Preparation and characterization of Fe/SiO_2 core/shell nanocomposites |
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| Authors: | YUAN Ming-liang TAO Jia-hua YAN Guan-jie TAN Mei-yi QIU Guan-zhou School of Mineral Processing Bioengineering Central South University Changsha China |
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| Affiliation: | YUAN Ming-liang,TAO Jia-hua,YAN Guan-jie,TAN Mei-yi,QIU Guan-zhou School of Mineral Processing , Bioengineering,Central South University,Changsha 410083,China |
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| Abstract: | In a simple ethanol-water system, the magnetic α-Fe nanoparticles (with an average diameter of 10-40 nm) were prepared by reduction of Fe2+ using potassium borohydride in the presence of surfactant. Then the shell was formed by hydrolysis- condensation polymerization of tetraethylorthosilicate (TEOS) on the surface of the Fe particles. The samples were characterized by XRD, TEM, SAED, TG-DSC and VSM. The results indicate that a thin film of silica is coated on the surface of Fe particles through a Si-O-Fe bond. The coated shell of silica can effectively protect the Fe cores from being oxidized. |
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| Keywords: | core-shell nanocomposites iron magnetic properties nanoparticles |
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