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The wetting of planar solid surfaces by symmetric binary mixtures near bulk gas–liquid coexistence

We investigate the wetting of planar, nonselective solid substrates by symmetric binary mixtures where the attraction strength between like molecules of components A and B is the same, that is ϵAA = ϵBB<0. Mixture properties come about by varying , that is by varying the attraction between a pair of unlike molecules. By means of mean-field lattice density functional calculations we observe a rich wetting behaviour as a result of the interplay between ϵAB and the attraction of fluid molecules by the solid substrate ϵW. In accord with previous studies we observe complete wetting only above the critical end point if the bulk mixture exhibits a moderate to weak tendency to liquid–liquid phase separation even for relatively strong fluid–substrate attraction. However, in this case layering transitions may arise below the temperature of the critical end point. For strongly phase separating mixtures complete wetting is observed for all temperatures along the line of discontinuous phase transitions in the bulk.