Sedimentation of strongly and weakly charged colloidal particles: Prediction of fractional density dependence

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dc.creatorWatzlawek, M.
dc.creatorNaegele, G.
dc.date1999-03-05
dc.date1999-07-09
dc.date.accessioned2026-07-07T03:12:57Z
dc.date.available2026-07-07T03:12:57Z
dc.descriptionWe report on calculations of the reduced sedimentation velocity $U/U_{0}$ in homogenous suspensions of strongly and weakly charged colloidal spheres as a function of particle volume fraction $ϕ$. For dilute suspensions of strongly charged spheres at low salinity, $U/U_{0}$ is well represented by the parametric form $1-pϕ^α$ with a fractional exponent $α=1/3$ and a parameter $p\simeq 1.8$, which is essentially independent from the macroion charge $Z$. This non-linear volume fraction dependence can be quantitatively understood in terms of a model of effective hard spheres with $ϕ$-dependent diameter. For weakly charged spheres in a deionized solvent, we show that the exponent $α$ can be equal to 1/2, if an expression for $U/U_0$ given by Petsev and Denkov [J. Colloid Interface Sci. 149, 329 (1992)] is employed. We further show that the range of validity of this expression is limited to very small values of $ϕ$ and $Z$, which are probably not accessible in sedimentation experiments. The presented results might also hold for other systems like spherical proteins or ionic micelles.
dc.description15 pages and 8 figures, final version as published
dc.identifierhttps://arxiv.org/abs/cond-mat/9903098
dc.identifierhttp://arxiv.org/abs/cond-mat/9903098
dc.identifierJournal of Colloid and Interface Science 214, 170 (1999)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/29114
dc.subjectSoft Condensed Matter
dc.titleSedimentation of strongly and weakly charged colloidal particles: Prediction of fractional density dependence
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