Effective attraction between like-charged colloids in a 2D plasma

Details Effective attraction between like-charged colloids in a 2D plasma Effective attraction between like-charged colloids in a 2D plasma

2000-08-14

arxiv.org/abs/cond-mat/0008208v1

Physics

Condensed Matter

Soft Condensed Matter

14 pages, 14 figures, submit to PRE

Scientific paper

10.1103/PhysRevE.63.021402

The existence of attractions between like-charged colloids immersed in ionic solution have been discovered in recent experiments. This phenomenon contradicts the predictions of DLVO theory and indicates a failure of mean field theory. We study a toy model based on a two dimensional one-component plasma, which is exactly soluble at one particular coupling constant. We show that colloidal interaction results from a competition between ion-ion repulsion and longer ranged ion-void attraction.

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