Fig. 3From: Fabrication of Hybrid Nanostructures Based on Fe3O4 Nanoclusters as Theranostic Agents for Magnetic Resonance Imaging and Drug Deliverya T2-weighted MRI images of the Fe3O4 NC/PAH/PSS hybrid nanostructures at different concentrations in water. b Plot of relaxation rate r2 versus Fe concentration in Fe3O4 NC/PAH/PSS hybrid nanostructures. The relaxivity value r2 was obtained from the slope of the linear fitting of the experimental dataBack to article page