TL;DR
This paper investigates the interaction potential between two polyions in colloidal suspensions, revealing that while they are repulsive at large distances, short-range correlations induce an effective attraction.
Contribution
It demonstrates the conditions under which counterion correlations lead to attraction between polyions, highlighting the role of screening effects at different separations.
Findings
At large separations, interactions are purely repulsive.
Counterion correlations at short distances induce attraction.
Induced attractions are doubly screened at large separations.
Abstract
We study the interaction potential between two polyions inside a colloidal suspension. It is shown that at large separation the interaction potential is purely repulsive, with the induced attractive interactions being doubly screened. For short separations the condensed counterions become correlated, what leads to an effective attraction between the two macromolecules.
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