Binary colloidal nanoparticles with a large size ratio in analytical ultracentrifugation

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MULTIMAT: A multiscale approach towards mesostructured porous material design
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ChemPhysChem. 2019, 20(14), pp. 1799-1803. ISSN 1439-4235. eISSN 1439-7641. Available under: doi: 10.1002/cphc.201900299
Zusammenfassung

Sedimenting colloidal particles may feel surprisingly strong buoyancy in a mixture with other particles of a considerably larger size. In this paper we investigated the buoyancy of colloidal particles in a concentrated binary suspension in situ in a centrifugal field. By dispersing two different fluorescence labeled silica nanoparticles with a large size ratio (90 nm and 30 nm, size ratio = 3) in a refractive index matching solvent, we used a multi-wavelength analytical ultracentrifuge to in-situ measure the concentration gradients of both particles. The concentration of 90 nm silica nanoparticles was used to calculate the effective solvent density for the 30 nm silica nanoparticles. Then the Boltzmann equation for a sedimentation equilibrium concentration gradient with locally varying effective solvent density was used to fit the concentration gradient of 30 nm silica nanoparticles, which describes the experimental result well. This finding proves the validity of effective buoyancy in colloidal mixtures and provides a good model to study sedimenting polydisperse colloids.

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Fachgebiet (DDC)
540 Chemie
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Analytical ultracentrifugation, Binary colloidal nanoparticles, Effective buoyancy, Generalized Archimedes' principle, High concentration
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ISO 690XU, Xufeng, Helmut CÖLFEN, 2019. Binary colloidal nanoparticles with a large size ratio in analytical ultracentrifugation. In: ChemPhysChem. 2019, 20(14), pp. 1799-1803. ISSN 1439-4235. eISSN 1439-7641. Available under: doi: 10.1002/cphc.201900299
BibTex
@article{Xu2019-07-16Binar-46013,
  year={2019},
  doi={10.1002/cphc.201900299},
  title={Binary colloidal nanoparticles with a large size ratio in analytical ultracentrifugation},
  number={14},
  volume={20},
  issn={1439-4235},
  journal={ChemPhysChem},
  pages={1799--1803},
  author={Xu, Xufeng and Cölfen, Helmut}
}
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