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Issue 26, 2015
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Disordered amorphous calcium carbonate from direct precipitation

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Abstract

Amorphous calcium carbonate (ACC) is known to play a prominent role in biomineralization. Different studies on the structure of biogenic ACCs have illustrated that they can have distinct short-range orders. However, the origin of so-called proto-structures in synthetic and additive-free ACCs is not well understood. In the current work, ACC has been synthesised in iso-propanolic media by direct precipitation from ionic precursors, and analysed utilising a range of different techniques. The data suggest that this additive-free type of ACC does not resemble clear proto-structural motifs relating to any crystalline polymorph. This can be explained by the undefined pH value in iso-propanolic media, and the virtually instantaneous precipitation. Altogether, this work suggests that aqueous systems and pathways involving pre-nucleation clusters are required for the generation of clear proto-structural features in ACC. Experiments on the ACC-to-crystalline transformation in solution with and without ethanol highlight that polymorph selection is under kinetic control, while the presence of ethanol can control dissolution re-crystallisation pathways.

Graphical abstract: Disordered amorphous calcium carbonate from direct precipitation

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Publication details

The article was received on 13 Apr 2015, accepted on 28 May 2015 and first published on 01 Jun 2015


Article type: Paper
DOI: 10.1039/C5CE00720H
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Citation: CrystEngComm, 2015,17, 4842-4849
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    Disordered amorphous calcium carbonate from direct precipitation

    M. Farhadi Khouzani, D. M. Chevrier, P. Güttlein, K. Hauser, P. Zhang, N. Hedin and D. Gebauer, CrystEngComm, 2015, 17, 4842
    DOI: 10.1039/C5CE00720H

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