Journal
SOFT MATTER
Volume 10, Issue 24, Pages 4312-4323Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4sm00148f
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Funding
- National Center of Science [2012/07/N/ST3/03120]
- Foundation for Polish Science International PhD Projects Programme
- EU European Regional Development Fund
- EU [NMP4-SL-2008-213948]
- European Commission [262348]
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In this article we extend recent experimental developments [Rogers et al., Phys. Rev. Lett., 2012, 109, 098305] by providing a suitable theoretical framework for the derivation of exact expressions for the first cumulant (initial decay rate) of the correlation function measured in Evanescent Wave Dynamic Light Scattering (EWDLS) experiments. We focus on a dilute suspension of optically anisotropic spherical Brownian particles diffusing near a planar hard wall. In such a system, translational and rotational diffusion are hindered by hydrodynamic interactions with the boundary which reflects the flow incident upon it, affecting the motion of colloids. The validity of the approximation by the first cumulant for moderate times is assessed by juxtaposition to Brownian dynamics simulations, and compared with experimental results. The presented method for the analysis of experimental data allows the determination of penetration-depth-averaged rotational diffusion coefficients of spherical colloids at low density.
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