Abstract
The effects of citrate ions on the formation of β- and α-FeOOH particles were investigated using various techniques. The formation and crystallization of both particles were inhibited by citrate ions, and their particle sizes decreased with increase in the concentration of these ions. Finally, aggregated amorphous particles were formed. The effects of citrate ions appeared to be more significant for β-FeOOH than for α-FeOOH. This difference could be explained by the pH dependence of the affinity of citrate ions to Fe3+ ions. The amorphous β-FeOOH particles prepared in the presence of > 10 mol% citrate ions selectively adsorbed water molecules.
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Kandori, K., Fukuoka, M. & Ishikawa, T. Effects of citrate ions on the formation of ferric oxide hydroxide particles. J Mater Sci 26, 3313–3319 (1991). https://doi.org/10.1007/BF01124679
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DOI: https://doi.org/10.1007/BF01124679