磁流体制备中磁性颗粒的表面处理

Surface Treatment of Magnetic Particles in Preparation of Magnetic Fluids

采用油酸作为表面活性剂对磁流体制备过程中磁性粉体颗粒进行表面处理,并试图用紫外光谱分析方法对其表面改性效果进行定量评估,分析了pH值、温度和时间对磁性粉体颗粒表面修饰的影响。结果表明,紫外光谱分析法可成功地对磁性粉体颗粒表面改性效果进行定量评估,建立了磁性颗粒表面修饰效果的表征方法,确定了磁性粉体颗粒表面修饰的适宜条件,即溶液pH=6.90,温度控制在80℃,反应时间为60min。

Magnetic powder particles, which were used for the preparation of magnetic fluids, were modified with a surfactant, oleic acid. The coating on the surface of the magnetic particles was evaluated by UV, and the effects of pH, temperature and time on the surface treatment were analyzed. The results indicate that UV spectral analysis can be used to quantitatively characterize the coating on the magnetic particles. The appro-(priate) conditions for the surface treatment were identified to be pH=6.90, coating temperature of 80 ℃, and coating time of 60 min.