采用化学共沉淀法制备纳米Fe3O4,油酸包覆,高锰酸钾氧化,修饰得到羧基功能化的亲水性磁性纳米复合粒子.通过XRD、TEM、傅里叶红外光谱仪等方法对纳米复合粒子的形态、结构及磁性能进行了研究.结果显示:修饰前后的纳米粒子粒径基本无变化,粒径20 nm左右.纳米复合粒子的磁性能表现出超顺磁性,矫顽力减小为0,羧基化磁性纳米粒子可在pH=7.4的磷酸缓冲液中形成稳定分散的磁流体.
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