聚乙烯吡咯烷酮水基磁流体的制备与表征

Preparation and characterization of a polyvinylpyrrolidone water-based magnetic fluid

目的制备一种稳定的水基磁流体。方法采用加入聚乙烯吡咯烷酮(PVP)作为磁性粒子包裹剂的方法制备水基磁流体。采用常用的共沉淀法制备磁性纳米粒,加入表面活性剂PVP包裹粒子,超声,减少粒子粒径,防止粒子的增大,纯化后即得水基磁流体。结果获得粒径小而分布较窄的磁性纳米粒和磁流体,在水中分散性好,磁性性能较高。结论PVP可以作为一种稳定磁流体的表面活性剂。

Objective To prepare a stable water-based magnetic fluid. Methods A water-based magnetic fluid was prepared by addition of polyvinylpyrrolidone （PVP） as the coating agent for the magnetic particles. After preparation of Fe3O4 by co-precipitation method, PVP was added for its coating, followed by ultrasonic agitation and purification. Results The magnetic nanoparticles of homogeneously small size and water-based magnetic fluid were obtained, which had good dispersion in water with strong magnetism. Conclusion PVP can be used as a surfactant to stabilize the magnetic fluid.