Surface and capillary transitions in an associating binary mixture model

Details Surface and capillary transitions in an associating binary mixture model Surface and capillary transitions in an associating binary mixture model

2002-12-03

arxiv.org/abs/cond-mat/0212068v2

Physics

Condensed Matter

Statistical Mechanics

12 two-column pages, 12 figures, accepted for publication in Physical Review E; corrected version

Scientific paper

10.1103/PhysRevE.67.041502

We investigate the phase diagram of a two-component associating fluid mixture in the presence of selectively adsorbing substrates. The mixture is characterized by a bulk phase diagram which displays peculiar features such as closed loops of immiscibility. The presence of the substrates may interfere the physical mechanism involved in the appearance of these phase diagrams, leading to an enhanced tendency to phase separate below the lower critical solution point. Three different cases are considered: a planar solid surface in contact with a bulk fluid, while the other two represent two models of porous systems, namely a slit and an array on infinitely long parallel cylinders. We confirm that surface transitions, as well as capillary transitions for a large area/volume ratio, are stabilized in the one-phase region. Applicability of our results to experiments reported in the literature is discussed.

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