用热解(pyrogenation)-退火(anneal)法制备了碳包覆坡莫合金纳米粒子(carbon encapsulated permalloynanoparticles,CEPNPs),选用油酸为表面活性剂,煤油为载液,采用机械球磨法制备出CEPNPs磁流体.用XRD,粒度分析仪和HRTEM分析了CEPNPs的物相组成、粒度分布和微观形貌;用磁天平法测定了CEPNPs磁流体的磁性能;用旋转粘度仪探讨了其流变学性能.结果表明:制备的CEPNPs具有壳/内核包覆结构,平均粒径在75nm左右;以其制备的磁流体外观呈黑色粘稠状,稳定性好,在无磁场条件下磁流体粘度随转子转速的增大而减小,有外磁场时,磁流体粘度随磁场强度增大而增大.
Carbon encapsulated permalloy nanoparticles(CEPNPs) were prepared with a pyrogenation-anneal meth-od. Nanometer magnetic fluid was obtained by mechanical ball milling, using oleic acid as the modifier and kerosene as the carrier liquid. The phase, particle sizes and microstrueture of CEPNPs were investigated with XRD, particle size analyzer and HRTEM respectively, The magnetic properties of magnetic fluid were studied with magnetic scale,And the rheological properties of magnetic fluid were studied with rotational viscometer. The results indicate thatCEPNPs are core-shell nanostructure, the particles size is 75 nm on an average, CEPNPs magnetic fluid looks black and viscous and stable, and the viscosity of CEPNPs magnetic fluid decreases with increasing shear rate without magnetic field and increases with the applied magnetic field .
参考文献
| [1] | 李德才.磁性液体理论及应用[M].北京:科学出版社,2003:81. |
| [2] | 张立德;牟季美.纳米材料和纳米结构[M].北京:科学出版社,2002 |
| [3] | 王晨,胡军,罗伟,严密.磁性液体的研究进展[J].金属功能材料,2003(04):35-38. |
| [4] | 赵朝辉,姚素薇,张卫国.纳米Fe3O4磁性颗粒的制备及应用现状[J].化工进展,2005(08):865-868. |
| [5] | 刘思林,滕荣厚,于英仪.磁性液体的制备及应用[J].粉末冶金工业,2000(05):32-39. |
| [6] | I. Bolshakova;M. Bolshakov;A. Zaichenko .The investigation of the magnetic fluid stability using the devices with magnetic field microsensors[J].Journal of Magnetism and Magnetic Materials,2005(0):108-110. |
| [7] | Sutariya G M;Upadhyay R V et al.Preparation and properties of stable magnetic fluid using Mn substituted ferrite particles[J].Journal of Colloid and Interface Science,1993,155:152-155. |
| [8] | Wooding A;Kilner M et al.Studies of the double surfactantlayer stabilization of water based magnetic fluid[J].Journal of Colloid and Interface Science,1991,144(01):236-242. |
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