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采用共沉淀法和溶胶-凝胶法制备了磁性Fe3O4纳米粒子及核壳型Fe3O4@SiO2复合微球,利用红外光谱(FTIR)技术测定了微球表面基团,证明了SiO2确实在Fe3O4纳米粒子的表面形成了包覆层。通过正交试验设计,利用激光粒度仪测量的微球粒径为指标,考察TEOS与磁性微球的体积比、反应温度、反应时间和乙醇浓度四因素对微球粒径的影响。结果表明TEOS与磁性微球的体积比为2、反应温度为80℃、反应时间为4 h,乙醇浓度为80%是制备大粒径Fe3O4@SiO2磁性复合微球的适宜条件。
Magnetic Fe3O4 nanoparticles and core-shell Fe3O4 @ SiO2 composite microspheres were prepared by coprecipitation and sol-gel methods. The surface groups of the microspheres were determined by FTIR spectroscopy. The surface of the coating formed. Through orthogonal experimental design, the particle size of microspheres measured by laser particle sizer was taken as an index to investigate the effects of volume fraction of TEOS and magnetic microspheres, reaction temperature, reaction time and ethanol concentration on microsphere size. The results show that the volume ratio of TEOS to magnetic microspheres is 2, the reaction temperature is 80 ℃, the reaction time is 4 h, and the ethanol concentration is 80%, which is the suitable condition for preparing large size Fe3O4 @ SiO2 magnetic composite microspheres.