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Issue 1, 2011
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The kinetics and mechanisms of amorphous calcium carbonate (ACC) crystallization to calcite, viavaterite.

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Abstract

The kinetics and mechanisms of nanoparticulate amorphous calcium carbonate (ACC) crystallization to calcite, viavaterite, were studied at a range of environmentally relevant temperatures (7.5–25 °C) using synchrotron-based in situ time-resolved Energy Dispersive X-ray Diffraction (ED-XRD) in conjunction with high-resolution electron microscopy, ex situX-ray diffraction and infrared spectroscopy. The crystallization process occurs in two stages; firstly, the particles of ACC rapidly dehydrate and crystallize to form individual particles of vaterite; secondly, the vaterite transforms to calcitevia a dissolution and reprecipitation mechanism with the reaction rate controlled by the surface area of calcite. The second stage of the reaction is approximately 10 times slower than the first. Activation energies of calcite nucleation and crystallization are 73 ± 10 and 66 ± 2 kJ mol−1, respectively. A model to calculate the degree of calcite crystallization from ACC at environmentally relevant temperatures (7.5–40 °C) is also presented.

Graphical abstract: The kinetics and mechanisms of amorphous calcium carbonate (ACC) crystallization to calcite, viavaterite.

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Publication details

The article was received on 13 Aug 2010, accepted on 06 Oct 2010 and first published on 10 Nov 2010


Article type: Paper
DOI: 10.1039/C0NR00589D
Citation: Nanoscale, 2011,3, 265-271
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    The kinetics and mechanisms of amorphous calcium carbonate (ACC) crystallization to calcite, viavaterite.

    J. D. Rodriguez-Blanco, S. Shaw and L. G. Benning, Nanoscale, 2011, 3, 265
    DOI: 10.1039/C0NR00589D

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