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Water as the Key to...
Water as the Key to Proto-Aragonite Amorphous CaCO3
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Farhadi-Khouzani, Masoud (författare)
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Chevrier, Daniel M. (författare)
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Zhang, Peng (författare)
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- Hedin, Niklas (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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Gebauer, Denis (författare)
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(creator_code:org_t)
- 2016-06-02
- 2016
- Engelska.
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Ingår i: Angewandte Chemie International Edition. - : Wiley. - 1433-7851 .- 1521-3773. ; 55:28, s. 8117-8120
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Temperature and pH value can affect the short-range order of proto-structured and additive-free amorphous calcium carbonates (ACCs). Whereas a distinct change occurs in proto-vaterite (pv) ACC above 45 degrees C at pH 9.80, proto-calcite (pc) ACC (pH 8.75) is unaffected within the investigated range of temperatures (7-65 degrees C). IR and NMR spectroscopic studies together with EXAFS analysis showed that the temperature-induced change is related to the formation of proto-aragonite (pa) ACC. The data strongly suggest that the binding of water molecules induces dipole moments across the carbonate ions in pa-ACC as in aragonite, where the dipole moments are due to the symmetry of the crystal structure. Altogether, a (pseudo-)phase diagram of the CaCO3 polyamorphism in which water plays a key role can be formulated based on variables of state, such as the temperature, and solution parameters, such as the pH value.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Nyckelord
- amorphous calcium carbonate
- biomineralization
- NMR spectroscopy
- polyamorphism
- water
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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