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Study on the Formation Process of Spindle β-FeOOH Particles
Zhang Xia1, Zhao Yan2, Zhang Caibei1
1.School of Science, Northeastern University, Shenyang 110004;2.Institute of Metal Research, Chinese Academy of Science, Shenyang 110016
Abstract:
The formation process of spindle 2-FeOOH particles obtained through the hydrolysis of FeCl3 solutions has been investigated by means of TEM and XRD. The effect of surfactant-Hexadecyl trimethyl ammonium bromide(CTAB) on this process has also been studied. The results show that growth of the needle-like pre-particles is based on the aggregation process, when there is no CTAB in the FeCl3 solution. Once CTAB was added, [2-FeOOH] nuclies would grow up through the diffusion mechanism. The2-FeOOH particles were smaller and uniform under the effect of CTAB. The spindle and needle-like 2-FeOOH particles with different axis ratios can be synthesized by controlling the reaction parameters such as the concentration of the original FeCl3 solution and aging temperature.
Key words:  Spindle, 2-FeOOH, Surfactant, CTAB, Formation process
FundProject:
纺锤形β-FeOOH的形成过程研究
张霞1, 赵岩2, 张彩碚*1
1.东北大学理学院,沈阳,110004;2.中国科学院金属研究所,沈阳,110016
摘要:
应用透射电镜技术观察了FeCl3水解形成纺锤形β-FeOOH过程中颗粒的形貌变化,发现纺锤形β-FeOOH颗粒是由针形初级粒子沿长轴聚集长大形成的.加入表面活性剂十六烷基三甲基溴化铵(CTAB)后,β-FeOOH 形成机制发生改变, β-FeOOH晶核通过扩散过程而长成纺锤形颗粒.CTAB的存在使β-FeOOH颗粒变小而且粒径更均匀.改变反应条件包括起始FeCl3的浓度、陈化温度,得到了纺锤形和针形、不同轴比的单分散β-FeOOH.
关键词:  纺锤形  β-FeOOH  表面活性剂  CTAB  形成过程
DOI:10.1088/1674-0068/17/5/613-617
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