Abstract
An inner asymmetric PSt/Fe3O4 composite microspheres, in which most of the inorganic parti- cles encapsulated by polymers gather into cluster in one side of the microsphere and only few particles dis- tribute 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 Magne- tometer), 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 mi- crospheres 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 con- sidered as the key factor leading to the inner asymmetric structure. Keywords inner asymmetric structure; Fe3O4; magnetic composite microspheres
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