Figure 6.

Magnetic hysteresis loops of α-Fe2O3 NPs (curve 1) and Fe3O4 NPs (curve 2) (a); photographs of α-Fe2O3 NPs and Fe3O4 NPs before and after magnetic separation with an external magnetic field (b).

Zhang et al. Nanoscale Research Letters 2011 6:89   doi:10.1186/1556-276X-6-89
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