Overscreening in colloidal systems: the attractive branch of pair macroion interaction

The effective pair macroion interaction for colloidal systems, obtained in general form by Trigger, Podloubny and Schram (TPS potential) is considered for the case of a strong Coulomb interaction between the macroion and counterion subsystems of a colloid. For this potential a good agreement with the experiments on the shear modules as function of the volume fraction is found.