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The effect of morphology and particle-wall interaction on colloidal near-wall dynamics

Title data

Rivera-Morán, J. Alejandro ; Liu, Yi ; Monter, Samuel ; Hsu, Chiao-Peng ; Ruckdeschel, Pia ; Retsch, Markus ; Lisicki, Maciej ; Lang, Peter R.:
The effect of morphology and particle-wall interaction on colloidal near-wall dynamics.
In: Soft Matter. (28 September 2021) .
ISSN 1744-6848
DOI: https://doi.org/10.1039/D1SM01191J

Abstract in another language

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 a smooth surface differ only slightly from the theoretical prediction for hard sphere 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 affects their diffusion.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry I > Chair Physical Chemistry I - Univ.-Prof. Dr. Markus Retsch
Profile Fields
Profile Fields > Advanced Fields > Polymer and Colloid Science
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Colloids and Interfaces - BZKG
Research Institutions > Affiliated Institutes > Bavarian Polymer Institute (BPI)
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 14 Oct 2021 06:21
Last Modified: 14 Oct 2021 06:21
URI: https://eref.uni-bayreuth.de/id/eprint/67318