晶种和磁场诱导联合法制备一维Fe_3O_4粒子

Seed-Mediated Synthesis of One-Dimensional Fe_3O_4 Particles under Magnetic Field

本文采用晶种和磁场诱导结合的方法制备出了一维Fe3O4纳米粒子,研究了晶种粒径大小、磁场强度、晶种添加量以及晶种分步次数对Fe3O4产品形貌的影响。结果表明,磁场强度增加,棒形颗粒数目增加;晶种分步次数增加,棒形粒子轴比增加;采用三次晶种可以得到轴比为9.0的棒形颗粒;少量的晶种有利于得到轴比一致、形貌均匀的棒形颗粒;大尺寸的晶种有利于得到链形颗粒。同时从颗粒间的相互作用能分析了磁场强度和晶种大小对形貌的影响。

One-dimensional Fe3O4 particles were prepared by combination of seed-mediated growth and magnetic field induction.The effects of seed size,magnetic field intensity,seed volume and the steps of seed addition on the shape of samples were discussed.The results show that the number of rod-like Fe3O4 particles increases with magnetic field increasing and the aspect-ratio of particles increases with an increase of steps of seed addition.A three-step seeding method leads to preparation of particles with an aspect ratio of 9.0.A small amount of seeds are favorable to rod formation with uniform shape and aspect-ratio while large size seeds tend to obtain chain-like particles.The effects of magnetic field and the size of seeds on particle shape were analyzed based on the forces between neighboring particles.