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- W2949860160 abstract "We 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 $phi$. For dilute suspensions of strongly charged spheres at low salinity, $U/U_{0}$ is well represented by the parametric form $1-pphi^alpha$ with a fractional exponent $alpha=1/3$ and a parameter $psimeq 1.8$, 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 $phi$-dependent diameter. For weakly charged spheres in a deionized solvent, we show that the exponent $alpha$ 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 $phi$ 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." @default.
- W2949860160 created "2019-06-27" @default.
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- W2949860160 date "1999-03-05" @default.
- W2949860160 modified "2023-09-26" @default.
- W2949860160 title "Sedimentation of strongly and weakly charged colloidal particles: Prediction of fractional density dependence" @default.
- W2949860160 hasPublicationYear "1999" @default.
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