Author/Authors :
Helmi Rashid Farimani، Mitra نويسنده Nanoscience Center, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran , , Shahtahmassebi، Nasser نويسنده Department of Physics, Ferdowsi University of Mashhad, Mashhad, Iran.Nanoscience Center, Ferdowsi University of Mashhad, Mashhad, Iran , , Roknabadi، Mahmoud Rezaee نويسنده Department of Physics, Ferdowsi University of Mashhad, Mashhad, Iran.Nanoscience Center, Ferdowsi University of Mashhad, Mashhad, Iran , , Ghows، Narges نويسنده Department of Chemistry, Ferdowsi University of Mashhad, Mashhad, Iran ,
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.
