纳米Mn_(0.4)Zn_(0.6)Fe_2O_4磁流体的制备与粘度特性

Preparation and viscosity of nano-sized Mn_(0.4)Zn_(0.6)Fe_2O_4 magnetic fluid

为了得到性能稳定的磁流体,采用水热法制备Mn_(0.4)Zn0.6Fe_2O_4磁流体,使用毛细法粘度计测量磁流体的粘度,分析磁流体粘度的影响因素。结果表明:磁流体的粘度随着磁性粒子体积分数的增大而增大,且外加磁场的作用会加快增大的趋势;磁流体磁性粒子体积分数不变时,表面活性剂质量分数越大粘度也越大,当表面活性剂质量分数小于4%时,粘度增加呈线性趋势;外加磁场强度越大,粘度也越大;无论外界环境有无磁场作用,磁流体的粘度都随着温度的升高而减小,温度的升高还会减弱外加磁场对磁流体粘度的影响。

Nano-sized Mn0.4Zn0.6Fe2O4 Particles magnetic fluid was synthesized by hydrothermal method.The experimental results show that viscosity of the sample magnetic fluid increases with the increase of volume fraction of the suspended magnetic, and the effect of extra magnetic field accelerates the trend of increasing. When the volume fraction of suspended magnetic particles is invariable, the higher the concentration of the surfactants, the higher the viscosity of sample magnetic fluid, and it increases in linear tread while the concentration of surfactants is low. The stronger the extra magnetic field is, the higher the viscosity of the sample magnetic fluid is. The viscosity of the sample magnetic fluid decreases with the rise of the temperature of the magnetic fluid, no matter the magnetic field exists or not.