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The adsorption of charged colloids (macroions) onto an oppositely chargedplanar substrate is investigated theoretically. Taking properly into accountthe finite size of the macroions, unusual behaviors are reported. It is foundthat the role of the coions (the little salt-ions carrying the same sign ofcharge as that of the substrate) is crucial to understand the mechanismsinvolved in the process of macroion adsorption. In particular, the coions canaccumulate near the substrate's surface and lead to a counter-intuitive {\itsurface charge amplification}.

Macroion adsorption: The crucial role of excluded volume and coions