Fe^(3+)诱导囊泡相磁流体的形成及性能

Formation and Performance of Magnetic Fluids by Fe^(3+) Induced Vesicles Phase

以阳离子表面活性剂N,N-二甲基十二烷基氧化胺(DDAO)和阴离子表面活性剂硬质酸铁(STFE)为原料,通过Fe^(3+)诱导形成囊泡,并以其为微反应器,促使Fe^(2+)在囊泡内发生反应,得到平均粒径为15 nm的Fe_3O_4纳米晶,该纳米晶分散于囊泡内,得到稳定磁流体。采用广角X射线衍射(XRD),X射线光电子能谱(XPS)、透射电镜(TEM)、扫描电镜(SEM)、磁滞回线(VSM)等对合成的Fe_3O_4纳米晶以及磁流体进行分析表征。结果表明,以Fe^(3+)诱导囊泡为微反应器形成的磁流体稳定性优良,在磁场反复作用后,仍具有良好的稳定性,其中的Fe_3O_4纳米粒子颗粒均匀,具有超顺磁性特征,磁饱和度达到79.98 emu/g。

Uniform size vesicles were gotten using Fe^3＋metal coordination entrainment by utilizing a mixture of cationic N,N-dimethyl dodecyl amine oxide（ DDAO） and anionic C（54）H（105）FeO6（ STFE） as raw material. There vesicles were used as microreactor in which Fe^2＋was induced to obtain magnetic Fe3O4 nanoparticles with an average particle size of 15 nm. The nanocrystals are dispersed in vesicles to obtain stable magnetic fluid. The Fe3O4 nanoparticles and magnetic fluid are characterized and analyzed by XRay diffraction（ XRD）,X-Ray photoelectron spectroscopy（ XPS）,transmission electron microscopy（ TEM）,scanning electron microscopy（ SEM） and vibrating sample magnetometer（ VSM）. The results show that Fe3O4 nanoparticles magnetic fluid formed using Fe^3＋induced vesicle as microreactor is very stable. It still has good stability after repeated effects of magnetic field. Fe3O4 nanoparticles exhibits superparamagnetic characteristic and Ms= 79. 98 emu/g.