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Model colloid-polymer mixtures in porous matrices:
density functional versus integral equations M. Schmidt, E. Schöll-Paschinger, J. Köfinger, and G. Kahl, J. Phys.: Condens. Matt. 14, 12099 (2002). Locate in [bare] [illustrated] list. Get [full paper] as pdf. Extract. We test the accuracy of a recently proposed density functional (DF) for a fluid in contact with a porous matrix by considering a model mixture where colloids and matrix particles are represented by hard spheres and polymers by ideal spheres. We treat effective Asakura-Oosawa pair potential with an integral-equation theory and find that partial pair correlation functions from both theories are in good agreement with our computer simulation results, and that the theoretical results for the demixing binodals compare well, provided the effect of many-body interactions is not too large. [more]  Read the [full paper] as pdf. |
Fluids in random media
The density functional theory for quenched-annealed mixtures [24] relates the quenched components to a random porous medium and the annealed components model to an adsorbate fluid (mixture). See [46] for the explicit relation to the the replica trick. Colloid-polymer mixtures were studied in bulk random matrices [32], exhibiting (gas-liquid) interfaces [41], and wetting properties at porous substrates [56]. Rods were immersed in quenched sphere matrices [54], and spheres were immersed in random fibre networks [39]. Freezing is hindered in the presence of disorder [38]. See [33] for the related non-equilibrium process of random sequential adsorption.[more]