Journal Article

FZJ-2015-01987

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Translational and rotational near-wall diffusion of spherical colloids studied by evanescent wave scattering

Lisicki, M. (Corresponding Author) ; Cichocki, B. ; Rogers, S. A. ; Dhont, J. K. G.FZJ* ; Lang, P. R.FZJ*

2014
Royal Soc. of Chemistry London

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Please use a persistent id in citations: doi:10.1039/c4sm00148f

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.

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Contributing Institute(s):

1. Weiche Materie (ICS-3)

Research Program(s):

1. 451 - Soft Matter Composites (POF2-451) (POF2-451)
2. NANODIRECT - Toolbox for Directed and Controlled Self-Assembly of nano-Colloids (213948) (213948)

Appears in the scientific report 2014

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Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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