Electrical double layer interactions with image charges

✍ Scribed by Dušan Bratko; Bo Jönsson; Håkan Wennerström

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 578 KB
• Volume: 128
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(86)80652-2

✦ Synopsis

Monte Carlo simulations have been performed to study the interaction between two electrical double layers. Each double layer has the form of a planar charged wall carrying a uniformly smeared-out surface charge density and neutralizing counterions, which are free to move between the walls. Dielectric discontinuities have been taken into account by means of image charges. Recent simulations and integral equation theories have shown mean field theory to be qu~~tively incorrect. The inclusion of image charges tends to increase this discrepancy, and it also increases the attraction between the double layers at high surface charge densities. On the other hand, at low surface charge density the presence of d~con~uities leads to a stronger repulsion between the double layers than predicted by mean field theory. The calculated forces and concentration profiles are sensitive to the location of the dielectric discontinuities.