Synthesis and study of structural and magnetic properties of superparamagnetic Fe3O4@SiO2 core/shell nanocomposite for biomedical applications

Authors

1 Department of Physics, Ferdowsi University of Mashhad, Mashhad, Iran

2 Nanoscience Center, Ferdowsi University of Mashhad, Mashhad, Iran

3 Department of Chemistry, Ferdowsi University of Mashhad, Mashhad, Iran

10.7508/nmj.2014.02.002

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.

Keywords


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