Fabrication and characterization of self-assembled core-shell Fe_3O_4@SiO_2 nanoparticles with high magnetic sensitivity from electrospun nanofibers

We fabricated the self-assembled Fe3O4@ SiO2 magnetic composite particles with high magnetic sensitivity from electrospun fibers. The morphology of the fibers was characterized by SEM. The size distribution,morphology and magnetic characteristics of the nanoparticles were determined with FE-SEM,TEM,and VSM,respectively. The results show that the composite nanoparticles have approximately spherical shapes with many magnetic cores inside them. The size distribution of the nanoparticles averaged around 45 nm. The typical saturation magnetization of the Fe3O4@ SiO2 composite particles is up to 43. 842 A·m2/ kg,with superparamagnetic properties being observed at room temperature. Since the nanoparticles have high magnetic sensitivity,they have much promise for use in a wide range of applications.