Gouy-Chapman theory counterion concentration

FIG. 5 Normalized concentration distribution in the pore of Figure 4 but charged with —0.05 C/m. The symbols are the same as in Figure 4, with the cations being the counterions. The anions (coions) of the RPM and SPM model are not distinguishable on the present scale. The dotted line is the prediction of the modified Gouy-Chapman theory and approximates the simulation results of the RPM. 

In the theoretical approaches of Poisson-Boltzmann, modified Gouy-Chapman (MGC), and integral equation theories such as HNC/MSA, concentration or density profiles of counterions and coions are calculated with consideration of the ion-waU and ion-ion in-... 

An increase in salt concentration in the bulk mobile phase provides those counterions which are able to reduce, according to the Gouy-Chapman electrostatic theory, the electrostatic stationary-phase surface potential. Hence, the adsorption of the HR may increase, even if its concentration in the eluent is the same, because of lower electrostatic self -repulsion. However,... 

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