Publikation: Mixed calcium-magnesium pre-nucleation clusters enrich calcium
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2012
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Zeitschrift für Kristallographie - Crystalline Materials. 2012, 227(11), pp. 718-722. ISSN 2194-4946. Available under: doi: 10.1524/zkri.2012.1529
Zusammenfassung
It is demonstrated that magnesium and carbonate ions can form pre-nucleation clusters in analogy to calcium carbonate. If a mixed calcium and magnesium solution is brought in contact with carbonate ions, mixed pre-nucleation clusters form. The equilibrium constants for their formation are reported revealing that over the entire range of possible cation mixing ratios, calcium gets enriched over magnesium in the pre-nucleation clusters. This can explain high magnesium contents in amorphous calcium carbonate. However, this enrichment alone is not sufficient to explain the magnesium content of less than 41 mol% which is found in magnesium calcite biominerals nucleated from seawater.
Zusammenfassung in einer weiteren Sprache
Fachgebiet (DDC)
540 Chemie
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Pre-nucleation cluster, amorphous calcium carbonate, preferential ion binding, Mg-Calcite, non classical nucleation
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VERCH, Andreas, Markus ANTONIETTI, Helmut CÖLFEN, 2012. Mixed calcium-magnesium pre-nucleation clusters enrich calcium. In: Zeitschrift für Kristallographie - Crystalline Materials. 2012, 227(11), pp. 718-722. ISSN 2194-4946. Available under: doi: 10.1524/zkri.2012.1529BibTex
@article{Verch2012Mixed-22633, year={2012}, doi={10.1524/zkri.2012.1529}, title={Mixed calcium-magnesium pre-nucleation clusters enrich calcium}, number={11}, volume={227}, issn={2194-4946}, journal={Zeitschrift für Kristallographie - Crystalline Materials}, pages={718--722}, author={Verch, Andreas and Antonietti, Markus and Cölfen, Helmut} }
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