Macroion adsorption: The crucial role of excluded volume and coions

Abstract

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

arXiv comment11 pages - 4 figures. To appear in JCP

References in corpus (5)

• Electrostatic correlations: from Plasma to Biology
• Effective interactions between electric double-layers
• Structure and Dynamics of DNA-dendrimer complexation: Role of counterions, water and base pair sequence
• Overcharging: The Crucial Role of Excluded Volume
• Giant Charge Inversion of a Macroion Due to Multivalent Counterions and Monovalent Coions: Molecular Dynamics Study

Cited by in corpus (4)

• A simulational and theoretical study of the spherical electrical double layer for a size-asymmetric electrolyte: the case of big coions
• On the molecular mechanism of surface charge amplification and related phenomena at aqueous polyelectrolyte-graphene interfaces
• Model charged cylindrical nanopore in a colloidal dispersion: charge reversal, overcharging and double overcharging
• On the improvement of SPT2 approach in the theory of a hard sphere fluid in disordered porous media