J. Phys. IV France
Volume 10, Numéro PR7, May 2000
International Workshop on Dynamics in Confinement
Page(s) Pr7-295 - Pr7-298
International Workshop on Dynamics in Confinement

J. Phys. IV France 10 (2000) Pr7-295-Pr7-298

DOI: 10.1051/jp4:2000759

On Stokes-Einstein and Debye behaviour in colloidal fluids

G.H. Koenderink and A.P. Philipse

Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute, Utrecht University, Padualaan 8, 3584 Utrecht, The Netherlands

We discuss recent experiments on tracer sphere diffusion in colloidal host suspensions. Stokes-Einstein behaviour (tracer diffusion inversely proportional to host viscosity) is observed at low host viscosities, i.e. the host suspension behaves as an effective fluid. At high host viscosities, however, tracer diffusion decouples from the viscosity and the host suspension behaves more like a static confining geometry.

© EDP Sciences 2000