中國(guó)有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 20 No. 4 April 2010 |
TAN Mei-yi(譚美易), QIU Guan-zhou(邱冠周)
（School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, China）
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.
Key words: core-shell nanocomposites; iron; magnetic properties; nanoparticles
