采用多醇法制备了表面羧基化的Fe3O4超顺磁性微球,引入尿素作为均相沉淀剂,增强反应体系的碱性,加速Fe3O4磁性微球的形成;通过改变反应中添加的水量,研究水量对产物的影响并初步解释了水在反应中的作用机理,可控制备了平均粒径250～360nm的磁性微球.制备的磁性微球大小均一,表面以共价形式结合二元羧酸分子,微球中磁性物质含量超过90%(质量分数),在室温下为超顺磁性,比饱和磁化强度达74A·m2/kg,在生物磁分离、免疫分析和靶向载药等生物医学领域有广泛的应用前景.
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