采用化学共沉淀法,成功制备了纳米Fe3O4微粒,主要研究了Fe2+与Fe3+不同物质的量比对Fe3O4微粒、粒径及磁化强度的影响,采用不同表面活性剂制备了硅油基纳米Fe3O4磁性液体.结果表明:Fe2+与Fe2+物质的量比对Fe3O4微粒性能影响显著,对微粒尺寸影响不大,均为纳米级,当Fe2+与Fe3+物质的量比为0.6时,其饱和磁化强度达到最大,为52.1 A·m2·kg-1;在无水乙醇中,聚乙烯吡咯烷酮(PVP)的分散效果虽优于油酸,但与硅油相溶性差、增粘作用明显的缺点限制了PVP的使用;而油酸由于亲油性好,更适合作为制备硅油基Fe3O4磁性液体的表面活性剂.
Nano Fe3O4 particles were successfully prepared by chemical co-precipitation process. The effect of amount of substance ratio of Fe2+ and Fe2+ on diameter and magnetization of Fe3O4 particles was systematically studied. Different surfactants were used to prepare silicon-oil-based magnetic fluid. The results indicat that the amount of substance ratio of Fe2+ and Fe3+ had obvious effect on the properties of Fe3O4 particles, but had little effect on particle size which was all for nanometer. When the amount of substance ratio of Fe2+ and Fe2+ was 0.6, the saturation magnetization reached the maximum, 52.1 A · m2 · kg-1. Though the dispersion performance of polyvinyl pyrrolidone(PVP) was better than that of oleic acid in ethanol, bad compatibility with silicon oil and tackifying effect limited its application. Silicon-oil-based nano magnetic fluid could be prepared using oleic acid as surfactant because of excellent lipophilicity.
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