单分子层正癸酸包覆Fe_3O_4纳米粒子的研究

Study on monolayer decanoic acid-coated Fe_3O_4 nanoparticles

应用微乳液与 Fe2 + 和 Fe3 + 化学共沉淀的方法制备了正癸酸包覆的 Fe3 O4纳米粒子水基磁流体 .用光子相关光谱仪 ( PCS)、透射电镜 ( TEM)和 JDM- 3型振动样品磁强计对制得的水基磁流体进行了表征 .制备了单分子层正癸酸包覆的 Fe3 O4纳米粒子的固态样品 ,并利用 IR,TG,DTG与DSC考查了该固态样品的组成与性质 .发现用一步表面活性剂处理可以直接制得双层表面活性剂包覆的 Fe3 O4纳米粒子水基磁流体 .

In this paper, a method is put forward for the preparation of the water-based magnetic fluids of decanoic acid-coated Fe_3O_4 nanoparticles by the chemical coprecipitation of microemulsions with Fe^(2+) and Fe^(3+) ions. The obtained water-based magnetic fluids are characterized by photon correlation spectrometer, TEM, and JDM-3 type magnetometer. The solid samples of the monolayer decanoic acid-coated Fe_3O_4 nanoparticles are prepared. The compositions and the properties of these solid samples are investigated by IR, TG, DTG and DSC. It is also found that the water-based magnetic fluids of bilayer surfactant-coated Fe_3O_4 nanoparticles can be directly prepared by using one-stage surfactant treatment.