. 2020 Mar 27;5(13):7406–7417. doi: 10.1021/acsomega.9b04450

Table 1. Selected Properties of Fe₃O₄, Fe₃O₄@SiO₂, and Fe₃O₄@SiO₂–EDTA–Ni(II) NPs.

sample	Fe₃O₄ crystal structure	specific surface area (m²/g)^a	magnetite particle size (nm)^b
Fe₃O₄	cubic spinel	480	11.33
Fe₃O₄@SiO₂	cubic spinel	430.3	12.64
Fe₃O₄@SiO₂–EDTA–Ni(II)	cubic spinel	371.6	14.97

Calculated by the BJH method.

Calculated by the Scherrer equation based on XRD patterns.

Table 1. Selected Properties of Fe3O4, Fe3O4@SiO2, and Fe3O4@SiO2–EDTA–Ni(II) NPs.