Water as the Key to Proto-Aragonite Amorphous CaCO3
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimTemperature 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 °C at pH 9.80, proto-calcite (pc) ACC (pH 8.7...
| Main Authors: | , , , , |
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| Format: | Journal Article |
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Wiley-VCH Verlag
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/52182 |
| _version_ | 1848758866215436288 |
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| author | Farhadi-Khouzani, M. Chevrier, D. Zhang, P. Hedin, N. Gebauer, Denis |
| author_facet | Farhadi-Khouzani, M. Chevrier, D. Zhang, P. Hedin, N. Gebauer, Denis |
| author_sort | Farhadi-Khouzani, M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimTemperature 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 °C at pH 9.80, proto-calcite (pc) ACC (pH 8.75) is unaffected within the investigated range of temperatures (7–65 °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. |
| first_indexed | 2025-11-14T09:50:47Z |
| format | Journal Article |
| id | curtin-20.500.11937-52182 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:50:47Z |
| publishDate | 2016 |
| publisher | Wiley-VCH Verlag |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-521822023-08-02T06:39:08Z Water as the Key to Proto-Aragonite Amorphous CaCO3 Farhadi-Khouzani, M. Chevrier, D. Zhang, P. Hedin, N. Gebauer, Denis © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimTemperature 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 °C at pH 9.80, proto-calcite (pc) ACC (pH 8.75) is unaffected within the investigated range of temperatures (7–65 °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. 2016 Journal Article http://hdl.handle.net/20.500.11937/52182 10.1002/anie.201603176 Wiley-VCH Verlag restricted |
| spellingShingle | Farhadi-Khouzani, M. Chevrier, D. Zhang, P. Hedin, N. Gebauer, Denis Water as the Key to Proto-Aragonite Amorphous CaCO3 |
| title | Water as the Key to Proto-Aragonite Amorphous CaCO3 |
| title_full | Water as the Key to Proto-Aragonite Amorphous CaCO3 |
| title_fullStr | Water as the Key to Proto-Aragonite Amorphous CaCO3 |
| title_full_unstemmed | Water as the Key to Proto-Aragonite Amorphous CaCO3 |
| title_short | Water as the Key to Proto-Aragonite Amorphous CaCO3 |
| title_sort | water as the key to proto-aragonite amorphous caco3 |
| url | http://hdl.handle.net/20.500.11937/52182 |