Talk (non-conference) (Invited)

FZJ-2021-04608

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png On the effects of morphology and particle wall interaction on near wall dynamics

Lang, P. R. (Corresponding author)FZJ* ; Liu, Y.FZJ* ; Rivera Moran, J. A.FZJ*

2021

Abstract: We investigated the near-wall Brownian dynamics of different types of colloidal particles with a typical size in the 100 nm range using evanescent wave dynamic light scattering (EWDLS). In detail we studied dilute suspensions of silica spheres and shells with a smooth surface and silica particles with controlled surface roughness. While the near wall dynamics of the particle with smooth surface differ only slightly from the theoretical prediction for hard spheres colloids, the rough particles diffuse significantly slower. We analysed the experimental data by comparison with model calculations and suggest that the deviating dynamics of the rough particles are not due to increased hydrodynamic interaction with the wall. Rather, the particle roughness significantly changes their DLVO interaction with the wall, which in turn effects their diffusion.

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Contributing Institute(s):

1. Biomakromolekulare Systeme und Prozesse (IBI-4)

Research Program(s):

1. 5244 - Information Processing in Neuronal Networks (POF4-524) (POF4-524)
2. EUSMI - European infrastructure for spectroscopy, scattering and imaging of soft matter (731019) (731019)

Appears in the scientific report 2021

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