The extent of the electrical double layer surrounding a charged colloid is a measure of the neutralization of the bare or native colloidal charge and determines the colloidal stability properties of these macroparticles in solution. The effects of characteristic properties of Coulombic fluids in the electrical double layer have been widely studied in numerous experimental, theoretical, and simulation studies.1 In particular, some of the present authors have shown that the electrical double layer can experience a peculiar shrinking and expansion in the presence of molten salts and simple charge-asymmetric electrolytes if coions are multivalent.2,3 This observation was performed via simulation and theory by calculating the capacitive compactness of the electrical double layer.2–4 By considering the global electroneutrality of an electrode–electrolyte system, it is possible to replace the real system by an effective capacitor in which the diffuse electrical double layer charge is placed in an electrode with...

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