Figure 3.

Properties of EDL with rigid rod-like lipid head groups in contact with counterions only. (a) Electrostatic potential profiles Ψ, (b) concentration profiles of counterions n, and (c) probability densities of the middle charge q₁ for the rigid rod-like head groups W. The lengths of the head groups are l₁ = l₂ = 0.5 nm (red lines) and l₁ = l₂ = 1 nm (green lines). Results are given for two surface areas per lipid molecule (the two charge densities of the interface): a = 0.6 nm² (full lines, high charge regime) and a = 6 nm² (dashed lines, low charge regime). Only counterions are in the solution, and β = 0.5. MC simulations: a = 6 nm² (open squares) and a = 0.6 nm² (open circles). The system is electroneutral.