Diffusion of colloids at short times

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dc.creatorWatzlawek, M.
dc.creatorNaegele, G.
dc.date1997-07-28
dc.date.accessioned2026-07-07T09:11:58Z
dc.date.available2026-07-07T09:11:58Z
dc.descriptionWe study the combined effects of electrostatic and hydrodynamic interactions (HI) on the short-time dynamics of charge-stabilized colloidal spheres. For this purpose, we calculate the translational and the rotational self-diffusion coefficients, $D^t_s$ and $D^r_s$, as function of volume fraction $ϕ$ for various values of the effective particle charge $Z$ and various concentrations $n_s$ of added 1--1 electrolyte. Our results show that the self-diffusion coefficients in deionized suspensions are less affected by HI than in suspensions with added electrolyte. For very large $n_s$, we recover the well-known results for hard spheres, i.e. a linear $ϕ$-dependence of $D^t_s$ and $D^r_s$ at small $ϕ$. In contrast, for deionized charged suspensions at small $ϕ$, we observe the interesting non-linear scaling properties $D^t_s\propto1-a_tϕ^{4/3}$ and $D^r_s\propto 1-a_rϕ^2$. The coefficients $a_t$ and $a_r$ are found to be nearly independent of $Z$. The qualitative differences between the dynamics of charged and uncharged particles can be well explained in terms of an effective hard sphere (EHS) model.
dc.description4 pages, LaTeX, 3 Postscript figures included using epsf
dc.identifierhttps://arxiv.org/abs/cond-mat/9707284
dc.identifierhttp://arxiv.org/abs/cond-mat/9707284
dc.identifierProg. Coll. Polym. Sci. 104, 168 (1997)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/151868
dc.subjectSoft Condensed Matter
dc.titleDiffusion of colloids at short times
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