Details
| Titel in Übersetzung | Wasser als Schlüssel zu amorphem Proto-Aragonit-CaCO3 |
|---|---|
| Originalsprache | Englisch |
| Seiten (von - bis) | 8117-8120 |
| Seitenumfang | 4 |
| Fachzeitschrift | Angewandte Chemie-International Edition |
| Jahrgang | 55 |
| Ausgabenummer | 28 |
| Frühes Online-Datum | 2 Juni 2016 |
| Publikationsstatus | Veröffentlicht - 5 Juli 2016 |
| Extern publiziert | Ja |
Abstract
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 °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 CaCO 3polyamorphism 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.
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- Allgemeine Chemie
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in: Angewandte Chemie-International Edition, Jahrgang 55, Nr. 28, 05.07.2016, S. 8117-8120.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Water as the Key to Proto-Aragonite Amorphous CaCO3
AU - Farhadi-Khouzani, Masoud
AU - Chevrier, Daniel M.
AU - Zhang, Peng
AU - Hedin, Niklas
AU - Gebauer, Denis
N1 - Funding information: D.G. is a Research Fellow of the Zukunftskolleg of the University of Konstanz and supported by the Fonds der Chemischen Industrie. N.H. thanks the Swedish Energy Agency for support, and the Swedish Research Council and the Knut and Alice Wallenberg Foundation for NMR equipment grants. D.M.C. is supported by an NSERC CGS Alexander Graham Bell scholarship. P.Z. acknowledges support from NSERC Canada. The CLS@APS (Sector 20-BM) facilities at the APS are supported by the U.S. DOE, Basic Energy Sciences, NSERC Canada, the University of Washington, the CLS, and the APS. Use of the APS was supported by the U.S. DOE (DEAC02-06CH11357). Technical assistance was provided by Dr. Robert Gordon and Dr. Zou Finfrock.
PY - 2016/7/5
Y1 - 2016/7/5
N2 - 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 °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 CaCO 3polyamorphism 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.
AB - 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 °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 CaCO 3polyamorphism 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.
KW - amorphous calcium carbonate
KW - biomineralization
KW - NMR spectroscopy
KW - polyamorphism
KW - water
UR - http://www.scopus.com/inward/record.url?scp=84985993103&partnerID=8YFLogxK
U2 - 10.1002/ange.201603176
DO - 10.1002/ange.201603176
M3 - Article
VL - 55
SP - 8117
EP - 8120
JO - Angewandte Chemie-International Edition
JF - Angewandte Chemie-International Edition
SN - 1521-3757
IS - 28
ER -