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. 2019 Jul 3;2019:4564709. doi: 10.1155/2019/4564709

Figure 2.

Figure 2

XRD pattern of Fe3O4 (a), Fe3O4@SiO2 (b), Fe3O4@SiO2-Co (c), and Fe3O4@SiO2-MWCNT (d).