Simulation of calcium phosphate prenucleation clusters in aqueous solution: association beyond Ion pairing

Natalya A. Garcia, Riccardo Innocenti Malini, Colin L. Freeman, Raffaella Demichelis, Paolo Raiteri (Corresponding author), Nico A.J.M. Sommerdijk, John H. Harding, Julian D. Gale

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

11 Citaten (Scopus)
25 Downloads (Pure)

Samenvatting

Classical molecular dynamics simulations and free energy methods have been used to obtain a better understanding of the molecular processes occurring prior to the first nucleation event for calcium phosphate biominerals. The association constants for the formation of negatively charged complexes containing calcium and phosphate ions in aqueous solution have been computed, and these results suggest that the previously proposed calcium phosphate building unit, [Ca(HPO4)3]4-, should only be present in small amounts under normal experimental conditions. However, the presence of an activation barrier for the removal of an HPO4 2- ion from this complex indicates that this species could be kinetically trapped. Aggregation pathways involving CaHPO4, [Ca(HPO4)2]2-, and [Ca(HPO4)3]4- complexes have been explored with the finding that dimerization is favorable up to a Ca/HPO4 ratio of 1:2.

Originele taal-2Engels
Pagina's (van-tot)6422-6430
Aantal pagina's9
TijdschriftCrystal Growth and Design
Volume19
Nummer van het tijdschrift11
DOI's
StatusGepubliceerd - nov 2019

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