Calcium carbonate crystallisation at charged graphite surfaces

Calcium carbonate crystallisation on surfaces has been studied extensively due to its prominence in biomineralisation, but the role of surface charge in nucleation and growth is not well understood. We have employed potential-controlled Highly Oriented Pyrolytic Graphite (HOPG) surfaces to demonstra...

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Bibliographic Details
Published inChemical communications (Cambridge, England) Vol. 53; no. 93; pp. 12552 - 12555
Main Authors Ravenhill, E R, Adobes-Vidal, M, Unwin, P R
Format Journal Article
LanguageEnglish
Published England Royal Society of Chemistry 2017
Subjects
Aragonite
Calcite
Calcium carbonate
Crystallization
Graphite
Pyrolytic graphite
Surface charge
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Summary:Calcium carbonate crystallisation on surfaces has been studied extensively due to its prominence in biomineralisation, but the role of surface charge in nucleation and growth is not well understood. We have employed potential-controlled Highly Oriented Pyrolytic Graphite (HOPG) surfaces to demonstrate the significant impact of surface charge on calcium carbonate crystallisation: at negatively charged HOPG surfaces, calcite, aragonite and vaterite all nucleate from high energy positively-charged crystal faces, contrasting with the stable (104) calcite planes nucleated at positively charged surfaces. These observations are explained and rationalised.
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ISSN:1359-7345
1364-548X
DOI:10.1039/c7cc07441g