Tracer diffusion in colloidal suspensions under dilute and crowded conditions with hydrodynamic interactions

We consider tracer diffusion in colloidal suspensions under solid loading conditions, where hydrodynamic interactions play an important role. To this end, we carry out computer simulations based on the hybrid stochastic rotation dynamics-molecular dynamics (SRD-MD) technique. Many details of the sim...

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Bibliographic Details
Published in:The Journal of chemical physics 2012-07, Vol.137 (1), p.014503-014503
Main Authors: Tomilov, A, Videcoq, A, Chartier, T, Ala-Nissilä, T, Vattulainen, I
Format: Article
Language:English
Subjects:
Diffusion
Hydrodynamics
Molecular Dynamics Simulation
Rotation
Suspensions
Temperature
Time Factors
Viscosity
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Summary:We consider tracer diffusion in colloidal suspensions under solid loading conditions, where hydrodynamic interactions play an important role. To this end, we carry out computer simulations based on the hybrid stochastic rotation dynamics-molecular dynamics (SRD-MD) technique. Many details of the simulation method are discussed in detail. In particular, our choices for the SRD-MD parameters and for the different scales are adapted to simulating colloidal suspensions under realistic conditions. Our simulation data are compared with published theoretical, experimental and numerical results and compared to Brownian dynamics simulation data. We demonstrate that our SRD-MD simulations reproduce many features of the hydrodynamics in colloidal fluids under finite loading. In particular, finite-size effects and the diffusive behavior of colloids for a range of volume fractions of the suspension show that hydrodynamic interactions are correctly included within the SRD-MD technique.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.4731661