Characterization of size, anisotropy, and density heterogeneity of nanoparticles by sedimentation velocity

B Demeler; TL Nguyen; GE Gorbet; V Schirf; EH Brookes; P Mulvaney; AO El-Ballouli; J Pan; OM Bakr; AK Demeler; BI Hernandez Uribe; N Bhattarai; RL Whetten

Journal article

Characterization of size, anisotropy, and density heterogeneity of nanoparticles by sedimentation velocity

B Demeler, TL Nguyen, GE Gorbet, V Schirf, EH Brookes, P Mulvaney, AO El-Ballouli, J Pan, OM Bakr, AK Demeler, BI Hernandez Uribe, N Bhattarai, RL Whetten

Analytical Chemistry | Published : 2014

DOI: 10.1021/ac501722r

Abstract

A critical problem in materials science is the accurate characterization of the size dependent properties of colloidal inorganic nanocrystals. Due to the intrinsic polydispersity present during synthesis, dispersions of such materials exhibit simultaneous heterogeneity in density ρ, molar mass M, and particle diameter d. The density increments ∂ρ/∂d and ∂ρ/∂M of these nanoparticles, if known, can then provide important information about crystal growth and particle size distributions. For most classes of nanocrystals, a mixture of surfactants is added during synthesis to control their shape, size, and optical properties. However, it remains a challenge to accurately determine the amount of pa..

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University of Melbourne Researchers

Paul Mulvaney Author

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Grants

Awarded by National Institute of General Medical Sciences

Funding Acknowledgements

B.D. acknowledges support from the National Science Foundation (Grants ACI-1339649, OCI-1032742, and MCB-070039). O.M.B., A.O.E., and J.P. acknowledge the financial support of KAUST's University Research Fund. P.M. acknowledges support through ARC Grant DP130102134. E.H.B. acknowledges support through NIH/K25GM090154 and NSF/CHE-1265821. B.I.H.U. thanks the trustees of the Max and Minnie Tomerlin Voelcker Fund for financial support through the Voelcker Biomedical Research Academy scholar program. N.B. and R.L.W. acknowledge funding from NSF-PREM DMR-0934218. T.-L.N. thanks Prof. Helmut Colfen from University of Konstanz for the use of the multi-wavelength detected AUC and Mr. Johannes Walter from the Institute of Particle Technology at the University of Erlangen, Germany, for his assistance and the development of the data acquisition software for the multi-wavelength detector used in these experiments.