Mixed calcium-magnesium pre-nucleation clusters enrich calcium

Verch, Andreas; Antonietti, Markus; Cölfen, Helmut

Mixed calcium-magnesium pre-nucleation clusters enrich calcium

Dateien

Verch_226336.pdfGröße: 727.56 KBDownloads: 452

Datum

2012

Autor:innen

Verch, Andreas

Antonietti, Markus

Cölfen, Helmut

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

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.

Fachgebiet (DDC)

540 Chemie

Schlagwörter

Pre-nucleation cluster, amorphous calcium carbonate, preferential ion binding, Mg-Calcite, non classical nucleation

Zitieren

ISO 690

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.2012.1529

BibTex

@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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