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材料工程  2015 

MPEG修饰的纳米氧化铁粒子的合成及清洗工艺

DOI: 10.11868/j.issn.1001-4381.2015.02.008, PP. 47-52

Keywords: 氧化铁纳米粒子,超顺磁性,饱和食盐水,透析,盐桥法

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Abstract:

以MPEG为溶剂、还原剂及修饰剂,Fe(acac)3为铁源,通过高温热分解法制备了超顺磁性氧化铁纳米粒子(SPIONs).采用饱和食盐水清洗方法对合成的粒子进行收集,经透析除去其表面残留的NaCl.采用XRD,TEM,HRTEM,SQUID,ICP-MS,TGA,FT-IR,纳米粒度与Zeta电位分析仪对样品进行表征.结果表明经透析处理后氧化铁的质量分数为NaCl的6.9×104倍,制备的SPIONs具有高的结晶度及单分散性,在300K下,具有超顺磁性,饱和磁化强度为53.7A·m2·kg-1;具有惰性端基的MPEG修饰于SPIONs表面,为其提供了良好的水分散性.采用盐桥法萃取清洗工艺可清除过量的MPEG,有利于SPIONs更好的应用在生物医学领域.

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