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

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2021
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Rivera-Morán, J. Alejandro
Liu, Yi
Hsu, Chiao-Peng
Ruckdeschel, Pia
Retsch, Markus
Lisicki, Maciej
Lang, Peter R.
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Soft Matter. Royal Society of Chemistry (RSC). 2021, 17(45), pp. 10301-10311. ISSN 1744-683X. eISSN 1744-6848. Available under: doi: 10.1039/d1sm01191j
Zusammenfassung

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.

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ISO 690RIVERA-MORÁN, J. Alejandro, Yi LIU, Samuel MONTER, Chiao-Peng HSU, Pia RUCKDESCHEL, Markus RETSCH, Maciej LISICKI, Peter R. LANG, 2021. The effect of morphology and particle-wall interaction on colloidal near-wall dynamics. In: Soft Matter. Royal Society of Chemistry (RSC). 2021, 17(45), pp. 10301-10311. ISSN 1744-683X. eISSN 1744-6848. Available under: doi: 10.1039/d1sm01191j
BibTex
@article{RiveraMoran2021-10-13effec-55707,
  year={2021},
  doi={10.1039/d1sm01191j},
  title={The effect of morphology and particle-wall interaction on colloidal near-wall dynamics},
  number={45},
  volume={17},
  issn={1744-683X},
  journal={Soft Matter},
  pages={10301--10311},
  author={Rivera-Morán, J. Alejandro and Liu, Yi and Monter, Samuel and Hsu, Chiao-Peng and Ruckdeschel, Pia and Retsch, Markus and Lisicki, Maciej and Lang, Peter R.}
}
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