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    Distinct Short-Range Order Is Inherent to Small Amorphous Calcium Carbonate Clusters (<2 nm)

    Access Status
    Fulltext not available
    Authors
    Sun, S.
    Chevrier, D.
    Zhang, P.
    Gebauer, Denis
    Cölfen, H.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Sun, S. and Chevrier, D. and Zhang, P. and Gebauer, D. and C�lfen, H. 2016. Distinct Short-Range Order Is Inherent to Small Amorphous Calcium Carbonate Clusters (<2 nm). Angewandte Chemie - International Edition. 55 (40): pp. 12206-12209.
    Source Title
    Angewandte Chemie - International Edition
    DOI
    10.1002/anie.201604179
    ISSN
    1433-7851
    School
    Department of Chemistry
    URI
    http://hdl.handle.net/20.500.11937/52935
    Collection
    • Curtin Research Publications
    Abstract

    © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimAmorphous intermediate phases are vital precursors in the crystallization of many biogenic minerals. While inherent short-range orders have been found in amorphous calcium carbonates (ACCs) relating to different crystalline forms, it has never been clarified experimentally whether such orders already exist in very small clusters less than 2 nm in size. Here, we studied the stability and structure of 10,12-pentacosadiynoic acid (PCDA) protected ACC clusters with a core size of ca. 1.4 nm consisting of only seven CaCO3 units. Ligand concentration and structure are shown to be key factors in stabilizing the ACC clusters. More importantly, even in such small CaCO3 entities, a proto-calcite short-range order can be identified but with a relatively high degree of disorder that arises from the very small size of the CaCO3 core. Our findings support the notion of a structural link between prenucleation clusters, amorphous intermediates, and final crystalline polymorphs, which appears central to the understanding of polymorph selection.

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