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We report on calculations of the translational and rotational short-timeself-diffusion coefficients $D^t_s$ and $D^r_s$ for suspensions ofcharge-stabilized colloidal spheres. These diffusion coefficients are affectedby electrostatic forces and many-body hydrodynamic interactions (HI). Ourcomputations account for both two-body and three-body HI. For strongly chargedparticles, we predict interesting nonlinear scaling relations $D^t_s\propto1-a_t\phi^{4/3}$ and $D^r_s\propto 1-a_r\phi^2$ depending on volume fraction$\phi$, with essentially charge-independent parameters $a_t$ and $a_r$. Thesescaling relations are strikingly different from the corresponding results forhard spheres. Our numerical results can be explained using a model of effectivehard spheres. Moreover, we perceptibly improve the known result for $D^t_s$ ofhard sphere suspensions.Comment: 8 pages, LaTeX, 3 Postscript figures included using eps

Self-diffusion coefficients of charged particles: Prediction of nonlinear volume fraction dependence