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(a) SEM images, (b) EDX spectra, and (c) particle size distributions of the samples FS1, FS2, FS3, and FS4. The SiKa, OKa, FeKa, FeLa, FeKb, and FeKesc represent the elemental contents (Si, O, and Fe) of the magnetite/silica nanocomposites.
