中文摘要：

用共沉淀法制备纳米级Fe3O4磁流体,并对其用油酸进行表面改性。采用化学交联法,在分散有磁流体的壳聚糖溶液中,加入适量的戊二醛交联剂,制得内核为磁性Fe3O4,外层包有壳聚糖的纳米级的磁性壳聚糖复合微球。考察了壳聚糖质量浓度、NaOH滴加量及搅拌速度等因素对磁性壳聚糖微球粒径、粒径分布以及形貌等对复合过程的影响,确定了制备磁性壳聚糖微球的最佳条件,并用电镜、红外光谱图、粒径分析仪等方法对磁性壳聚糖微球的形态和组成特性进行分析。最后得出平均粒径为348.5 nm,表面富含羟基、氨基和醇羟基等官能团,磁性明显、分散性良好的磁性壳聚糖微球。

英文摘要：

The Fe3O4 nanoparticles were prepared by co-precipitation and modified by oleic acid and the composite chitosan magnetic microspheres containing Fe3O4 nanoparticles were prepared using the emulsification cross-linking technique by adding proper amount of glutaraldehyde into chitosan solution.The results demonstrated that the chitosan concentration,NaOH amount and stirring speed of the suspension medium were the most effective parameters for the size,size distribution,morphology and magnetism of magnetic chitosan microspheres.The SEM,IR and DLS indicated that the diameter of the microspheres was about 348.5 nm and the microspheres were uniformly disperse.The magnetic test showed that the microspheres had good magnetic responsiveness and the functional groups on the surface.