A novel approach to fabrication of superparamagnetite hollow silica/magnetic composite spheres |
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| Authors: | Junjie Yuan Xiong Zhang |
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| Institution: | a School of Materials Science and Engineering, Tongji University, Shanghai 200092, PR China
b Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai 200433, PR China |
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| Abstract: | We described a method for synthesizing hollow silica/magnetic composite spheres using sulfonic acid functionalized hollow silica spheres (SAFHSS) as templates. The Fe3O4 nanoparticles were deposited on or imbedded in the hollow silica shell by a precipitation reaction. The morphologies, composition and properties of the hollow composite spheres were characterized by transmission electron microscopy, Fourier transform infrared analysis, X-ray diffraction measurement and vibrating-sample magnetometry measurement. The results indicated crystal sizes and amount of the Fe3O4 nanoparticles on the SAFHSS. The magnetic properties of the hollow composite spheres were controlled by adjusting the proportion between Fe2+ and Fe3+ and iron ion total concentration. When appropriate loading species were added into the system, superparamagnetite hollow composite spheres were obtained. The method also could be applicable to prepare other superparamagnetite hollow silica/ferrite composite spheres. |
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| Keywords: | Hollow silica sphere Supermagnetism Sulfonation Composite |
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