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    30. Colloidal rod-sphere mixtures: Fluid-fluid interfaces and Onsager limit
    J. M. Brader, A. Esztermann, and M. Schmidt, Phys. Rev. E 66, 031401 (2002).
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    Abstract. Using a geometry-based density functional theory we investigate the free interface between demixed bulk fluid phases of a colloidal mixture of hard spheres and vanishingly thin needles. Results are presented for the spatial and orientational density distributions of the particles, as well as for the interface tension. Density profiles display oscillations on the sphere-rich side of the interface provided the sphere liquid phase is on the oscillatory side of the Fisher-Widom line in the bulk phase diagram. Needles tend to align parallel perpendicular to the interface on the needle-rich (sphere-rich) side displaying biaxial (uniaxial) order. Furthermore, we generalize the theory to the Onsager limit for interacting rods, and give explicit expressions for the functional in simple geometries. [figures]


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    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].

    Rod-sphere mixtures

    The DFT of [19] was extended to treat rod-rod interactions [30] [49], and used for free fluid interfaces [30] and wetting at a hard wall [40]. Simulations [42] confirmed unusual interfacial rod ordering. See [25] for the demixing phase behavior of the system upon adding polymers.

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MS, 20 Apr 2009.