Determination of nanoparticle size distribution together with density or molecular weight by 2D analytical ultracentrifugation
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Carney_2011-Determination of nanoparticle.pdf
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Author(s)
Carney, Randy P.
Kim, Jin Young
Qian, Huifeng
Jin, Rongchao
Mehenni, Hakim
Stellacci, Francesco
Bakr, Osman M.
Date Issued
June 2011
Journal
Nature Communications
Publisher
Nature Publishing Group
Citation
Carney, Randy P., Jin Young Kim, Huifeng Qian, Rongchao Jin, Hakim Mehenni, Francesco Stellacci, and Osman M. Bakr. “Determination of nanoparticle size distribution together with density or molecular weight by 2D analytical ultracentrifugation.” Nature Communications 2 (June 7, 2011): 335. © 2011 Nature Publishing Group, a division of Macmillan Publishers Limited
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Final published version
Abstract
Nanoparticles are finding many research and industrial applications, yet their characterization remains a challenge. Their cores are often polydisperse and coated by a stabilizing shell that varies in size and composition. No single technique can characterize both the size distribution and the nature of the shell. Advances in analytical ultracentrifugation allow for the extraction of the sedimentation (s) and diffusion coefficients (D). Here we report an approach to transform the s and D distributions of nanoparticles in solution into precise molecular weight (M), density (ρ[subscript P]) and particle diameter (d[subscript p]) distributions. M for mixtures of discrete nanocrystals is found within 4% of the known quantities. The accuracy and the density information we achieve on nanoparticles are unparalleled. A single experimental run is sufficient for full nanoparticle characterization, without the need for standards or other auxiliary measurements. We believe that our method is of general applicability and we discuss its limitations.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1038/ncomms1338
