纳米Fe_3O_4颗粒及其磁流体的制备与研究  

Preparation and Study of Nano-scale Fe_3O_4 and Its Magnetic Fluids

作　　者：符晓兰[1] 卞学海[1] 赵亚萍[1] 蔡再生[1] 

机构地区：[1]东华大学生态纺织教育部重点实验室,上海201620

出　　处：《东华大学学报（自然科学版）》2011年第3期341-345,361,共6页Journal of Donghua University(Natural Science)

基　　金：教育部科学技术研究重点资助项目(109066);上海市纳米专项"高感性纳米复合功能纤维的规模化生产及其应用"资助项目(0852nm00300)

摘　　要：以氨水为沉淀剂,利用改进的化学共沉淀法制备粒径分布均匀的超顺磁性纳米Fe3O4颗粒.采用X射线粉末衍射仪(XRD)、傅里叶红外光谱仪(FT-IR)、振动样品磁强计(VSM)及透射电子显微镜(TEM)等方法对试样进行了结构与性能表征.结果表明:当n(Fe3+)/n(Fe2+)=1.75,温度为60℃,pH值为9时,超声波预处理制备的Fe3O4颗粒平均粒径在23 nm左右,饱和磁化强度(Ms)达到61.63 emu/g,具有超顺磁性.同时利用油酸钠和聚乙二醇4000(PEG 4000)的协同作用制得了稳定分散的纳米Fe3O4磁流体,当二者加入量与纳米Fe3O4颗粒质量比均为2.00∶3.48时,制备的纳米Fe3O4磁流体最稳定.With the help of ammonium hydroxide as the precipitating agent,a uniform size of super paramagnetic Fe3O4 nanoparticles were prepared by the improved chemical co-precipitation method.The morphology and magnetic properties of the samples were characterized by X-ray powder diffraction（XRD）,Fourier transform infrared spectrometer（FT-IR）,vibrating sample magnetometer（VSM） and transmission electron microscope（TEM）.When n（Fe3＋）/n（Fe2＋） =1.75,temperature 60℃,pH value=9,the results showed that the well-crystallized particles of Fe3O4 magnetic nanoparticles are obtained,with an average size of 23nm,saturation magnetization intensity（Ms）=61.63emu/g.Meanwhile,using the cooperative action between sodium oleate and polyethylene glycol 4000（PEG 4000）,when m（sodium oleate）∶m（PEG 4000）∶m（Fe3O4） =2.00∶2.00∶3.48,the obtained Fe3O4 magnetic fluids had the most stable property.

关 键 词：化学共沉淀 纳米四氧化三铁颗粒 纳米四氧化三铁磁流体 

分 类 号：TQ138.1[化学工程—无机化工]