纳米Fe_3O_4粉末及其复合膜的制备与磁性能

Preparation and Magnetic Properties of Nanometer Fe_3O_4 Powder and Its Composite Coating

目前,以纳米Fe3O4制备Fe3O4/聚乙烯醇(PVA)磁性复合材料的相关报道较少。在共沉淀法中引入柠檬酸根来控制Fe3O4微晶的生长,同时分散Fe3O4使其形成胶体,成功制备了纳米Fe3O4粉末,并以PVA为载体,制备了纳米Fe3O4/PVA磁性复合膜,研究了制备的纳米Fe3O4粉末及Fe3O4/PVA复合膜的组织结构及磁性能。结果表明:纳米Fe3O4/PVA复合膜外观均匀、光滑,颗粒约0.8～1.0μm,Fe3O4与PVA间没有明显的化学键,但有一定的结合力;制备的纳米Fe3O4粉末具有超顺磁性;添加16%纳米Fe3O4制备的Fe3O4/PVA复合膜的磁响应最大,磁感应性能良好。

Nanoscale Fe3O4 powder was prepared using co-precipitation method,where citrate was introduced to control the growth and dispersion of Fe3O4 micro-crystal.As-obtained nanoscale Fe3O4 was then doped into polyvinyl alcohol(PVA) to generate nano-Fe3O4/PVA magnetic composite coating.The microstructure and magnetic properties of nanoscale Fe3O4 powder and nano-Fe3O4/PVA magnetic composite coating were analyzed.It was found that as-prepared nano-Fe3O4/PVA composite coating was uniform and smooth,with grain diameter being about 0.8~1.0 μm.Nanoscale Fe3O4 had good adhesion to PVA but was not chemically bonded with the polymer matrix.As-obtained nanoscale Fe3O4 powder possessed super paramagnetism,and the nano-Fe3O4/PVA composite coating containing 16%(mass fraction) nano-Fe3O4 had the maximum magnetic response and good magnetic induction behavior.