纳米四氧化三铁磁性微粒的表面有机改性

Surface organic modification of nanosized Fe_3O_4 magnetic particles

通过液相共沉淀法制备了纳米四氧化三铁溶胶,利用油酸对纳米粒子体进行表面改性和萃取实验,获得油酸包覆的四氧化三铁微粒。采用FT-IR和高分辨透射电镜对改性后的纳米粉体进行结构和形貌的表征。研究结果表明油酸与四氧化三铁纳米粒子间存在化学键结合。油酸对纳米四氧化三铁微粒进行改性,并且对纳米粒子进行包覆,使外表面形成保护层阻止粒子团聚,改性后的四氧化三铁微粒与有机物具有良好的相溶性,采用表面改性显著改善了纳米四氧化三铁微粒的性能指标。

The Fe3O4 nanoparticle sol is prepared by liquid -phase coprecipitation and its surface is modified by oleic acid, then the Fe3O4 nanoparticle coated with oleic acid is got. The structure and polymorphy of the particle modified are characterized by FT - IR and HRTEM. The results show that there are chemical bond between oleic acid and Fe3O4 nanoparticle. Because the Fe3O4 nanoparticles are modified and coated by oleic acid, so, the particles aggregation can be avoided, and the particles modified have good capability with organic chemicals. The performance index of nanoparticle Fe3O4 can be improved remarkably after the surface modification.