Figure 2.

A and B: FT-IR spectra and TGA curves of 34 nm (a), 63 nm (b), 106 nm (c) and 166 nm (d) MNCs. C: Volume-averaged hydrodynamic size of MNCs. The average sizes are 53, 95, 160, 236 nm, respectively for 34, 63, 108, 166 nm clusters. D: T2 relaxation rates (1/T2) plotted against the iron concentrations for the MNCs. T2 relaxavity of the clusters are 490 (34 nm), 630 (63 nm), 420 (106 nm) and 270 s-1mM-1 (166 nm), respectively.

Li et al. Nanoscale Research Letters 2012 7:204   doi:10.1186/1556-276X-7-204
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