Abstract
Three-component electroneutral systems of finite-size classical macroions with two different charge numbers Z 1 ≫ 1 and Z 2 ≫ 1 and point-like oppositely charged microions are analyzed. Free energy of a mixture of two sorts of macroions is estimated within the Wigner–Seitz cells approximation. The non-linear screening effect is taken into account via the Poisson–Boltzmann approximation within the both cells. The equality of microions pressures at the boundary between the co-existing cells with the different sorts of macroions is used as an equilibrium condition. The difference between the total Helmholtz free energy in equilibrium is shown in comparison with the situation when the Wigner–Seitz cells with macroions with the different charges have the same volumes.
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