Colloidal sedimentation (and filtration)

Significant progress has been made in the understanding of various aspects of the processes of sedimentation and filtration of (mixtures of) colloidal spheres. These aspects include the hydrodynamic friction and the equation of state over a wide range of particle densities, the strongly hindered settling for charged spheres with long-range repulsions, and spontaneous layer formation. For nonspherical colloids, many issues, such as the sedimentation dynamics of interacting rods or platelets, are still unresolved.