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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (14): 1654-1660. 上一篇    下一篇

研究论文

可控粒径及一维链状纳米Fe3O4的制备

陈汝芬，宋珊珊，魏雨*   

  1. (河北师范大学化学与材料科学学院 石家庄 050016)
  • 投稿日期:2010-09-06 修回日期:2011-01-18 发布日期:2011-03-04
  • 通讯作者: 陈汝芬 E-mail:rufen@263.net
  • 基金资助:

    光催化氧化Fe(Ⅱ)反应体系对有机污染物催化降解的协同作用;可见光催化氧化制备纳米四氧化三铁及性能研究;光催化氧化合成超顺磁性纳米Fe3O4及磁场对其影响的研究

Preparation of Sized-controlled and One-dimensional Chain Nano-Fe3O4 Particles

(College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050016)   

  • Received:2010-09-06 Revised:2011-01-18 Published:2011-03-04

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采用氧化共沉淀相转化法, 控制适当的pH(9～11.5)和反应温度(20～100 ℃), 制备了不同粒径(20.6～45.0 nm)的纳米Fe3O4, 同时对纳米Fe3O4一维成链的影响因素进行了分析. 研究发现: 磁场强度和溶液的pH值对纳米Fe3O4一维成链有影响, 磁场强度在低于75 mT, pH值在9～11.5时, Fe3O4呈现一维链状排列, 且成链趋势随pH值的减小而增强. 纳米Fe3O4粒子的链状结构是由外部磁场和其表面电荷的协同效应影响的. 纳米Fe3O4均呈现出铁磁性行为, 一维链状纳米Fe3O4具有相对较大的矫顽力和剩磁.

关键词: 纳米Fe3O4, 粒径, 磁场, pH , 一维成链

The preparation of variable-sized (20.6～45.0 nm) Fe3O4 nanocrystals using oxidation- coprecipitation phase transformation, changing the pH values (9～11.5) and temperature (20～100 ℃) of the system was described. The effects of magnetic intensity and pH on the formation of the one-demensional (1D) Fe3O4 nano-particles were studied. The results showed that the magnetic fields and pH values can affect the assembly of the 1D Fe3O4 nano-particles. When the pH values were in the range of 9～11.5 under the external magnetic fields (＜75 mT), the Fe3O4 nano-particles showed the 1D chain structure. The tendency of the Fe3O4 1D chain increased with the decreasing of pH. The formation of the 1D chain structure was attributed to the synergy of the exterior magnetic fields and the surface charge of the Fe3O4 nano-particles. The Fe3O4 nanocrystals displayed ferromagnetic behavior. Fe3O4 particles with 1D chain structure have the higher coercivity and remanence.

Key words: nano-Fe3O4, size, magnetic field, pH, one-dimensional chain

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