This title appears in the Scientific Report : 2020 

Near interface diffusion of various kinds of colloidal particles
Rivera Moran, Jose Alejandro (First author)
Liu, Yi / Hsu, Chiao-Peng (Collaboration author) / Lucio, Isa / Lang, Peter R.
Biomakromolekulare Systeme und Prozesse; IBI-4
Zsigmondy Kolloquium 2020, Duesseldorf (Germany), 2020-03-09 - 2020-03-11
European infrastructure for spectroscopy, scattering and imaging of soft matteer
Functional Macromolecules and Complexes
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When suspended colloidal particles move in the ultimate vicinity of a flat solid interface, their mobility is smaller than in the bulk suspension due to a drag force caused by hydrodynamic interaction between the particle and the wall. Further, the friction acting on a particle depends on the direction of motion. Leading to different diffusion coefficients parallel, 𝑫∥,and normal, 𝑫_N, to the interface. To expand the catalogue of particles being studied at interfaces [1-5], we are now investigating colloidal particles with controlled surface roughness and hollow shells. In this work, we show the anisotropic diffusion of these particles when they are close to a glass/dispersion interface by means of evanescent wave dynamic light scattering (EWDLS). By comparing the results from rough and hollow particles with data from smooth spherical particles and with theoretical predictions for hard sphere colloids [6,7] we assess the influence of particle shape on the particle interface hydrodynamic interaction.