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. Author manuscript; available in PMC: 2011 Dec 22.
Published in final edited form as: J Am Chem Soc. 2010 Nov 30;132(50):17724–17732. doi: 10.1021/ja102138a

Figure 3.

Figure 3

Size selection of Fe3O4 NPCs by differential centrifuge. (A, B), low and high magnification TEM images of NPCs made from 3 nm NPs, showing that NPCs larger than 50 nm can be collected in the first centrifuge run at 10,000 rpm for 5 min; (C, D), low and high magnification TEM images of NPCs showing that smaller ones will be spun down in the second round centrifuge at 15,000 rpm for 20 min.