Theory of charge asymmetric electrolytes. Onsager’s approach revisited

Onsager made corrections to the Poisson–Boltzmann equation, more correctly describe interactions in asymmetric electrolytes (those which have different charges, absolute value, for cation and anion). The equations established by allow calculation of symmetric total correlation functions, such that hij(r)=hji(r). In this article it has been shown these describing particular electrolytes, can also be deduced from Ornstein Zernicke integral considering a nonlinear closure relation HNC type. excess free energy functions found similar obtained Mayer’s theory. Relations with electrostatic association models on one hand, dressed ions theory other are recovered.