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Disordered amorphous calcium carbonate from direct precipitation
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Number of Authors: 7
2015 (English)In: CrystEngComm, ISSN 1466-8033, E-ISSN 1466-8033, Vol. 17, no 26, 4842-4849 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2015. Vol. 17, no 26, 4842-4849 p.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-119266DOI: 10.1039/c5ce00720hISI: 000356689400013OAI: oai:DiVA.org:su-119266DiVA: diva2:845031
Available from: 2015-08-10 Created: 2015-08-03 Last updated: 2017-12-04Bibliographically approved

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Hedin, Niklas
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Department of Materials and Environmental Chemistry (MMK)
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