Uncovering the Role of Bicarbonate in Calcium Carbonate Formation at Near-Neutral pH.
Angew Chem Int Ed Engl
; 60(30): 16707-16713, 2021 07 19.
Article
em En
| MEDLINE
| ID: mdl-33973691
ABSTRACT
Mechanistic pathways relevant to mineralization are not well-understood fundamentally, let alone in the context of their biological and geological environments. Through quantitative analysis of ion association at near-neutral pH, we identify the involvement of HCO3- ions in CaCO3 nucleation. Incorporation of HCO3- ions into the structure of amorphous intermediates is corroborated by solid-state nuclear magnetic resonance spectroscopy, complemented by quantum mechanical calculations and molecular dynamics simulations. We identify the roles of HCO3- ions as being through (i)â
competition for ion association during the formation of ion pairs and ion clusters prior to nucleation and (ii)â
incorporation as a significant structural component of amorphous mineral particles. The roles of HCO3- ions as active soluble species and structural constituents in CaCO3 formation are of fundamental importance and provide a basis for a better understanding of physiological and geological mineralization.
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MEDLINE
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En
Ano de publicação:
2021
Tipo de documento:
Article