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采用化学共沉淀法制备Fe3O4纳米粒子,利用一系列化学反应对Fe3O4表面进行修饰,通过化学键将双官能偶氮引发剂2,2’-偶氮[2-甲基-N-(2-羟乙基)]丙酰胺(AMNHP)接入Fe3O4表面。然后采用表面引发自由基聚合法,以甲基丙烯酸(MAA)和丙烯酰胺(AAm)为聚合单体制备了P(MAA-co-AAm)/Fe3O4交联磁性复合微球,并对其进行了表征。透射电镜(TEM)照片显示,磁性复合微球呈现明显的核-壳结构特征,分散性较好。磁强计(VSM)分析证明,P(MAA-co-AAm)/Fe3O4交联磁性微球具有超顺磁性。
Fe3O4nanoparticles were prepared by chemical coprecipitation and the surface of Fe3O4 was modified by a series of chemical reactions. The bifunctional azo initiator 2,2’-azo [2-methyl-N- (2-hydroxyethyl) )] Propanamide (AMNHP) into the Fe3O4 surface. Then, P (MAA-co-AAm) / Fe3O4 cross-linked magnetic composite microspheres were prepared by surface-initiated radical polymerization using methacrylic acid (MAA) and acrylamide (AAm) Characterization. Transmission electron microscopy (TEM) photographs showed that the magnetic composite microspheres showed obvious core-shell structure characteristics, better dispersion. Magnetometer (VSM) analysis proves that P (MAA-co-AAm) / Fe3O4 cross-linked magnetic microspheres have superparamagnetism.