摘要
从理论上解析了磁性颗粒之间的相互作用对纳米磁性液体稳定性的影响 ,指出磁粒半径和浓度 ,表面活性剂的包覆是影响磁液稳定性的重要因素 .采用湿化学共沉淀法制备了纳米Fe3O4 磁性液体 ,经过TEM等手段的表征 ,证明平均粒径为 10nm ,稳定性良好 .实验研究了加料方式、搅拌速度、分散作用、表面活性剂包覆时机、包覆时间和加入量以及pH值诸多工艺因素对磁液稳定性的影响 。
The effect of interaction (attraction effect and r ep ulsion effect) between magnetic particles on the stability of nanometer magnetic fluids was analyzed theoretically. It was pointed that the size and concentrati on of magnetic particles and the coating of surfactant were important factors af fecting the stability of magnetic fluids. Nanosized Fe 3O 4 magnetic fluids we re prepared by the chemical co-precipitation method. Characterized by means of TEM, zeta potential and so on, the magnetic fluids had the mean size of 10 nm an d exellent stability. The stability of magnetic fluids was researched experiment ally as to the factors such as the method of adding starting materials, the spee d of stirring, dispersion effect, surfactants coating occasion, coating time and adding amount, and pH. The affecting mechanism of these factors was analyzed fu rther.
基金
ProjectsupportedbytheNationalNaturalScienceFoundationofChina (50 2 42 0 0 8)
