Electrostatic image effects for counter-ions between charged planar walls

Details Electrostatic image effects for counter-ions between charged planar walls Electrostatic image effects for counter-ions between charged planar walls

2007-02-13

arxiv.org/abs/cond-mat/0702300v1

Eur. Phys. J. E 23, 265-274 (2007)

Physics

Condensed Matter

Soft Condensed Matter

21 pages, 8 figures

Scientific paper

10.1140/epje/i2007-10187-2

We study the effect of dielectric inhomogeneities on the interaction between two planparallel charged surfaces with oppositely charged mobile charges in between. The dielectric constant between the surfaces is assumed to be different from the dielectric constant of the two semiinfinite regions bounded by the surfaces, giving rise to electrostatic image interactions. We show that on the weak coupling level the image charge effects are generally small, making their mark only in the second order fluctuation term. However, in the strong coupling limit, the image effects are large and fundamental. They modify the interactions between the two surfaces in an essential way. Our calculations are particularly useful in the regime of parameters where computer simulations would be difficult and extremely time consuming due to the complicated nature of the long range image potentials.

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