Figure 2

A) Diffraction pattern for sample Magh. B) Magnetization curves at 300 K for bare: ○ maghemite (Magh), and ● modified maghemite (Magh-Rh₂(H₂cit)₄). C) Infrared Spectra for ___ Magh and - - - Magh-Rh₂(H₂cit)₄; D) Zeta potential versus pH curves for □ ○ □ Magh, and □ ● □ Magh-Rh₂(H₂cit)₄.