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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 5.

Figure 5

Comparison between NPCs and individually dispersed iron oxide NPs of their response to an external magnetic field. (A) TEM images of individually dispersed 6 nm iron oxide NPs, identical to those used to form clusters after being transferred from oil to water; (B) Photos show that no visible movement of individual NPs was observed in 12 h, indicating a very weak magnetic moment of individual NPs; (C) Photos show that all the NPCs were attracted to the magnet in just a few minutes, indicating a strong magnetic moment resulting from the collective effect of nanoparticles in NPCs.