In previous works, we have shown that the ionic excluded volume and the ionic size-asymmetry may promote an overcompensation of the bare colloidal charge of a single macroion by counterions, or the so-called charge reversal, and may also induce a local augment of the net charge near the surface of a single macroion exceeding its bare colloidal charge, which is the so-called surface charge amplification, in concentrated supporting electrolytes. In this work, we show that large values of local charge reversal and charge amplification may appear in a suspension of big macroions and small monovalent ions with particle size-asymmetries of 250:1. A novel theoretical approach to describe the corresponding effective interactions between the macroions is also presented.

Giant charge reversal and charge amplification with monovalent ions in highly size-asymmetric colloidal suspensions

247th National Meeting (2014)

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