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Development of a new family of monolithic calcium (pyro)phosphate glasses by soft chemistry

Soulié, Jérémy and Gras, Pierre and Marsan, Olivier and Laurencin, Danielle and Rey, Christian and Combes, Christèle Development of a new family of monolithic calcium (pyro)phosphate glasses by soft chemistry. (2016) Acta Biomaterialia, 41. 320-327. ISSN 1742-7061

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Official URL: https://doi.org/10.1016/j.actbio.2016.05.030

Abstract

The development of bioactive phosphate-based glasses is essential in biomaterials science, and especially for bone substitution applications. In this context, the preparation of amorphous calcium-phosphorus hydroxide/oxide monoliths at low temperature is a key challenge for being able to develop novel hybrid materials for these applications. We herein report for the first time the synthesis and physical chemical characterisation of a novel family of pyrophosphate-based glasses (with the formula: {[(Ca2+)1−x(H+/K+)2x]2[(P2O74−)1−y(PO43−)4y/3]} n(H2O)), which were prepared by soft chemistry using low temperatures (T<70°C) and water as a solvent. The effect of the initial Ca/Pyrophosphate ratio on the structure and morphology of these pyrophosphate glasses was investigated in detail. Depending on this ratio, a glass (mixed calcium pyro- and orthophosphate) or a glass-ceramic (Ca10K4(P2O7)6•9H2O crystals embedded in the amorphous phase) was obtained. The proportion of the crystalline phase increased with an increase in the Ca/Pyrophosphate ratio in the batch solution. As expected for a glass, the formation of the glassy material was demonstrated not to be thermodynamically but rather kinetically driven, and the washing step was found to be crucial to prevent crystallisation. The stability of the amorphous phase was discussed considering the structural degrees of freedom of pyrophosphate entities, ionic strength of the initial solution and the inhibitory effect of orthophosphate ions. Overall, this new strategy of preparation of monolithic calcium-(pyro)phosphate based glasses using soft chemistry in water is highly promising in view of preparing new functional organic-inorganic hybrids for bone substitution applications.

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 : http://www.sciencedirect.com/science/article/pii/S1742706116302483?via%3Dihub
HAL Id:hal-01361844
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 Chimie de Montpellier - ENSCM (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université de Montpellier 1 (FRANCE)
Other partners > Université de Montpellier 2 (FRANCE)
Other partners > Université de Montpellier (FRANCE)
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Deposited By: Christele COMBES
Deposited On:23 Oct 2017 10:17

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