Fig. 3. Diffusioosmosis of a monovalent electrolyte with ion diffusivity ratio β = −0.5. The channel surface charge density q = −0.014 C m⁻² corresponds to a channel surface potential ζ = −100 mV at a bulk electrolyte molar concentration C = 10⁻³ M. Panels (a), (c), and (e) ignore ion–ion electrostatic correlations (δ_c = 0). Panels (b), (d), and (f) account for electrostatic correlations (δ_c = κl_c). (a) and (b): The diffusioosmotic mobility M̂ versus C. (c) and (d): The space charge density versus the distance from the bottom channel wall ŷ at C = 1 M. (e) and (f): The diffusioosmotic velocity û versus ŷ at C = 1 M. For (a), (b), (e) and (f), the black line denotes a slip length b̂ = 0, the grey line denotes b̂ = 10⁻², the blue line denotes b̂ = 10⁻¹, and the red line denotes b̂ = 1. For (c) and (d), is independent of b̂.