Novel synthesis of mesoporous silica/Fe3O4 nanocomposite with core-shell structure

In this study, magnetic core–shell structure Silica/Fe3O4 nanoparticle swere synthesized with vesicles as soft templates. In the preparation, FeCl2 and tetraethyl ortho silicate (TEOS) were selected as Fe processor and Si precursor, respectively. Stable vesicles first formed in 0.03 mol.L−1 1:2 mixture of anionic surfactant sodium dodecyl sulfate and cationic surfactant cetyltrimethyl ammonium bromide. Then, TEOS was added in the vesicle aqueous solution, leading to a highly dispersed solution. After high-temperature calcination, Silica/Fe3O4 nanoparticles were obtained. Their structure and morphology were characterized by Saturn Digisizer, transmission electron microscope and vibrating sample magneto-meter. The results indicate that the vesicles are spherical and their size could be tuned between 20 and 50 nm. The average grain diameter of synthesize magnetic particles is 100–150 nm and most of them are in elliptical shape. The dispersion of magnetic particles is very good and magnetization values are up to 33.44 emu·g−1, which are superior to that of other Fe3O4 materials reported.

کلیدواژه ها:

Novel ، Mesoporous ، Silica ، Core-Shell ، Nanocomposite.