Figure 6From: Preparation and characterization of spindle-like Fe3O4 mesoporous nanoparticles Magnetic hysteresis loops of α-Fe 2 O 3 NPs (curve 1) and Fe 3 O 4 NPs (curve 2) (a); photographs of α-Fe 2 O 3 NPs and Fe 3 O 4 NPs before and after magnetic separation with an external magnetic field (b).Back to article page