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The derivative of the electrostatic free energy predicted by the uniform ion size-modified Poisson-Boltzmann equation with respect to the logarithm of the bulk concentration of 1:1 salt, −dFSMPBE / d log(cb), as a function of the ion radius, rion, and the equivalent quantity predicted by the classical nonlinear Poisson-Boltzmann equation, −dFNLPBE / d log(cb), as a function of the thickness of the Stern layer.
