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    Understanding the mechanism by which nitrilotriacetic acid interacts with precipitating barium sulfate

    19857_downloaded_stream_375.pdf (551.8Kb)
    Access Status
    Open access
    Authors
    Jones, Franca
    Oliveira, Allan
    Rohl, Andrew
    Ogden, Mark
    Parkinson, Gordon
    Date
    2006
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Jones, Franca and Oliveira, Allan and Rohl, Andrew L. and Ogden, Mark I. and Parkinson, Gordon M.. 2006. Understanding the mechanism by which nitrilotriacetic acid interacts with precipitating barium sulfate. CrystEngComm 8 (12): 869-876.
    Source Title
    CrystEngComm
    Additional URLs
    http://xlink.rsc.org/?DOI=b608302a
    http://www.rsc.org/publishing/journals/CE/article.asp?doi=b608302a
    Faculty
    Research Centres
    Cooperative Research Centres
    A.J. Parker CRC for Hydrometallurgy
    Division of Engineering, Science and Computing
    Department of Applied Chemistry
    Curtin
    Nanochemistry Research Centre
    Faculty of Science
    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/20.500.11937/19461
    Collection
    • Curtin Research Publications
    Abstract

    Morphology modifiers can act in many different ways on the precipitating phase. Inhibitors can alter the solution chemistry and thereby change the supersaturation, they may adsorb onto the surface and block growth and agglomeration, they may alter the ritical nucleus and affect nucleation or they may do a combination of these three. revious work showing that nitrilotriacetic acid (NTA) had a significant effect on barium sulfate precipitation has been expanded upon in order to determine the mechanism by which the observed morphology modification occurs. The absence of significant complexation to barium at the pH of the experiment suggests that NTA affects the critical nuclei of the precipitating barium sulfate. This results in the longer induction times observed using nephelometry, and adsorption onto growth features is probably the mechanism of interaction. Molecular modelling shows that NTA adsorption is favourable on terraces and that hydrogen bonding improves the ability of an additive to adsorb. A fundamental nderstanding of the mechanisms by which additives affect crystal growth is essential if new additives, with predictable effect, are to be designed a priori.

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