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Issue 39, 2019
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Microdynamic changes of moisture-induced crystallization of amorphous calcium carbonate revealed via in situ FTIR spectroscopy

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Abstract

Amorphous calcium carbonate (ACC) is the most important intermediate phase in the nucleation/crystallization process of CaCO3, and thus the proper interpretation of how ACC transforms into final crystals at the molecular level is crucial to understand various biomineralization phenomena. Herein, we successfully monitored the moisture-induced crystallization process of ACC via in situ FTIR spectroscopy, which is very sensitive to the specific changes of the different vibrational modes of carbonates and water molecules. In combination with the tools of perturbation correlation moving window and two-dimensional correlation spectroscopy, it is found that the driving force of ACC crystallization is the fracture of hydrogen bonds formed by H2O⋯CO32−. The bending vibrations of carbonate are more sensitive to moisture permeation than the stretching modes, and the whole crystallization process can be divided into three sequential stages, i.e., the hydrated ACC first loses its structural water and converts to the dehydrated ACC, which then gradually transforms into vaterite, followed by the final growth of vaterite crystals. Anhydrous ACC microdomains are found to be already existing in the as-prepared ACCs.

Graphical abstract: Microdynamic changes of moisture-induced crystallization of amorphous calcium carbonate revealed via in situ FTIR spectroscopy

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Publication details

The article was received on 10 Aug 2019, accepted on 06 Sep 2019 and first published on 06 Sep 2019


Article type: Paper
DOI: 10.1039/C9CP04440J
Phys. Chem. Chem. Phys., 2019,21, 21882-21889

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    Microdynamic changes of moisture-induced crystallization of amorphous calcium carbonate revealed via in situ FTIR spectroscopy

    M. Cheng, S. Sun and P. Wu, Phys. Chem. Chem. Phys., 2019, 21, 21882
    DOI: 10.1039/C9CP04440J

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