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    The effect of phosphonate-based growth modifiers on the morphology of hematite nanoparticles formed via acid hydrolysis of ferric chloride solutions

    19325_downloaded_stream_417.pdf (311.4Kb)
    Access Status
    Open access
    Authors
    Jones, Franca
    Ogden, Mark
    Oliveira, Allan
    Parkinson, Gordon
    Richmond, William
    Date
    2003
    Type
    Journal Article
    
    Metadata
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    Citation
    Jones, Franca and Ogden, Mark I. and Oliveira, Allan and Parkinson, Gordon M. and Richmond, William R.. 2003. The effect of phosphonate-based growth modifiers on the morphology of hematite nanoparticles formed via acid hydrolysis of ferric chloride solutions. CrystEngComm 5 (30): 159-163.
    Source Title
    CrystEngComm
    Additional URLs
    http://www.rsc.org/Publishing/Journals/CE/article.asp?doi=b302911e
    http://xlink.rsc.org/?DOI=b302911e
    Faculty
    Research Centres
    Curtin
    Cooperative Research Centres
    A.J. Parker CRC for Hydrometallurgy
    Nanochemistry Research Centre
    School
    Nanochemistry Research Institute
    Remarks

    This article was originally published by the Royal Society of Chemistry.

    It may not be further made available or distributed.

    URI
    http://hdl.handle.net/20.500.11937/9919
    Collection
    • Curtin Research Publications
    Abstract

    The effect of organic phosphonate-based additives on a-Fe2O3 (hematite) crystallization via the forced hydrolysis of ferric chloride solutions has been studied using a range of additives containing 2, 3 or 4 pendant phosphonate groups. The hydrolysis reactions were carried out at pH 1.1 with an iron concentration of 0.01 mol L21, and with Fe : additive ratios ranging from w8000 : 1 down to 200 : 1. In the absence of additive, the hematite particles are very uniform rhombic single crystals, with an average length of #100 nm. In the presence of phosphonates the particles become hexagonal, with the additives acting by inhibiting growth at (214 ) faces. At Fe : additive ratios lower than about 200 : 1, hematite formation is completely inhibited. Our results are consistent with a mechanism in which the akaganeite and hematite phases may both precipitate from the ferric chloride solution, with akaganeite apparently forming more rapidly than hematite. Inhibition of hematite formation by addition of the phosphonate additive can lead to b-FeOOH (akaganeite) being the dominant product phase, provided the concentration of Fe31 in solution is above the equilibrium solubility of the akaganeite phase.

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