TY  - JOUR
AU  - Lisicki, Maciej
AU  - Cichocki, Bogdan
AU  - Rogers, Simon A.
AU  - Dhont, Jan K.G.
AU  - Lang, Peter R.
TI  - Translational and rotational near-wall diffusion of spherical colloids studied by evanescent wave scattering
JO  - Soft matter
VL  - 10
IS  - 24
SN  - 1744-6848
CY  - London
PB  - Royal Soc. of Chemistry
M1  - FZJ-2015-01987
SP  - 4312
PY  - 2014
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000337112600011
C6  - pmid:24788942
DO  - DOI:10.1039/c4sm00148f
UR  - https://juser.fz-juelich.de/record/188655
ER  -