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Viscosity and diffusion in hard-sphere-like colloidal suspensions

Author

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

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).

Suggested Citation

  • Cohen, E.G.D. & Verberg, R. & Schepper, I.M.de, 1998. "Viscosity and diffusion in hard-sphere-like colloidal suspensions," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 251(1), pages 251-265.
    • Handle: RePEc:eee:phsmap:v:251:y:1998:i:1:p:251-265
    DOI: 10.1016/S0378-4371(97)00609-2
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