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The characterization of the MNPs prepared via the combination of self-assembly. (a) The SEM result of the Fe3O4 MNPs; (b) The TEM result of the Fe3O4@SiO2 MNPs. The diameters of the MNPs were about 400 nm with a good dispersion, and the SiO2 shell with about 30 - 60 nm was wrapped on the MNPs surface.
