Publikation: Stable prenucleation calcium carbonate clusters
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2008
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Gebauer, Denis
Völkel, Antje
Cölfen, Helmut
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Science. 2008, 322(5909), pp. 1819-1822. ISSN 0036-8075. eISSN 1095-9203. Available under: doi: 10.1126/science.1164271
Zusammenfassung
Calcium carbonate forms scales, geological deposits, biominerals, and ocean sediments. Huge amounts of carbon dioxide are retained as carbonate ions, and calcium ions represent a major contribution to water hardness. Despite its relevance, little is known about the precipitation mechanism of calcium carbonate, and specified complex crystal structures challenge the classical view on nucleation considering the formation of metastable ion clusters. We demonstrate that dissolved calcium carbonate in fact contains stable prenucleation ion clusters forming even in undersaturated solution. The cluster formation can be characterized by means of equilibrium thermodynamics, applying a multiple-binding model, which allows for structural preformation. Stable clusters are the relevant species in calcium carbonate nucleation. Such mechanisms may also be important for the crystallization of other minerals.
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540 Chemie
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GEBAUER, Denis, Antje VÖLKEL, Helmut CÖLFEN, 2008. Stable prenucleation calcium carbonate clusters. In: Science. 2008, 322(5909), pp. 1819-1822. ISSN 0036-8075. eISSN 1095-9203. Available under: doi: 10.1126/science.1164271BibTex
@article{Gebauer2008-12-19Stabl-16657,
year={2008},
doi={10.1126/science.1164271},
title={Stable prenucleation calcium carbonate clusters},
number={5909},
volume={322},
issn={0036-8075},
journal={Science},
pages={1819--1822},
author={Gebauer, Denis and Völkel, Antje and Cölfen, Helmut}
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<dcterms:abstract xml:lang="eng">Calcium carbonate forms scales, geological deposits, biominerals, and ocean sediments. Huge amounts of carbon dioxide are retained as carbonate ions, and calcium ions represent a major contribution to water hardness. Despite its relevance, little is known about the precipitation mechanism of calcium carbonate, and specified complex crystal structures challenge the classical view on nucleation considering the formation of metastable ion clusters. We demonstrate that dissolved calcium carbonate in fact contains stable prenucleation ion clusters forming even in undersaturated solution. The cluster formation can be characterized by means of equilibrium thermodynamics, applying a multiple-binding model, which allows for structural preformation. Stable clusters are the relevant species in calcium carbonate nucleation. Such mechanisms may also be important for the crystallization of other minerals.</dcterms:abstract>
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