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Nanocrystalline apatites: The fundamental role of water

Drouet, Christophe and Aufray, Maëlenn and Rollin-Martinet, Sabrina and Vandecandelaere, Nicolas and Grossin, David and Rossignol, Fabrice and Champion, Eric and Navrotsky, Alexandra and Rey, Christian Nanocrystalline apatites: The fundamental role of water. (2018) American Mineralogist, 103 (4). 550-564. ISSN 0003-004X

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Official URL: https://dx.doi.org/10.2138/am-2018-6415

Abstract

Bone is a natural nanocomposite. Its mineral component is nanocrystalline calcium phosphate apatite, whose synthetic biomimetic analogs can be prepared by wet chemistry. The initially formed crystals, whether biological or synthetic, exhibit very peculiar physicochemical features. In particular, they are nanocrystalline, nonstoichiometric, and hydrated. The surface of the nanocrystals is covered by a non-apatitic hydrated layer containing mobile ions, which may explain their exceptional surface reactivity. For their precipitation in vivo or in vitro, for their evolution in solution, for the 3D organization of the nanocrystals, and for their consolidation to obtain bulk ceramic materials, water appears to be a central component that has not received much attention. In this mini-review, we explore these key roles of water on the basis of physicochemical and thermodynamic data obtained by complementary tools including FTIR, XRD, ion titrations, oxide melt solution calorimetry, and cryo-FEG-SEM. We also report new data obtained by DSC, aiming to explore the types of water molecules associated with the nanocrystals. These data support the existence of two main types of water molecules associated with the nanocrystals, with different characteristics and probably different roles and functions. These findings improve our understanding of the behavior of bioinspired apatite-based systems for biomedi- cine and also of biomineralization processes taking place in vivo, at present and in the geologic past. This paper is thus intended to give an overview of the specificities of apatite nanocrystals and their close relationship with water.

Item Type:Article
Additional Information:Thanks to Mineralogical Society of America editor. The original PDF of the article can be found at American Mineralogist website : https://pubs.geoscienceworld.org/msa/ammin/article-abstract/103/4/550/529904/nanocrystalline-apatites-the-fundamental-role-of?redirectedFrom=fulltext
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Nationale Supérieure de Céramique Industrielle - ENSCI (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > University of California - UC Davis (USA)
Other partners > Université de Limoges - UNILIM (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Maelenn AUFRAY
Deposited On:11 Apr 2018 16:27

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