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Issue 24, 2014
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Translational and rotational near-wall diffusion of spherical colloids studied by evanescent wave scattering

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Abstract

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.

Graphical abstract: Translational and rotational near-wall diffusion of spherical colloids studied by evanescent wave scattering

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Article information


Submitted
07 Jan 2014
Accepted
09 Apr 2014
First published
14 Apr 2014

Soft Matter, 2014,10, 4312-4323
Article type
Paper

Translational and rotational near-wall diffusion of spherical colloids studied by evanescent wave scattering

M. Lisicki, B. Cichocki, S. A. Rogers, J. K. G. Dhont and P. R. Lang, Soft Matter, 2014, 10, 4312
DOI: 10.1039/C4SM00148F

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