Sedimentation of a nonconducting sphere in a spherical cavity
Journal
Journal of Physical Chemistry B
Journal Volume
104
Journal Issue
29
Pages
6815-6820
Date Issued
2000
Author(s)
Abstract
The sedimentation of a nonconducting spherical particle in a spherical cavity is analyzed theoretically. We show that, for the case where the former is positively charged and the latter uncharged, the sedimentation velocity of the particle decreases with £ea, £e and a being respectively the reciprocal Debye length and the radius of a particle. If the surface potential of the particle £p r is high, the sedimentation potential has a local maximum as £ea varies, which becomes inappreciable if the surface potential is low. If £p r is sufficiently high, the sedimentation potential has a local maximum as £f (= radius of particle/radius of cavity) varies. It is not observed, however, if £ea is large. If an uncharged particle is placed in a positively charged cavity, the sedimentation potential may reverse its sign, and may have a local minimum as £ea varies. ? 2000 American Chemical Society.
Type
journal article