Fe_3O_4/PSt/TiO_2多层包覆电磁响应微球的制备  

Preparation of Fe_3O_4/PSt/TiO_2 composite particles with electrical and magnetic response

作　　者：郭红霞[1] 赵晓鹏[1] 

机构地区：[1]西北工业大学电流变技术研究所,陕西西安710072

出　　处：《功能材料》2003年第1期34-36,共3页Journal of Functional Materials

基　　金：国家自然科学基金重点资助项目(59832090);国家杰出青年科学基金资助项目(50025207);西北工业大学博士创新基金资助项目(200129)

摘　　要：　首先采用分散聚合法将自制的Fe3O4磁流体和苯乙烯反应合成有磁核的Fe3O4/PSt磁性聚合物微球,然后,用非均匀成核水解反应在Fe3O4/PSt微球外包覆无定形二氧化钛,获得Fe3O4/PSt/TiO2复合微粒。用红外光谱、扫描电镜和热分析对粒子的形貌和结构进行了表征。并测试了微粒的介电性能和磁性,结果表明,所制得复合微粒有良好的电、磁响应性。The composite particles responsive to electric and magnetic field are synthesized in this note, which consist of magnetic preparation of Fe3O4/PSt polymer particles as core and the amorphous titanate as coated shell. The morphology and the dimension of the particles by scanning electron microscope showed that the composite particles were as-spherical with average diameter of 3.60 μm, nearly two times larger than that of the core particle of 1.923 μm in diameter. The FT-IR spectra and TG-DTA curves of the particles determined the structure of the coated composite particles. The measured results of the composite particles, such as dielectric constant, conductivity were approximate to that of the amorphous titanate particles. Meanwhile, the transmittance of the composite particles aqueous suspension under magnetic field can reach 90% within 900 s, contrast to that of 60% under natural settlement. Furthermore, the suspended particles in silicon oil were aligned under either electric or magnetic field. It was concluded that the as-formed composite particles were responsive to the electric and magnetic field.

关 键 词：Fe3O4/PSt/TiO2 多层包覆 电磁响应 微球 制备 

分 类 号：TB381[一般工业技术—材料科学与工程]