用化学沉淀法制备的Fe3O4微粒经表面活性剂包覆后,悬浮于水载液中得到了磁性液体,研究了水基磁性液体的制备工艺和性能.用扫描电镜对磁性颗粒在水中的分散情况进行了观测,用XRD对磁性颗粒的物相进行了分析,用振动磁场测定仪测定了磁性液体的饱和磁感应强度.结果表明:通过选用理想的表面活性剂,制备出的水基磁性液体饱和磁感应强度达到1551Gs,矫顽力和剩磁均趋于零,磁性颗粒是标准的Fe3O4纳米颗粒,粒径为13.30nm.

Magnetic fluids were prepared by chemical precipitation method with water as a based liquid.The technical process and properties of a series of prepared magnetic fluids were studied.The dispersing properties of nanosized Fe3O4 in water and magnetic particle size were analyzed by scanning electron microscopy (SEM).The composed phases of magnetic particles were identified by X-ray diffraction (XRD).The saturated magnetization intensity of the magnetic fluid was measured by vibrating sample magnetometer.The size of the magnetic particles of the aqueous magnetic fluids were between 10nm and 20nm by choosing an ideal surfactant.The saturated magnetization intensity was up to 15.51Gs.The coercivity and remanence were almost zero.