Separation of Nanoparticles in a Density Gradient: FeCo@C and Gold Nanocrystals


  • This work was supported by NIH 5 R21 CA 133492-02, MARCO-MSD, Intel, NSFC, and the Foundation for the Author of National Excellent Doctoral Dissertation of China.


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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.