Electrostatic properties of two finite width charged dielectric slabs in water

We study the electrostatic interaction between two like-charged membranes of finite thickness embedded (composed of five parallel dielectric interfaces) in a medium of higher dielectric constant. A generalized SC theory is applied along with extensive Monte-Carlo simulations which applied numerical algorithm based on the image charge method to calculate accurate electrostatic potential or forces. We found the dielectric discontinuity is important in a SC regime. They drive strong counterion crowding in the central region of the inter-surface space upon increasing the solvent/membrane dielectric mismatch and change the membrane interactions from attractive to repulsive at small separations.