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Anisotropic diffusion of concentrated hard-sphere colloids near a hard wall studied by evanescent wave dynamic light scattering

Michailidou, V. N. and Swan, J. W. and Brady, J. F. and Petekidis, G. (2013) Anisotropic diffusion of concentrated hard-sphere colloids near a hard wall studied by evanescent wave dynamic light scattering. Journal of Chemical Physics, 136 (16). Art. No. 164905. ISSN 0021-9606. doi:10.1063/1.4825261. https://resolver.caltech.edu/CaltechAUTHORS:20131213-102410397

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://scitation.aip.org/content/aip/journal/jcp/139/16/10.1063/1.4825261PublisherArticle
http://dx.doi.org/10.1063/1.4825261DOIArticle
ORCID:
AuthorORCID
Brady, J. F.0000-0001-5817-9128
Additional Information:© 2013 American Institute of Physics. Received 8 August 2013; accepted 2 October 2013; published online 28 October 2013. We acknowledge funding from GSRT (THALES project, “Covisco”), European Union (EU) (Soft Matter Infrastructure project “ESMI”), and National Science Foundation (NSF) NIRT grant (CBET 0506701). We thank Andy Schofield for providing the colloids. We also thank Jan Dhont and Peter Lang for the hospitality provided to V.M. and the access to EWDLS2 setup (ICS-1, Forschungszentrum Juelich) during spring of 2009, as well as for many helpful discussions.
Funders:
Funding AgencyGrant Number
GSRT THALES projectCovisco
European Union (EU) projectESMI
NSF NIRT grantCBET 0506701
Issue or Number:16
DOI:10.1063/1.4825261
Record Number:CaltechAUTHORS:20131213-102410397
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20131213-102410397
Official Citation:Anisotropic diffusion of concentrated hard-sphere colloids near a hard wall studied by evanescent wave dynamic light scattering V. N. Michailidou, J. W. Swan, J. F. Brady and G. Petekidis J. Chem. Phys. 139, 164905 (2013); http://dx.doi.org/10.1063/1.4825261
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42996
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:13 Dec 2013 19:32
Last Modified:10 Nov 2021 16:31

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