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 .
The formation process of spindle β-FeOOH particles obtained through the hydrolysis of FeCl 3 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 FeCl 3 solution. Once CTAB was added, \ nuclies would grow up through the diffusion mechanism. The β-FeOOH particles were smaller and uniform under the effect of CTAB. The spindle and needle-like β-FeOOH particles with different axis ratios can be synthesized by controlling the reaction parameters such as the concentration of the original FeCl 3 solution and aging temperature.
基金
ProjectsupportedbytheNationalNaturalScienceFoundationofChina (5 0 2 0 2 0 14 ) .
