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Monte Carlo simulations were employed to study two negative rods confinedbetween two parallel plates. The system is immersed in a 1-1 restrictedprimitive model electrolyte. Ion distributions and forces per unit of area(pressures) on rods and plates are accessed by sampling the NVT ensemble.Pressures are analyzed by means of their corresponding electric and contact(depletion) contributions. This was done for several charge distributions onplates, plates charge densities, and plate-plate surface separation distances.We found an enhancement of the inherent repulsive rod-rod effective force whenuncharged plates are the confining species. On the contrary, a strong decreaseof the rod-rod effective repulsion was obtained for positively charged plates.Moreover, attraction was also found for plates having a charge equal to that offully charged bilipid bilayers. These results agree with DNA-phospholipidcomplexation experiments. On the other hand, for a model having the platescharges fixed on a grid, very long range rod-rod sin-like effective forces wereobtained. As explained in the text, they are a consequence of the rod-platedouble layer coupling.

Two rods confined by positive plates: Effective forces and charge distribution profiles