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. 2020 Apr 20;15:2583–2603. doi: 10.2147/IJN.S231062

Figure 12.

Figure 12

Frontier orbital density distributions (HOMO and LUMO) for Fe3O4, Fe3O4/SiO2/APTS, Fe3O4/SiO2/APTS~Schiff base and Fe3O4/SiO2/APTS~Schiff base-Cu(II) in aqueous phase.