纳米SiO_2/Fe_3O_4磁性流体的制备及其性能表征

Preparation and Characterization of SiO_2/Fe_3O_4 Magnetic Fluid

以纳米SiO_2类流体中的SiO_2纳米粒子为"核",采用化学镀法将使用共沉淀法合成的Fe_3O_4镀覆到纳米SiO_2类流体上,得到新型的纳米SiO_2/Fe_3O_4磁性流体。采用振动磁强计(VSM)、扫描电子显微镜(SEM)和热失重(TGA)等对新型的纳米SiO_2/Fe_3O_4磁性流体进行了表征,结果表明所制备的磁性流体保持了纳米类流体在常温下液体的可流动性,粒径为230 nm,磁性流体的电导率为2.66×10^(-5)S/cm,饱和磁场强度为2.56 emu/g。在保证纳米类流体特性的情况下,成功赋予了纳米SiO_2类流体磁性功能,并且自身电性能得到了较大的提高。

Using electroless plating method to plate Fe3O4 prepared by coprecipitation synthesis on the nuclear of nanofluid, then SiO2/Fe3O4 magnetic fluid will be getted. The SiO2/ Fe3 O4 magnetic fluid is charactered by vibration magnetometer （VSM）, scanning electron microscope （SEM） and thermo-gravimetric analyzer （TGA） et al. The results show that the magnetic fluid remain fluid properties at room temperature, particle size is about 230 nm, magnetic fluid conductivity is 2.66×10-5 S/cm,and saturated magnetic field strength is 2.56 emu/g. This new SiO2/Fe3O4 magnetic fluid gives pure SiO2 nanofluid magnetic properties. Besides the improvement of its eletrical performance is obvious.