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In a simple ethanol-water system, the magnetic α-Fe nanoparticles (with an average diameter of 10–40 nm) were prepared by reduction of Fe 2+ 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...
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