Figure 5.
Magnetization curves of Fe3O4@SiO2 and Fe3O4@SiO2/PEI measured at room temperature.
Notes: Inset: magnetic targeting under an external magnet, (A) Fe3O4@SiO2 and (B) Fe3O4@SiO2/PEI.
Abbreviation: PEI, polyethylenimine.
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