Abstract
The sedimentation of concentrated charged spherical particles in an electrolyte solution is investigated theoretically for an arbitrarily thick double layer taking the effect of double-layer polarization into account. We show that the ratio E*/U* (=scaled sedimentation potential per scaled sedimentation velocity) is a constant if κa is either very small or very large, κ and a being respectively the reciprocal Debye length and the radius of a particle. The variation of E*/U* as a function of κa has a minimum at a medium κa. This minimum increases with the increase in particle concentration. The scaled sedimentation velocity approaches a constant if κa is small, and its variation as a function of κa has a maximum at a medium κa. This maximum decreases with the decrease in particle concentration.
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