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Physico-chemical properties of nanocrystalline apatites: Implications for biominerals and biomaterials

Rey, Christian and Combes, Christèle and Drouet, Christophe and Sfihi, Hocine and Barroug, Allal Physico-chemical properties of nanocrystalline apatites: Implications for biominerals and biomaterials. (2007) Materials Science and Engineering C, vol. 27 (n° 2). pp. 198-205. ISSN 0928-4931

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Official URL: http://dx.doi.org/10.1016/j.msec.2006.05.015

Abstract

Nanocrystalline apatites play an important role in biomineralisation and they are used as bioactive biominerals for orthopaedic applications. One of the most interesting characteristics of the nanocrystals, evidenced by spectroscopic methods, is the existence of a structured surface hydrated layer, well developed in freshly formed precipitates, which becomes progressively transformed into the more stable apatitic lattice upon ageing in aqueous media. The hydrated layer is very fragile and irreversibly altered upon drying. Several routes leading to different apatite compositions are found in biological systems. The loosely bound ions of the hydrated layer can be easily and reversibly substituted by other ions in fast aqueous ion exchange reactions. These ions can either be included in the growing stable apatite lattice during the ageing process or remain in the hydrated layer. The adsorption properties of nanocrystals appear to be strongly dependent on the composition of the hydrated layer and on ageing. The surface reactivity of the apatite nanocrystals can play a part in different biomaterials and could explain the setting reactions of biomimetic calcium phosphate cements and the possibility of obtaining adherent nanocrystalline coatings on different substrates.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Materials Science and Engineering C website : http://www.sciencedirect.com/science/journal/09284931
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Ecole Supérieure de Physique et de Chimie Industrielles - ESPCI (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > University of Cadi Ayyad - UCAM (MOROCCO)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Celine Cabaup

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