引用本文:
张文军, 张卉芳, 李德忠. 微乳液一步法合成Fe3O4磁流体[J]. 应用化学,
2005, 22(7): 734-738.
Citation: ZHANG Wen-Jun, ZHANG Hui-Fang, LI De-Zhong. Preparation of Fe3O4 Magnetic Fluid by One-Step Method with a Microemulsion Reactor[J]. Chinese Journal of Applied Chemistry, 2005, 22(7): 734-738.
Citation: ZHANG Wen-Jun, ZHANG Hui-Fang, LI De-Zhong. Preparation of Fe3O4 Magnetic Fluid by One-Step Method with a Microemulsion Reactor[J]. Chinese Journal of Applied Chemistry, 2005, 22(7): 734-738.
微乳液一步法合成Fe3O4磁流体
摘要:
使用Span80和石油磺酸盐复合乳化剂、异丙醇为助表面活性剂制备稳定的油包水(W/O)型微乳液,利用拟三元相图方法探索制备最佳W/O型微乳系统的条件。将此W/O型微乳系统作为"微反应器"制备Fe3O4磁性纳米粒子,并分散到载液中,一步直接合成磁流体。应用倒置荧光显微镜、透射电子显微镜和X射线衍射测试技术对Fe3O4磁流体进行表征,用古埃磁天平研究其磁性质。结果表明,微乳液一步法合成的磁流体中,磁性粒子粒径小(平均为7.4 nm),在载液中分散均匀;磁流体具有优良的稳定性和较好的磁性能。微乳液一步法使先制备磁性纳米粒子,再将其进行分散获得磁流体的工艺得以简化。
English
Preparation of Fe3O4 Magnetic Fluid by One-Step Method with a Microemulsion Reactor
Abstract:
A W/O microemulsion was prepared with Span80-PS (petroleum sulfonate) as composite emulsi-fier,isopropanol as cosurfactant and kerosene as oil phase.The optimal microemulsion conditions were found from pseudoternary phase diagrams,i.e.,the mass ratio of Span80 to PS is 4:1 and that of composite emulsifier to cosurfactant is 1:1.The Fe3O4 fluid was obtained by one-step method with the W/O micro-emulsion as microreactor to synthesize magnetic nanoparticles (reaction temperature is 30℃ and reaction time is 5 h) and kerosene as carrier liquid.The magnetic fluid was investigated by means of TEM,XRD and fluorescence microscopy.The magnetism of Fe3O4 fluid was determined by virtue of a Gouy magnetic balance.The average particle size is 7.4 nm,and magnetic particles are well-dispersed.The stable Fe3O4 magnetic fluid with good magnetism may be prepared by one-step method in the microemulsion.Accordingly,the traditional preparation method of magnetic fluid can be simplified greatly.
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Key words:
- microemulsion
- / magnetic fluid
- / pseudoternary phase diagram
- / one-step
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