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A more accurate fluctuation potential problem is considered in the modified Poisson–Boltzmann theory. Numerical solutions of the resulting new equation are compared with those of the previous theory and 1 : 1, 1 : 2, 2 : 2 Monte Carlo calculations. The new modified Poisson–Boltzmann equation is found to be much more successful in predicting the Monte Carlo results, especially for the higher-valency electrolytes.
Outhwaite et al. (Sat,) studied this question.