Characterization of Fe{sub 3}O{sub 4}/γ-Fe{sub 2}O{sub 3}@ SiO{sub 2} Core-Shell Structure Composite Magnetic Fluid by Microemulsion Method
- University of Science and Technology Beijing, Institute for Advanced Materials and Technology (China)
Fe{sub 3}O{sub 4}/γ-Fe{sub 2}O{sub 3}@SiO{sub 2} composite magnetic fluids were prepared successfully by microemulsion method in this study. Fe{sub 3}O{sub 4} magnetic nanoparticles (Nps) were successfully converted to Fe{sub 3}O{sub 4}/γ-Fe{sub 2}O{sub 3} magnetic Nps by low-temperature low-vacuum oxidation method (LTLV oxidation method), and then coated with silica by the modified Stöber method. The core-shell structure composite magnetic Nps were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), vibrating sample magnetometer (VSM), and transmission electron microscopy (TEM). The results show that the size of Fe{sub 3}O{sub 4}/γ-Fe{sub 2}O{sub 3} particles was about 13 nm and that of SiO{sub 2} coating was about 3 nm, and the saturation magnetization of Fe{sub 3}O{sub 4}/γ-Fe{sub 2}O{sub 3} and Fe{sub 3}O{sub 4}/γ-Fe{sub 2}O{sub 3}@SiO{sub 2} Nps was 59.12 A m{sup 2}/kg and 35.84 A m{sup 2}/kg, respectively. And the saturation magnetization of Fe{sub 3}O{sub 4}/γ-Fe{sub 2}O{sub 3}@SiO{sub 2} magnetic fluid was 22.91 A m{sup 2}/kg.
- OSTI ID:
- 22919594
- Journal Information:
- Journal of Superconductivity and Novel Magnetism, Vol. 32, Issue 2; Other Information: Copyright (c) 2019 Springer Science+Business Media, LLC, part of Springer Nature; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA); ISSN 1557-1939
- Country of Publication:
- United States
- Language:
- English
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