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We study salt-induced charge overcompensation and charge inversion offlexible polyelectrolytes via computer simulations and demonstrate theimportance of ion excluded volume. Reentrant condensation takes place when theion size is comparable to monomer size, and happens in a middle region of saltconcentration. In a high-salt region, ions can overcharge a chain near itssurface and charge distribution around a chain displays an oscillatorybehavior. Unambiguous evidence obtained by electrophoresis shows that chargeinversion does not necessarily appear with overcharging and occurs when the ionsize is not big. These findings suggest a disconnection of resolubilization ofpolyelectrolyte condensates at high salt concentration with charge inversion.

the journal of physical chemistry. b

Overcharging, charge inversion and reentrant condensation: Using  highly-charged polyelectrolytes in tetravalent salt solutions as an example  of study