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Xiaoming Sun, Scott M. Tabakman, Won-Seok Seo, Li Zhang, Guangyu Zhang, Sarah Sherlock, Lu Bai and Hongjie Dai Separation of Nanoparticles in a Density Gradient: FeCo@C and Gold Nanocrystals Angewandte Chemie International Edition 48

Article first published online: 23 DEC 2008 | DOI: 10.1002/anie.200805047

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The right sort: A post-synthesis, liquid-phase separation method sorts nanoparticles by centrifugation in a medium with a density gradient. The particles are sorted according to particle size, clustering degree, and core density ρ (see picture; d=sedimentation distance). Solid–solid interactions between colloidal particles and stable phases are thus avoided. This versatile method allows for determination of the colloid size distribution in a suspension.

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