疏水超顺磁性四氧化三铁纳米粒子的制备与表征

Preparation and Characterization of Hydrophobic Superparamagnetic Magnetite Nanopa rticles

在文章中,我们首先通过水相共沉淀的方法制备超顺磁性四氧化三铁(Fe3O4)纳米粒子,分别采用油酸(OA)和十八烷基三甲基硅烷(C18TMS)对Fe3O4纳米粒子进行疏水化修饰,通过透射电镜、红外光谱、接触角、紫外光谱和振动磁强计等表征手段表征疏水化修饰效果。研究发现OA和C18TMS都能对Fe3O4纳米粒子进行疏水化修饰,修饰后的Fe3O4纳米粒子粒径并没有明显的变化,而C18TMS修饰的Fe3O4纳米粒子展示更高的疏水性能和饱和磁化强度,在有机溶剂中具有更高的稳定性。

In the paper, co-precipitation method was first used to prepare Fe3O4 nanoparticles. Oleic acid（OA） and n-octadecyltrimethoxysilane（C18TMS） were used to modify Fe3O4 nanoparticles, respectively. Transmission Electron Microscope（TEM）, Fourier Transform Infrared Spectrophotometer（FT-IR）, contact angle, UV-vis and magnetometer were used to characterize magnetite particles. It is found that OA and C18 TMS modified Fe3O4 nanoparticles show high hydrophobic property. The diameter of Fe3O4 nanoparticles does not have obvious difference before and after modification. The C18 TMS modified Fe3O4 nanoparticles are more hydrophobic and higher saturation magnetization than OA modified Fe3O4 nanoparticles, and show high stability in organic solvent.