Magnetic Core/Shell Nanocomposites MgFe{sub 2}O{sub 4}/SiO{sub 2} for Biomedical Application: Synthesis and Properties

Journal Article · Sat Sep 15 00:00:00 EDT 2018 · Physics of the Solid State

DOI:https://doi.org/10.1134/S1063783418090147· OSTI ID:22771030

Das, H. ^[1]; Wakiya, N. ^[2]; Valiullin, A. A. ^[3]

---

1. Shizuoka University, Graduate School of Science and Technology (Japan)
2. Shizuoka University, Department of Electronics and Materials Science (Japan)
3. Kazan Federal University (Russian Federation)

Magnetic core/shell (CS) nanocomposites (MNCs) are synthesized using a simple method, in which a magnesium ferrite nanoparticle (MgFe{sub 2}O{sub 4}) is a core, and an amorphous silicon dioxide (silica SiO{sub 2}) 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 MgFe{sub 2}O{sub 4}/SiO{sub 2} MNC has the core/shell structure formed by the Fe‒O–Si chemical bond. After coating with silica, the MgFe{sub 2}O{sub 4}/SiO{sub 2} MNC saturation magnetization significantly decreases in comparison with MgFe{sub 2}O{sub 4} particles without a SiO{sub 2} shell. Spherical particles agglomerated from MgFe{sub 2}O{sub 4} nanocrystallites ∼9.6 and ∼11.5 nm in size function as cores coated with SiO{sub 2} shells ∼30 and ∼50 nm thick, respectively. The total size of obtained CS MNCs is ∼200 and 300 nm, respectively. Synthesized CS MgFe{sub 2}O{sub 4}/SiO{sub 2} 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.

• OSTI ID: 22771030
• Journal Information: Physics of the Solid State, Vol. 60, Issue 9; Other Information: Copyright (c) 2018 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7834
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
COATINGS
CURIE POINT
ELECTRON EMISSION
ELECTROPHORESIS
FERRITES
FIELD EMISSION
LAYERS
MAGNESIUM COMPOUNDS
MAGNETIC CORES
MAGNETIZATION
NANOCOMPOSITES
NANOPARTICLES
PHOTOMETERS
SATURATION
SILICON OXIDES
SYNTHESIS
THERAPY
THERMAL GRAVIMETRIC ANALYSIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION