纳米Fe_3O_4磁性粒子合成过程中分散体系的影响

Effect of Dispersion on Preparation of Nano-Fe_3O_4 Particles

分别采用水体系化学共沉淀法和聚乙二醇体系化学共沉淀法制备了超顺磁性的纳米Fe3O4 磁性粒子,并比较了它们在物相组成、磁性能以及分散稳定性等方面的差异.结果显示:在2种体系中制备的纳米Fe3O4 磁性粒子都呈现出较好的超顺磁性,其中水体系中制备的纳米 Fe3O4 磁性粒子结晶度较高,聚乙二醇体系中制备的纳米 Fe3O4 磁性粒子磁化率和分散稳定性较优.

Precipitation in H2O system and in PEG system was used to prepare the nano-Fe3O4 particles which exhibit super-paramagnetic behavior. Further more, they were compared with each other in phase, magnetic characteristics and stability. The results show that the nano-Fe3O4 particles prepared in two systems exhibit super-paramagnetic behavior. Compared with each other, the particles prepared in H2O system show better crystallinity, while the particles prepared in PEG system show higher magnetic susceptibility and better stability.