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The excess osmotic pressure, ΔΠSMPBE computed using the uniform ion size-modified Poisson-Boltzmann equation, SMPBE, and its derivative with respect to the logarithm of the bulk 1:1 salt concentration, −dFSMPBE / d log(cb), are plotted against ion size rion, where rion, is equal to one half of a, the size of the lattice spacing used in the SMPBE theory.
