Institute of Fundamental Technological Research
Polish Academy of Sciences

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G. Nagele



Conference abstracts
1.  Abade G.C., Cichocki B., Ekiel-Jeżewska M.L., Nagele G., Wajnryb E., Diffusion, sedimentation, and rheology of concentrated suspensions of core-shell particles, III National Conference of Nano and Micromechanics, 2012-07-04/07-06, Warszawa (PL), pp.79-80, 2012

Abstract:
Short-time dynamic properties of concentrated suspensions of colloidal core-shell particles have been recently studied [1] using a precise force multipole method which accounts for many-particle hydrodynamic interactions (HIs). A core-shell particle is composed of a rigid, spherical dry core of radius a surrounded by an uniformly permeable shell of outer radius b and hydrodynamic penetration depth κ-1. The solvent flow inside the permeable shell is described by the Brinkman-Debye-Bueche equation, and outside the particles by the Stokes equation. The particles are assumed to interact non-hydrodynamically by a hard-sphere no-overlap potential of radius b. Numerical results are presented for the high-frequency shear viscosity, sedimentation coefficient and the short-time translational and rotational self-diffusion coefficients. The simulation results cover the full three-parametric fluid-phase space of the composite particle model, with the volume fraction extending up to 0.45, and the whole range of values for κb, and a/b. Many-particle hydrodynamic interaction effects on the transport properties are explored, and the hydrodynamic influence of the core in concentrated systems is discussed.

Keywords:
Stokes equations, Brinkman-Debye-Bueche equations, permeable particles, translational and rotational self-diffusion, sedimentation, effective viscosity

Affiliations:
Abade G.C. - Universidade de Brasilia (BR)
Cichocki B. - University of Warsaw (PL)
Ekiel-Jeżewska M.L. - IPPT PAN
Nagele G. - other affiliation
Wajnryb E. - IPPT PAN

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