液相沉积法制备磁性纳米Fe_3O_4/SiO_2复合粒子  

Preparation of Magnetic Fe_3O_4 /SiO_2 Nano-composite Particles by Chemical Deposition in Aqueous Solution

作　　者：陈令允[1] 姜炜[1] 李凤生[1] 王英会[1] 周建[1] 

机构地区：[1]南京理工大学国家特种超细粉体工程技术研究中心,江苏南京210094

出　　处：《机械工程材料》2005年第4期34-37,共4页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(50306008)江苏省自然科学基金资助项目(BK2003421)

摘　　要：采用液相沉积法在磁性Fe3O4纳米粒子的表面包覆了一层SiO2膜,制备磁性较强的纳米Fe3O4/SiO2复合粒子,采用IR、XPS、XRD、TEM、VSM等方法对复合粒子的性能进行了表征。结果表明:复合粒子的较佳制备条件为正硅酸乙酯(TEOS)的浓度为0.6mol/L,Fe3O4与TEOS物质的数量比为5:1,反应温度为50℃,搅拌速度为800r/min;在此条件下制得的复合粒子的粒径在20nm左右,比饱和磁化强度为60.5emu/g,呈球形且分散均匀。A silica film was coated onto the surface of ferriferous oxide nano-particles with the method of chemical deposition. Composite particles with uniform diameter and relatively strong magnetism were prepared by controlling reaction conditions. The properties of prepared composite particles were characterized by fourier transform infrared spectra (FTIR), X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (XRD), transmission electronic microscopy (TEM) and vibrating-sample magnetometer (VSM). It was indicated that the optimal particles had the smallest diameters of about 20 nm and relatively strong magnetism of 60. 5 emu/g under the optimal conditions of 0. 6 mol/L TEOS concentration, 5 : 1 mole ratio of Fe3O4 : TEOS, 50 ℃ reaction temperature and 800 r/min stirring rate.

关 键 词：磁性 纳米FE3O4 液相沉积 Fe3O4/SiO2复合粒子 

分 类 号：TB383[一般工业技术—材料科学与工程]