Influence of surface modification of SrFe12O19 particles with oleic acid on magnetic microsphere preparation  

作　　者：Sifang Kong Peipei Zhang Xiufang Wen Pihui Pi Jiang Cheng Zhuoru Yang Jing Hai 

机构地区：[1]School of Chemical and Energy Engineering, South China University of Technology, Guangzhou 501640, China [2]South China Institute of Environmental Sciences, SEPA, Guangzhou 510655, China

出　　处：《Particuology》2008年第3期185-190,共6页颗粒学报（英文版）

基　　金：supported by Natural Science Foundation of Guangdong Province(no.04020114);Science and Technology Planning Project of Guangzhou City(2006J1-C0511).

摘　　要：Oleic acid was used as surface modification agent to improve the hydrophobicity of magnetic strontium hexaferrite particles. The structure and properties of treated magnetic particles were characterized by scanning electronic microscopy （SEM）, Fourier transform infrared spectra （FTIR）, powder X-ray diffraction （XRD） and magnetic property measurement system （MPMS）. The results show that oleic acid is chemically enwrapped on the surface of SrFe12O19 particles. Magnetic particles modified by oleic acid are highly dispersible and strongly responsive to magnetism but with slight decrease in saturated magnetization. The affinity between magnetic particles and monomers is improved by surface modification, resulting in increased particle incorporation in magnetic polymeric microspheres. The surface modification mechanism of magnetic particles by oleic acid is addressed in this work.Oleic acid was used as surface modification agent to improve the hydrophobicity of magnetic strontium hexaferrite particles. The structure and properties of treated magnetic particles were characterized by scanning electronic microscopy （SEM）, Fourier transform infrared spectra （FTIR）, powder X-ray diffraction （XRD） and magnetic property measurement system （MPMS）. The results show that oleic acid is chemically enwrapped on the surface of SrFe12O19 particles. Magnetic particles modified by oleic acid are highly dispersible and strongly responsive to magnetism but with slight decrease in saturated magnetization. The affinity between magnetic particles and monomers is improved by surface modification, resulting in increased particle incorporation in magnetic polymeric microspheres. The surface modification mechanism of magnetic particles by oleic acid is addressed in this work.

关 键 词：Oleic acid Surface modification mechanism Strontium hexaferrite DISPERSIBILITY Magnetic polymeric microsphere 

分 类 号：O6[理学—化学]