A comparative study on the effect of hydrodynamic interactions in the non-sequential deposition of concentrated colloidal dispersions: stochastic rotation dynamics and Brownian dynamics simulations |
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| Authors: | Cesar-Augusto Pérez Arturo Moncho-Jordá Roque Hidalgo-Álvarez Herley Casanova |
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| Affiliation: | 1. Colloids Group, Institute of Chemistry, University of Antioquia, Medellín, Colombiaaugusto.perez@udea.edu.co;3. Biocolloid and Fluid Physics Group, Applied Physics Department, University of Granada, Granada, Spain;4. Colloids Group, Institute of Chemistry, University of Antioquia, Medellín, Colombia |
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| Abstract: | Irreversible adsorption of particles onto a flat surface as a consequence of sedimentation colloidal suspension has been studied by two simulation techniques: Brownian dynamics (BD) and stochastic rotation dynamics (SRD). The purpose of using both methods is to investigate the effect of hydrodynamic interactions on adsorption kinetics and structure of the first monolayer of sediment obtained from the sedimentation of a concentrated and monodisperse colloidal suspension. Three systems were studied, characterised by the Péclet numbers: 0.1, 1.0 and 10. To physically understand the kinetic behaviour, simulation results were analysed using a kinetic model based on chemical reactions. High values of jamming limit (θ∞ > 0.61) were obtained for both simulation techniques, with the SRD showing the highest figures (0.631) due to the hydrodynamics effect that takes into account the fluid backflow produced on particle sedimentation. A two-step adsorption mechanism was proposed based on the observed kinetic behaviour. |
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| Keywords: | stochastic rotation dynamics hydrodynamics sedimentation monolayer formation kinetic model |
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