Acta Chimica Sinica ›› 2012, Vol. 70 ›› Issue (03): 345-351.DOI: 10.6023/A1105203 Previous Articles     Next Articles

Full Papers


张和鹏, 张秋禹, 张宝亮, 范新龙, 厉向杰   

  1. 西北工业大学理学院应用化学系 西安 710129
  • 投稿日期:2011-05-20 修回日期:2011-07-21 发布日期:2011-10-08
  • 通讯作者: 张秋禹
  • 基金资助:

    973 前期专项(No. 2010CB635111)资助项目和西北工业大学基础基金(No. G9KY1020)资助项目.

Preparation and Influencing Factors of Inner Asymmetric Structure Composite Microspheres

Zhang Hepeng, Zhang Qiuyu, Zhang Baoliang   

  1. Chemical Department, College of Science, Northwestern Polytechnical University, Xi'an 710129
  • Received:2011-05-20 Revised:2011-07-21 Published:2011-10-08
  • Supported by:

    Project supported by the National Basic Research Program of China (Grant No. 2010CB635111) and the Basic Research of Northwestern Polytechnical University (Grant No. G9KY1020).

An inner asymmetric PSt/Fe3O4 composite microspheres, in which most of the inorganic particles encapsulated by polymers gather into cluster in one side of the microsphere and only few particles distribute in the other part of the microsphere, were prepared in one step miniemulsion polymerization. TEM (Transmission Electron Microscopy), FTIR (Fourier Infrared Spectrum), VSM (Vibrating Sample Magnetometer), TGA (Thermogravimetry) and laser particle analyzer were used to characterize the inner structure, magnetic intensity and particle sizes of the novel microspheres. The average particle size of these new microspheres is 0.8 μm, the magnetic content of this new asymmetric composite microspheres is 46.67% and the saturation magnetization is 23.2 emu/g. The influencing factors such as the amounts of oleic acid on the surface of Fe3O4, emulsifier, co-emulsifier and hyper-dispersant are discussed in this article. And then the mechanism of this process is also investigated. Finally, the surface properties of Fe3O4 particles were considered as the key factor leading to the inner asymmetric structure.

Key words: inner asymmetric structure, Fe3O4, magnetic composite microspheres