【作者】 甄良； 张旭茗； 徐成彦； 杨丽； 张梦炎；

【Author】 ZHEN Liang,ZHANG Xu-ming,XU Cheng-yan,YANG Li, ZHANG Meng-yan (School of Materials Science and Technology, Harbin Institute of Technology, Harbin 150001, China)

【机构】 哈尔滨工业大学材料科学与工程学院；

【摘要】 通过化学共沉淀法制备了Fe3O4铁氧体磁性纳米颗粒,系统研究了反应物的pH值、Fe3+与Fe2+配比及阳离子浓度等工艺参数对颗粒物相、粒度及磁性能的影响。结果表明,在合适的工艺参数下,通过该方法可以获得粒度分布均匀、直径为12nm左右的Fe3O4纳米颗粒。制备了水基Fe3O4铁氧体磁流体,研究了载液 pH值、表面活性剂包覆等对磁流体分散性及稳定性的影响以及纳米颗粒与表面活性剂之间的结合。研究表明,在本文给定的工艺条件下可制备分散良好且稳定的水基油酸钠包覆Fe3O4铁氧体磁流体。更多还原

【Abstract】 Fe3O4 nanoparticles were successfully prepared via chemical co-precipitation method. The effect of pH value, Fe3+/Fe2+ mole ratio and cation concentration on the phase structure, size and magnetic properties of the synthesized Fe3O4 nanoparticles was systematically studied. It was shown that uniform Fe3O4 nanoparticles with average diameter of c. a. 12nm could be synthesized with controlled experimental parameters. The influence of pH value and surface surfactant coating on the dispersibility and stability of water-based Fe3O4 magnetic fluid was also studied. Water-based magnetic fluid of Fe3O4 nanoparticles coated with sodium oleate by chemical bonding can be successfully prepared with high stability.更多还原