Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 139, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4825261
Keywords
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Funding
- GSRT
- European Union (EU)
- National Science Foundation (NSF) NIRT [CBET 0506701]
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Evanescent wave dynamic light scattering and Stokesian dynamics simulations were employed to study the dynamics of hard-sphere colloidal particles near a hard wall in concentrated suspensions. The evanescent wave averaged short-time diffusion coefficients were determined from experimental correlation functions over a range of scattering wave vectors and penetration depths. Stokesian dynamics simulations performed for similar conditions allow a direct comparison of both the short-time self-and collective diffusivity. As seen earlier [V. N. Michailidou, G. Petekidis, J. W. Swan, and J. F. Brady, Phys. Rev. Lett. 102, 068302 (2009)] while the near wall dynamics in the dilute regime slow down compared to the free bulk diffusion, the reduction is negligible at higher volume fractions due to an interplay between the particle-wall and particle-particle hydrodynamic interactions. Here, we provide a comprehensive comparison between experiments and simulations and discuss the interplay of particle-wall and particle-particle hydrodynamics in the self-and cooperative dynamics determined at different scattering wave vectors and penetration depths. (C) 2013 AIP Publishing LLC.
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