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Characterization of Fe3O4/γ-Fe2O3@ SiO2 Core-Shell Structure Composite Magnetic Fluid by Microemulsion Method

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Abstract

Fe3O4/γ-Fe2O3@SiO2 composite magnetic fluids were prepared successfully by microemulsion method in this study. Fe3O4 magnetic nanoparticles (Nps) were successfully converted to Fe3O4/γ-Fe2O3 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 Fe3O4/γ-Fe2O3 particles was about 13 nm and that of SiO2 coating was about 3 nm, and the saturation magnetization of Fe3O4/γ-Fe2O3 and Fe3O4/γ-Fe2O3@SiO2 Nps was 59.12 A m2/kg and 35.84 A m2/kg, respectively. And the saturation magnetization of Fe3O4/γ-Fe2O3@SiO2 magnetic fluid was 22.91 A m2/kg.

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Funding

This work was financially supported by the Key Research and Development Projects of People’s Liberation Army (No. BWS17J036).

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Authors and Affiliations

  1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China

    Huiping Shao, Yuling Zhou, Jiangcong Qi, Pei Hu & Jianzhuang He

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  1. Huiping Shao
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  2. Yuling Zhou
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  3. Jiangcong Qi
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  4. Pei Hu
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Correspondence to Huiping Shao.

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Highlight

• Fe3O4/γ-Fe2O3@SiO2 core-shell structure magnetic nanoparticles and fluids were prepared successfully by microemulsion method in this study.

• Compared to Fe3O4/γ-Fe2O3, the saturation magnetization of Fe3O4/γ-Fe2O3@SiO2 nanoparticles greatly increases.

• The microemulsion method is low-cost and simple.

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Shao, H., Zhou, Y., Qi, J. et al. Characterization of Fe3O4/γ-Fe2O3@ SiO2 Core-Shell Structure Composite Magnetic Fluid by Microemulsion Method. J Supercond Nov Magn 32, 247–252 (2019). https://doi.org/10.1007/s10948-018-4910-6

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  • DOI: https://doi.org/10.1007/s10948-018-4910-6

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