Preparation of γ-Fe2O3/ZnFe2O4 nanoparticles by enhancement of surface modification with NaOH

Chemistry Central Journal

Longlong Chen²  Jian Li²  Yueqiang Lin²  Xiaodong Liu²  Junming Li²  Xiaomin Gong²  Decai Li¹ 

[1] School of Mechanical & Control Engineering, Beijing Jiaotong University, Beijing 100044, People's Republic of China

[2] School of Physical Science & Technology, Southwest University, Chongqing 400715, People's Republic of China

关键词: ZnFe2O4;    γ-Fe2O3;    Surface modification;    Composite;    Nanoparticles;   

Others  :  787771
DOI  :  10.1186/1752-153X-8-40

 received in 2014-03-11, accepted in 2014-06-16,  发布年份 2014

【 摘 要 】

Background

During liquid-phase synthesis of γ-Fe₂O₃ nanoparticles by chemically induced transition in FeCl₂ solution, enhancement of surface modification by adding ZnCl₂ was attempted by using NaOH. By using transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectrometry, and vibrating sample magnetometry, the dependence of the synthesis on the amount of additional NaOH was studied.

Results

The experimental results show that the surface of the γ-Fe₂O₃ nanoparticles could be modified by adding ZnCl₂ to form composite nanoparticles with γ-Fe₂O₃/ZnFe₂O₄ ferrite core coated with Zn(OH)₂ and adsorbed FeCl₃, and that modification could be enhanced by adding NaOH.

Conclusions

In the experimental conditions, when the concentration of additional NaOH was below 0.70 M, the amounts of ZnFe₂O₄ and Zn(OH)₂ phases increased slightly and that of adsorbed FeCl₃ was unchanged. When the concentration of NaOH exceeded 0.70 M, the amount of FeCl₃, ZnFe₂O₄, and Zn(OH)₂ increased.

【 授权许可】

   
2014 Chen et al.; licensee Chemistry Central Ltd.

【 图 表 】

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