氨水添加方式对硅油基磁流体性能的影响  

Influence of Adding Ammonia Method on the Property of Silicon-Oil-Based Magnetic Fluid

作　　者：赵子粉 邵慧萍[1] 林涛[1] 郑航[1] 吴胜江 

机构地区：[1]北京科技大学新材料技术研究院,北京100083

出　　处：《稀有金属材料与工程》2016年第6期1609-1614,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51274039)

摘　　要：采用化学共沉淀法制备纳米Fe_3O_4磁颗粒,用油酸钠作表面活性剂对其进行表面改性,用硅油作为载液制备出硅油基磁流体。重点研究了氨水的不同添加顺序及氨水的不同添加速度对磁流体性能的影响,通过磁性能测试、观察磁流体静置后的沉降现象以及透射电镜对磁流体进行表征,结果表明先加氨水再加油酸钠制备的磁流体分散稳定性好,其饱和磁化强度为11.4(A·m^2)/kg,进一步研究了以10 mL/min速度滴加氨水再加油酸钠,得到的磁流体分散稳定性较好,其饱和磁化强度为14.3(A·m^2)/kg。Fe_3O_4 magnetic nanoparticles were prepared by a coprecipitation method with sodium oleate as surfactant modification, and magnetic fluid was prepared with silicon oil as the carrier. The influence of different adding ammonia orders and different adding speeds on the property of magnetic fluid was studied. The Fe_3O_4 magnetic fluid was tested by VSM, the settlement after standing and TEM. The results show that when the ammonia is added before the sodium oleate, the dispersivity of the magnetic liquid is the best and the saturation magnetization is 11.4（A·m-2）/kg. Furthermore, with dripping ammonia at a speed of 10 m L/min before adding the sodium oleate, the dispersivity of the magnetic liquid is better and the saturation magnetization is 14.3（A·m-2）/kg.

关 键 词：FE3O4 氨水 磁性能 分散性 磁流体 

分 类 号：O361.3[理学—流体力学]