Attraction between like-charged colloidal particles induced by a surface   a density - functional analysis
  We show that the first non-linear correction to the linearised Poisson-Boltzman n (or DLVO) theory of effective pair interactions between charge-stabilised, co lloidal particles near a charged wall leads to an attractive component of entro pic origin. The position and depth of the potential compare favourably with rec ent experimental measurements 
David Goulding and Jean-Pierre Hansen