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Floating liquid phase in sedimenting colloid-polymer mixtures M. Schmidt, M. Dijkstra, and J.-P. Hansen, Phys. Rev. Lett. 93, 088303 (2004). Locate in [bare] [illustrated] list. Get [full paper] as pdf. Extract. We investigate sedimentation equilibria of colloid-polymer mixtures. When the ratio of buoyant masses of the two species is comparable to the ratio of differences in density of the coexisting bulk (colloid) gas and liquid phases, a stable "floating liquid" phase is found, i.e., a thin layer of liquid sandwiched between upper and lower gas phases. [more]  Read the [full paper] as pdf. |
Colloid-polymer mixtures
The density functional theory for the Asakura-Oosawa model of colloid-polymer mixtures [11] was used to find the "floating liquid" phase [52]. Phew, I am exhausted! All these relations drive me crazy.. See [29] for an investigation of bulk fluid phases. See [22] for an answer to the question whether effective interactions depend on the choice of coordinates.Colloid-polymer mixtures: Beyond the AOV model
Extensions include taking into account an explicit solvent of point particles [27], penetrability of (small) colloids into polymers [28], colloid-induced polymer compression [31], the influence of polymer interactions on fluid-demixing [34] and on the contact angle of the colloidal liquid-gas interface and a hard wall [50], as well as the stability of the floating liquid phase in sedimenting colloid-polymer mixtures for non-ideal polymers [52].Fluid interfaces
Colloid-polymer mixtures display fluid-fluid interfaces [21] [44], relevant for laser-induced condensation [35], capillary condensation [43] and evaporation [48], immersion in porous media [41], the appearance of the floating liquid phase [52], the competition between sedimentation and phase coexistence [51], tension at a substrate [45], the experimental observation of thermal capillary waves [47], and the contact angle of the liquid-gas interface and a wall [50]. In colloidal rod-sphere mixtures fluid-fluid interfaces were investigated with theory [30] and simulation [42]. Hard sphere fluids were considered at surfaces of porous media [37], in random fiber networks [39], and in one dimensional cases [46].[more]