Solvent mediated interactions close to fluid-fluid phase separation: microscopic treatment of bridging in a soft core fluid

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dc.creatorArcher, A. J.
dc.creatorEvans, R.
dc.creatorRoth, R.
dc.creatorOettel, M.
dc.date2004-11-22
dc.date.accessioned2026-07-07T03:02:16Z
dc.date.available2026-07-07T03:02:16Z
dc.descriptionUsing 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.
dc.description28 pages, 8 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0411557
dc.identifierhttp://arxiv.org/abs/cond-mat/0411557
dc.identifierJ. Chem. Phys. 122, 084513 (2005)
dc.identifierdoi:10.1063/1.1855878
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/25333
dc.subjectSoft Condensed Matter
dc.subjectStatistical Mechanics
dc.titleSolvent mediated interactions close to fluid-fluid phase separation: microscopic treatment of bridging in a soft core fluid
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