The formation process of spindle beta-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, [beta-FeOOH] nuclies would grow up through the diffusion mechanism. The beta-FeOOH particles were smaller and uniform under the effect of CTAB. The spindle and needle-like beta-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.
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