Abstract
Magnetic core/shell (CS) nanocomposites (MNCs) are synthesized using a simple method, in which a magnesium ferrite nanoparticle (MgFe2O4) is a core, and an amorphous silicon dioxide (silica SiO2) layer is a shell. The composition, morphology, and structure of synthesized particles are studied using X-ray diffraction, field emission electron microscopy, transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS), scattering electrophoretic photometer, thermogravimetric analysis (TGA), and Mössbauer spectroscopy. It is found that the MgFe2O4/SiO2 MNC has the core/shell structure formed by the Fe‒O–Si chemical bond. After coating with silica, the MgFe2O4/SiO2 MNC saturation magnetization significantly decreases in comparison with MgFe2O4 particles without a SiO2 shell. Spherical particles agglomerated from MgFe2O4 nanocrystallites ∼9.6 and ∼11.5 nm in size function as cores coated with SiO2 shells ∼30 and ∼50 nm thick, respectively. The total size of obtained CS MNCs is ∼200 and 300 nm, respectively. Synthesized CS MgFe2O4/SiO2 MNCs are very promising for biomedical applications, due to the biological compatibility of silicon dioxide, its sizes, and the fact that the Curie temperature is in the region required for hyperthermal therapy, 320 K.
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Original Russian Text © A.S. Kamzin, H. Das, N. Wakiya, A.A. Valiullin, 2018, published in Fizika Tverdogo Tela, 2018, Vol. 60, No. 9, pp. 1707–1716.
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Kamzin, A.S., Das, H., Wakiya, N. et al. Magnetic Core/Shell Nanocomposites MgFe2O4/SiO2 for Biomedical Application: Synthesis and Properties. Phys. Solid State 60, 1752–1761 (2018). https://doi.org/10.1134/S1063783418090147
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DOI: https://doi.org/10.1134/S1063783418090147