Abstract
This article reports a novel type of composite microspheres showing magnetic properties. The composite microspheres consist of Fe 3O 4, silica, and poly(γ-benzyl- l-glutamate) (PBLG). For preparing such composite microspheres, Fe 3O 4 nanoparticles were fabricated by the solvothermal method and then coated with a silica shell by tetraethoxysilane. Subsequently, amino groups were introduced on the above Fe 3O 4-silica spheres by using 3-aminopropyltriethoxysilane. Finally, the obtained spheres were used as initiator for polymerizing γ-benzyl- l-glutamate N-carboxyanhydride (BLG-NCA), providing the anticipated magnetic composite microspheres. Such microspheres were characterized by FT-IR, TEM, large-angle powder XRD, and vibrating sample magnetometer. FT-IR spectra demonstrated that the PBLG chains adopted α-helical conformations. The magnetic composite microspheres showed a high saturation magnetization of 34.1 emu/g and the expected rapid magnetic responsivity.
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