Figure 2.

Disjoining pressures operating between two similarly charged surfaces separated by a 2:1 electrolyte solution predicted using the BSK (eq 21) and the PB (eq 22) models for q_s = −0.1 C/m², c₀ = 0.1 M, and ϵ_r = 80. (a) Variation of the disjoining pressure as a function of the separation distance between the two charged surfaces. The inset shows the contribution of the different terms in eq 21 based on the BSK model. (b,c) Comparison of the charge density and the dimensionless electrostatic potential profiles, respectively, predicted by the BSK model (eq 11) and the PB model (eq 11 with δ_c set to zero) when the separation distance between the two charged surfaces is 1 nm, and where x is the spatial coordinate perpendicular to the plane of the charged surface.