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6632851 
Journal Article 
Surface organic modification of magnetic iron oxide black particles 
Shi, WX; Yang, J; Wang, TJ; Jin, Y; , 
2001 
Yes 
Acta Physico - Chimica Sinica
ISSN: 1000-6818 
PEKING UNIV PRESS 
BEIJING 
17 
6 
507-510 
Chinese 
WOS:000169596200007 
The affinity between magnetic particles (Fe3O4) and monomer or its polymer is a key factor affecting the function of micro-spheres in the preparation of encapsulated magnetic micro-spheres(EMMS), Silane coupling[KH-570, CH2C(CH3)C(O)OC3H6Si (OCH3)(3)] was used for the surface modification of fine magnetic particles with 0.2 similar to 0.3 mum in size and tetrahedron in crystal form. Ethanol/water solution was used as modification medium for silane coupling. Fourier transform infrared spectrometer and X-ray photoelectron spectra analysis show that the coupling bonds chemically on the particle surface, leading to the affinity improvement between magnetic particles and monomer or its polymer. The encapsulated magnetic microspheres synthesized by dispersion polymerization of styrene in the presence of modified Fe3O4 particles are significantly improved compared with that when unmodified Fe3O4 particles are used.