@article{Pearson2018-11-01Sedim-44058,
  year={2018},
  doi={10.1021/acs.jpclett.8b02703},
  title={Sedimentation of C<sub>60</sub> and C<sub>70</sub> : Testing the Limits of Stokes' Law},
  number={21},
  volume={9},
  journal={The Journal of Physical Chemistry Letters},
  pages={6345--6349},
  author={Pearson, Joseph and Nguyen, Tich Lam and Cölfen, Helmut and Mulvaney, Paul}
}

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    <dc:contributor>Nguyen, Tich Lam</dc:contributor>
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    <dc:contributor>Cölfen, Helmut</dc:contributor>
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    <dcterms:abstract xml:lang="eng">Virtually all dynamic methods for determining particle size on the nanoscale use the Stokes–Einstein–Sutherland (SES) equation to convert the diffusion coefficient into a hydrodynamic radius. The validity of this equation on the nanoscale has not been rigorously validated by experiment. Here we measure the sedimentation rates and diffusion coefficients of C&lt;sub&gt;60&lt;/sub&gt; and C&lt;sub&gt;70&lt;/sub&gt; in toluene using analytical ultracentrifugation and compare the results to the SES equation. We find that the SES equation for the drag force (nonslip boundary condition) works down to 1 nm length scales.</dcterms:abstract>
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