and long-ranged attraction for each other when confined either by charged glass walls, or by neighboring spheres. Such like-charge attractions are inconsistent with the mean field theory for macroionic interactions. These and other experimental observations further constrain recently proposed extensions to the mean field theory.





David G. Grier
1999-07-23