以环氧丙基三甲基氯化氨(ETA)为季铵化试剂,制备了壳聚糖季铵盐(QC)--N-2-羟丙基三甲基氯化铵壳聚糖,采用AgNO3电位滴定法测定了季铵化度.以柠檬酸钠为改性剂,一步法制备了水基Fe3O4磁性纳米粒子.基于静电自组装作用,采用反相微乳液法制备了QC/Fe3O4复合磁性纳米粒子.通过多种手段对所制备的复合磁性纳米粒子的结构进行了表征、对其性能进行了研究.红外光谱(FT-IR)、热重分析(TG)及X射线光电子能谱(XPS)的结果表明,QC主要包覆于Fe3O4的表面.透射电镜(TEM)、X射线衍射(XRO)结果表明,复合磁性纳米粒子磁核为Fe3O4晶体结构,平均粒径大约为50 nm～60 nm.VSM结果表明,所制备的复合磁性纳米粒子仍具有超顺磁性,比饱和磁化强度为19.4emu/g.
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