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Synthesis and Study of Structural and Magnetic Properties of Superparamagnetic Fe3O4@SiO2 Core/Shell Nanocomposite for Biomedical Applications

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Author(s): Mitra Helmi Rashid Farimani | Nasser Shahtahmassebi | Mahmoud Rezaee Roknabadi | Narges Ghows

Journal: Nanomedicine Journal
ISSN 2322-3049

Volume: 1;
Issue: 2;
Start page: 71;
Date: 2013;
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Keywords: Magnetite | Silica | Core-shell structure | Superparamagnetism | Biomedical applications

ABSTRACT
  Objective(s): This paper describes coating of magnetite nanoparticles (MNPs) with amorphous silica shells.   Materials and Methods: First, magnetite (Fe3O4) NPs were synthesized by co-precipitation method and then treated with stabilizer molecule of trisodium citrate to enhance their dispersibility. Afterwards, coating with silica was carried out via a sol-gel approach in which the electrostatically stabilized MNPs were used as seeds. The samples were characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy and vibrating sample magnetometer (VSM). Results: The results of XRD analysis implied that the prepared nanocomposite consists of two compounds of crystalline magnetite and amorphous silica that formation of their core/shell structure with the shell thickness of about 5 nm was confirmed by TEM images. The magnetic studies also indicated that produced Fe3O4@SiO2 core/shell nanocomposite exhibits superparamagnetic properties at room temperature. Conclusion: These core/shell structure due to having superparamagnetic property of Fe3O4 and unique properties of SiO2, offers a high potential for many biomedical applications.
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