Magnetite Nanoparticles Surface Coating SiO2 and Magnetic Properties Evaluation
Magnetite nanoparticles were obtained by liquid phase precipitation method in which the pH value of [FeCl2⋅4H2O], [FeCl3⋅6H2O] and [NaOH] solution were controlled. Then the magnetite nanoparticle were scattered in water solution and put in [Na2SiO3] and [HCl], the resultant of reaction SiO2 can be coated on magnetite nanoparticles surface. The morphology and magnetite properties of the coated nanoparticles were evaluated by XRD, TEM, FTIR and VSM. The SiO2 thin film with nanometer size was coated on surface of nanoparticle, so that the magnetic value is decreased with the coating thickness increasing.
Wei Pan and Jianghong Gong
D. Y. Ju et al., "Magnetite Nanoparticles Surface Coating SiO2 and Magnetic Properties Evaluation", Key Engineering Materials, Vols. 368-372, pp. 1366-1369, 2008