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How similar are amorphous calcium carbonate and calcium phosphate? A comparative study of amorphous phases formation conditions

Buljan Meić, Iva; Kontrec, Jasminka; Domazet Jurašin, Darija; Selmani, Atiđa; Njegić Džakula, Branka; Maltar-Strmečki, Nadica; Lyons, Daniel Mark; Plodinec, Milivoj; Čeh, Miran; Gajović, Andreja; Dutour Sikirić, Maja; Kralj, Damir (2018) How similar are amorphous calcium carbonate and calcium phosphate? A comparative study of amorphous phases formation conditions. Crystengcomm, 20 . pp. 35-50. ISSN 1466-8033

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Abstract

Amorphous calcium carbonate (ACC) and calcium phosphate (ACP) increasingly attract attention as initial solid phases in vertebrate and invertebrate hard tissue formation, as well as in materials science as a possible new synthetic route for advanced materials preparation. Although much is known about these two amorphous phases and similarities in the mechanisms of their formation are recognized, no attempt has been made to investigate their formation under defined and comparable initial experimental conditions viz supersaturation, constituent ions ratio, ionic strength and presence of relevant inorganic additives. In this paper, the formation of ACC and ACP in three model precipitation systems of increased chemical complexity were investigated: (a) systems containing constituent ions, (b) systems containing additional co-ions, and (c) systems with higher ionic strength and addition of Mg2+. The results have shown that ACP is more stable and was formed at lower relative supersaturations in comparison to ACC. The precipitation domain of both phases expanded with increasing complexity of precipitation systems, with the ACP precipitation domains always being larger than that of ACC. In addition to stability, the presence of inorganic ions, especially Mg2+, influences the composition of both amorphous phases. The obtained results indicate that general similarity between ACC and ACP exists, but it could also be concluded that similar chemical environment in which they form not necessary lead to similar structural properties.

Item Type: Article
Uncontrolled Keywords: amorphous calcium carbonate ; amorphous calcium phosphate ; precipitation
Subjects: NATURAL SCIENCES > Physics
NATURAL SCIENCES > Chemistry
Divisions: Division of Materials Chemistry
Division of Physical Chemistry
Projects:
Project titleProject leaderProject codeProject type
Bioinspirirani materijali - mehanizmi nastajanja i interakcijaKralj, DamirIP-2013-11-5055HRZZ
Depositing User: Nadica Maltar Strmečki
Date Deposited: 07 Jun 2021 12:01
Last Modified: 07 Jun 2021 12:01
URI: http://fulir.irb.hr/id/eprint/6447
DOI: 10.1039/C7CE01693J

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