Short-time diffusion of charge-stabilized colloidal particles: generic features

Heinen, M.; Banchio, A.J.; Nägele, G.; Holmqvist, P.

doi:10.1107/S002188981002724X

Journal Article

PreJuSER-11196

Short-time diffusion of charge-stabilized colloidal particles: generic features

Heinen, M.FZJ* ; Holmqvist, P.FZJ* ; Banchio, A. J. ; Nägele, G.FZJ*

2010
Munksgaard Copenhagen

Journal of applied crystallography 43, 970 - 980 (2010) [10.1107/S002188981002724X]

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Please use a persistent id in citations: http://hdl.handle.net/2128/4683 doi:10.1107/S002188981002724X

Abstract: Analytical theory and Stokesian dynamics simulations are used in conjunction with dynamic light scattering to investigate the role of hydrodynamic interactions in short-time diffusion in suspensions of charge-stabilized colloidal particles. The particles are modeled as solvent-impermeable charged spheres, repelling each other via a screened Coulomb potential. Numerical results for self-diffusion and sedimentation coefficients, as well as hydrodynamic and short-time diffusion functions, are compared with experimental data for a wide range of volume fractions. The theoretical predictions for the generic behavior of short-time properties obtained from this model are shown to be in full accord with experimental data. In addition, the effects of microion kinetics, nonzero particle porosity and residual attractive forces on the form of the hydrodynamic function are estimated. This serves to rule out possible causes for the strikingly small hydrodynamic function values determined in certain synchrotron radiation experiments.

Keyword(s): J ; diffusion (auto) ; charge-stabilized colloidal particles (auto) ; self-diffusion (auto) ; sedimentation (auto)

Classification:

Crystallography

Note: MH acknowledges support by the International Helmholtz Research School of Biophysics and Soft Matter (IHRS BioSoft). AJB acknowledges financial support from SeCyT-UNC and CONICET. We thank J. Gapinski and A. Patkowski for helpful discussions. This work was supported by funds from the Deutsche Forschungsgemeinschaft (SFB-TR6, project B2).

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