Acta Chimica Sinica ›› 2011, Vol. 69 ›› Issue (12): 1381-1386.     Next Articles

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相转移方法制备水溶性Fe3O4纳米晶

周长华1,李晓民1,司红磊1,郭轶2,徐力2,张治军1,李林松*,1   

  1. (1河南大学教育部特种功能材料重点实验室 开封 475004)
    (2吉林大学分子酶与工程教育部重点实验室 长春 130021)
  • 投稿日期:2010-12-07 修回日期:2011-01-22 发布日期:2011-02-11
  • 通讯作者: 周长华 E-mail:changhua@henu.edu.cn
  • 基金资助:

    近红外纳米晶的合成及应用

Synthesis of Water-soluble Fe3O4 Nanocrystals with a Phase-transfer Method

Zhou Changhua1 Li Xiaomin1 Si Honglei1 Guo Yi2 Xu Li2 Zhang Zhijun1 Li Linsong*,1   

  1. (1Key Laboratory for Special Functional Materials of the Ministry of Education, Henan University, Kaifeng 475004)
    (2Key Laboratory for Molecular Enzymology and Engineering, Ministry of Education, Jilin University, Changchun 130021)
  • Received:2010-12-07 Revised:2011-01-22 Published:2011-02-11

Hydrophobic Fe3O4 nanocrystals with superparamagnetic behavior were synthesized in an organic solvent. High quality water-soluble Fe3O4 nanocrystals were then prepared by a phase transfer method, in which amphiphilic oligomers (polymaleic acid aliphatic amine ester) was used as surface coating agents. The obtained aqueous Fe3O4 nanocrystals were characterized with transmission electron microscopy, Fourier transform infrared spectroscopy, thermal gravimetric analysis, and dynamic light scattering. A solution of Fe3O4 nanocrystals in water showed expected superparamagnetic behavior when subjected to an external magnetic field. We found that hydrophobic ester chain length of the amphiphilic oligomer can dramatically affect the phase transfer efficiency, which was explained by the impact of local hydrophobic environment on the stability of nanocrystals in water. A biocompatible test showed that the water-soluble Fe3O4 were very stable in various physiological conditions without particle aggregation.

Key words: polymaleic acid aliphatic amine ester, water-soluble, phase transfer, Fe3O4 nanocrystals