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Title: Disordered amorphous calcium carbonate from direct precipitation

Journal Article · · CrystEngComm
DOI:https://doi.org/10.1039/C5CE00720H· OSTI ID:1214327

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.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1214327
Journal Information:
CrystEngComm, Vol. 17, Issue 26; ISSN 1466-8033
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 46 works
Citation information provided by
Web of Science

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Cited By (10)

The Crystallization of Amorphous Calcium Carbonate is Kinetically Governed by Ion Impurities and Water journal February 2018
Wasser: Wie beeinflusst es die CaCO 3 ‐Bildung? journal November 2019
Water: How Does It Influence the CaCO 3 Formation? journal November 2019
Synthesis of calcium based nano powders for application in conservation and restoration of heritage mortar journal February 2020
Development of a novel CaCO 3 PILP based cementation method for quartz sand journal January 2019
Non-stoichiometric hydrated magnesium-doped calcium carbonate precipitation in ethanol journal January 2019
Microdynamic changes of moisture-induced crystallization of amorphous calcium carbonate revealed via in situ FTIR spectroscopy journal January 2019
In vivo characterization of bivalve larval shells: a confocal Raman microscopy study journal April 2018
Application of Different Fourier Transform Infrared (FT-IR) Methods in the Characterization of Lime-Based Mortars with Oxblood journal December 2018
Waste Bricks Applied as Removal Agent of Basic Blue 41 from Aqueous Solutions: Base Treatment and Their Regeneration Efficiency journal March 2019

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