Figure 6.

Hysteresis loops (A) of Fe3O4nanocages (a) and γ-Fe2O3Nanocages (b); Photographs (B) of the Fe3O4nanocages and γ-Fe2O3nanocages (dispersed in ethanol solution) before and after magnetic separation by an external magnetic field (this magnet takes from the MSS)

Wu et al. Nanoscale Research Letters 2009 4:926-931   doi:10.1007/s11671-009-9342-6