title: Dynamics of permeable particles in concentrated suspensions.
abstract: We calculate short-time diffusion properties of suspensions of porous colloidal particles as a function of their permeability, for the full fluid-phase concentration range. The particles are modeled as spheres of uniform permeability with excluded volume interactions. Using a precise multipole method encoded in the HYDROMULTIPOLE program, results are presented for the hydrodynamic function, H(q) , sedimentation coefficient, and self-diffusion coefficients with a full account of many-body hydrodynamic interactions. While self-diffusion and sedimentation are strongly permeability dependent, the wave-number dependence of the hydrodynamic function can be reduced by appropriate shifting and scaling, to a single master curve, independent of permeability. Generic features of the permeable sphere model are discussed.
authors.affiliation: Institute of Theoretical Physics, University of Warsaw, Hoza 69, 00-681 Warsaw, Poland.
authors.forename: Gustavo C
authors.initials: GC
authors.lastname: Abade
authors.forename: Bogdan
authors.initials: B
authors.lastname: Cichocki
authors.forename: Maria L
authors.initials: ML
authors.lastname: Ekiel-Jezewska
authors.forename: Gerhard
authors.initials: G
authors.lastname: Nägele
authors.forename: Eligiusz
authors.initials: E
authors.lastname: Wajnryb