γ-Fe_2O_3/SiO_2复合磁性纳米粒子制备与表征  

Preparation and characterization of γ-Fe_2O_3/SiO_2 magnetic nanocomposites

作　　者：陈成[1] 贺玉成[1] 杜治平[1] 袁华[1] 吴元欣[1] 

机构地区：[1]武汉工程大学化工与制药学院绿色化工过程省部共建教育部重点实验室,湖北省新型反应器与绿色化学工艺重点实验室,湖北武汉430073

出　　处：《磁性材料及器件》2014年第1期21-23,39,共4页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金重点项目(20936003);湖北省自然科学基金重点项目(2008CDA009)

摘　　要：将粒径约40nm的γ-Fe2O3纳米粒子加入到正硅酸四乙酯凝胶体系中,经水解、缩合,用溶胶-凝胶法制备得到了核壳结构的γ-Fe2O3/SiO2复合磁性纳米粒子,并通过透射电镜、X射线衍射、红外光谱、比表面测定仪、振动样品磁强计等手段对产物进行了表征。结果表明,γ-Fe2O3/SiO2粒子呈立方体形,粒径约70nm;包覆层为无定型的SiO2;复合磁性纳米粒子表现出顺磁性和良好的磁响应性(44.78 A·m2/kg),其完整包覆率为59.1%。Adding 40-nmγ-Fe2O3 nanoparticles to TEOS gelation system, and by hydrolysis and condensation of TEOS, core-shell structuralγ-Fe2O3/SiO2 magnetic nanocomposites were prepared by sol-gel process. Bothγ-Fe2O3 nanoparticles andγ-Fe2O3/SiO2 nanocomposites were characterized by transmission electron microscope（TEM）, X-ray diffraction（XRD）, Fourier transform infrared（FTIR）,BET and vibrating sample magnetometer（VSM）. The results show thatγ-Fe2O3/SiO2 nanoparticles are cubic in shape and have an average diameter of about 70nm with coated SiO2 layer of amorphous phase. The magnetic measurements indicate that magnetic nanocomposites exhibit paramagnetic behavior with saturation magnetization of 44.78 A·m2/kg , and coverage ration of 59.1%.

关 键 词：Γ-FE2O3 Γ-FE2O3 SIO2 复合纳米粒子 磁性能 

分 类 号：TB383[一般工业技术—材料科学与工程]