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Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
Generically Dependent Continuant
Simulational and theoretical study of the spherical electrical double layer for a size-asymmetric electrolyte: The case of big coions
Monte Carlo simulations of a spherical macroion, surrounded by a size-asymmetric electrolyte in the primitive model, were performed. We considered 1:1 and 2:2 salts with a size ratio of 2 (i.e., with coions twice the size of counterions), for several surface charge densities of the macrosphere. The radial distribution functions, electrostatic potential in all the space and at the Helmholtz surfaces, and integrated charge are reported. We compare these simulational data with original results obtained from the Ornstein-Zernike integral equation, supplemented by the hypernetted chain-hypernetted chain (HNC-HNC) and hypernetted chain-mean spherical approximation (HNC-MSA) closures, and with the corresponding calculations using the modified Gouy-Chapman and unequal-radius modified Gouy-Chapman theories. The HNC-HNC and HNC-MSA integral equations formalisms show good concordance with Monte Carlo experiments, whereas the notable limitations of point-ion approaches are evidenced. Most importantly, the simulations confirm our previous theoretical predictions of the nondominance of the counterions in the size-asymmetric spherical electrical double layer, the appearance of anomalous curvatures at the outer Helmholtz plane, and the enhancement of the charge reversal and screening at high colloidal surface charge densities due to the ionic size asymmetry. © 2009 The American Physical Society.
Asymmetric electrolytes; Charge reversal; Colloidal surface charge; Counterions; Electrical double layers; Electrostatic potentials; Helmholtz; Hyper netted chains; Integrated charge; Ionic sizes; Mean spherical approximation; Modified gouy-chapman; MONTE CARLO; Monte Carlo Simulation; Ornstein-Zernike integral equations; Primitive model; Radial distribution functions; Size ratio; Spherical macroions; Theoretical prediction; Theoretical study; Charged particles; Computer simulation; Electric properties; Electrolytes; Integral equations; Monte Carlo methods; Spheres; Surface charge; Distribution functions
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