Viscosity and diffusion in hard-sphere-like colloidal suspensions

E.G.D. Cohen, R. Verberg and I.M.de Schepper

Physica A: Statistical Mechanics and its Applications, 1998, vol. 251, issue 1, 251-265

Abstract: A large number of experimental data on the viscous and the diffusive behavior at short and long times in three classes of disordered hard-sphere-like colloidal suspensions with varying polydispersity is compared with theory. At low and intermediate concentrations (volume fraction φ<0.35) a hydrodynamic description obtains. An alternative molecular approach, which can be generalized to high concentrations, is also presented. At high concentrations (φ>0.35) the dominant contributions, however, come from direct interactions in cage diffusion, whose rapidly increasing difficulty with increasing concentration, leads to a singularity-dominated increase (decrease) of the viscosity (self- and collective diffusion coefficient).

Keywords: Viscosity; Diffusion; Colloidal suspensions; Hard-spheres; Polydispersity (search for similar items in EconPapers)
Date: 1998
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:251:y:1998:i:1:p:251-265

DOI: 10.1016/S0378-4371(97)00609-2

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