Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2004-11-22
J. Chem. Phys. 122, 084513 (2005)
Physics
Condensed Matter
Soft Condensed Matter
28 pages, 8 figures
Scientific paper
10.1063/1.1855878
Using density functional theory we calculate the density profiles of a binary solvent adsorbed around a pair of big solute particles. All species interact via repulsive Gaussian potentials. The solvent exhibits fluid-fluid phase separation and for thermodynamic states near to coexistence the big particles can be surrounded by a thick adsorbed `wetting' film of the coexisting solvent phase. On reducing the separation between the two big particles we find there can be a `bridging' transition as the wetting films join to form a fluid bridge. The potential between the two big particles becomes long ranged and strongly attractive in the bridged configuration. Within our mean-field treatment the bridging transition results in a discontinuity in the solvent mediated force. We demonstrate that accounting for the phenomenon of bridging requires the presence of a non-zero bridge function in the correlations between the solute particles when our model fluid is described within a full mixture theory based upon the Ornstein-Zernike equations.
Archer Andrew J.
Evans Robert
Oettel Martin
Roth Raphael
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