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Elaboration et caractérisations de bioverres Si-Ca-Na-O et Si-Ca-Na-O-F dopés à l'azote

Abstract : This work presents the study of nitrogen addition in bioglasses of the system SiO2-Na2O-CaO. The purpose is to determine the effects of nitrogen addition on the physical and mechanical properties and the structure of oxynitride bioglasses based on the system Na2O-CaO-SiO2-Si3N4.In first time, the protocols of synthesis of these glasses were set up. The various elaborated glasses presented an amorphous and homogeneous structure. Analysis WDS confirmed the insertion of the nitrogen in these glasses. The addition of the fluorine in the composition of glasses allowed to keep themaximum of nitrogen in glasses. The glass transition temperature, density, hardness, elastic modulus and fracture toughness were measured and observed to increase linearly with nitrogen content. These increases are consistent withthe incorporation of N into the glass structure in three-fold coordination with silicon with result in extra cross-linking of the glass network. Structural studies by RMN-MAS of the 29Si for oxynitride glasses (Si-Na-Ca-O-N), and by RMN-MAS of the 29Si and the 19F for oxyfluoronitride glasses (Si-Na-Ca-N-O-F) and infrared spectroscopy have shown that all the N atoms are bonded to the Si atoms. The influence of the nitrogen inserted into glasses on the bioactivity was so studied. Finally, a bacteriological study was realized on oxynitride glasses and oxyfluoronitride glasses.
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Ahmed Bachar. Elaboration et caractérisations de bioverres Si-Ca-Na-O et Si-Ca-Na-O-F dopés à l'azote. Matériaux. Université de Valenciennes et du Hainaut-Cambresis; Université Mohammed V-Agdal (Rabat, Maroc ; 1993-2014), 2012. Français. ⟨NNT : 2012VALE0008⟩. ⟨tel-00789198⟩

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