Electrolytic depletion interactions

Details Electrolytic depletion interactions Electrolytic depletion interactions

1999-07-14

arxiv.org/abs/cond-mat/9907209v1

Physics

Condensed Matter

Soft Condensed Matter

17 pages, 4 Postscript figures, submitted to Physical Review E

Scientific paper

10.1103/PhysRevE.60.6549

We consider the interactions between two uncharged planar macroscopic surfaces immersed in an electrolyte solution which are induced by interfacial selectivity. These forces are taken into account by introducing a depletion free-energy density functional, in addition to the usual mean-field Poisson-Boltzmann functional. The minimization of the total free-energy functional yields the density profiles of the microions and the electrostatic potential. The disjoining pressure is obtained by differentiation of the total free energy with respect to the separation of the surfaces, holding the range and strength of the depletion forces constant. We find that the induced interaction between the two surfaces is always repulsive for sufficiently large separations, and becomes attractive at shorter separations. The nature of the induced interactions changes from attractive to repulsive at a distance corresponding to the range of the depletion forces.

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