Michailidou, V. N. and Petekidis, G. and Swan, J. W. and Brady, J. F. (2009) Dynamics of Concentrated Hard-Sphere Colloids Near a Wall. Physical Review Letters, 102 (6). 068302. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:20090828-104119071
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Abstract
We investigate the Brownian motion of hard-sphere colloids near a solid wall by Evanescent Wave Dynamic Light Scattering (EWDLS). We carried out measurements for various volume fractions of sterically stabilized poly(methyl methacrylate) (PMMA) particles over a range of scattering wave vectors, q. While in the dilute regime, the near wall short-time diffusion is significantly slowed down due to particle-wall hydrodynamic interactions (HI); as volume fraction increases, the wall effect is progressively diminished at all q's. We present a new analysis for the EWDLS short-time self- and collective diffusivities applicable to all volume fractions and a simple model for the self-diffusion describing the interplay between particle-wall and particle-particle HI. Moreover, a weaker decay of the near-wall self-diffusion coefficient with volume fraction is predicted by Stokesian dynamics simulations.
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| Additional Information: | ©2009 The American Physical Society. Received 19 July 2008; published 12 February 2009. We thank A. Schofield for providing the colloids and J. Dhont and P. Lang for discussions and a measurement in the Julich EWDLS setup (with the 154 nm sample). We acknowledge funding from GSRT (PENED-03E4566), NSF NIRT Grant No. (CBET 0506701) and EU Grants ‘‘Cosines’’ (MTCD-CT-2005-029944) and ‘‘SoftComp’’ (NMP3-CT-2004-502235). # 82.70.Dd Colloids # 47.57.-s Complex fluids and colloidal systems (fluid dynamics) # 68.35.Fx Diffusion; interface formation (solid surfaces) # 78.35.+c Brillouin and Rayleigh scattering; other light scattering (condensed matter) | ||||||||||
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| Subject Keywords: | PACS: 82.70.Dd; 47.57.-s; 68.35.Fx; 78.35.+c | ||||||||||
| Record Number: | CaltechAUTHORS:20090828-104119071 | ||||||||||
| Persistent URL: | http://resolver.caltech.edu/CaltechAUTHORS:20090828-104119071 | ||||||||||
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| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||
| ID Code: | 15403 | ||||||||||
| Collection: | CaltechAUTHORS | ||||||||||
| Deposited By: | George Porter | ||||||||||
| Deposited On: | 10 Sep 2009 16:41 | ||||||||||
| Last Modified: | 26 Dec 2012 11:16 |
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