DEGRAEVE, B.; LEFEUVRE, B.; ROCTON, N.; HERBERT, N.; HAMROUNI, N.; HAUSS, Grégory; LARGETEAU, Alain; PRAKASAM, Mythili; OUDADESSE, Hassane; MERDRIGNAC-CONANEC, Odile

doi:10.1016/j.ceramint.2022.03.078

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DEGRAEVE, B.
Institut des Sciences Chimiques de Rennes [ISCR]

LEFEUVRE, B.
Institut des Sciences Chimiques de Rennes [ISCR]

ROCTON, N.
Institut des Sciences Chimiques de Rennes [ISCR]

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Ceramics International. 2022-03, vol. 48, n° 13, p. 18190-18198

Elsevier

Résumé en anglais

Porous bioglass monoliths have been processed by hydrothermal hot pressing (HyHP) from sol-gel and melt-derived bioglass powders of composition (in mol %): SiO2–CaO–P2O5 (55.0-40.0-5.0) and SiO2–CaO–Na2O–P2O5 (47.2-26.4-23.8-2.6), respectively. An open porosity of >70% ever reached in 3D structures is reported for monoliths issued from sol-gel powders. Dissolution studies were performed in simulated body fluid (SBF) for 1–30 days. The monoliths were analysed using X-Ray Diffraction (XRD), Fourier Transform Infra-Red (FTIR) spectroscopy and Scanning Electron Microscopy (SEM) to observe the formation of an apatite-like layer and elemental concentration of SBF was evaluated using Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). A higher kinetics in the development of apatite layer was observed for sol-gel derived monoliths. This result is explained by the high surface areas of the nanosized sol-gel powders and the possibility of HyHP to create large porosity (mesoporous monoliths) and retain large surface areas. HyHP is also effective in processing 3D-bioglass structures with porosity gradient by co-sintering powders of different size.< Réduire

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Hydrothermal hot pressing

Sol-gel derived bioglass

Highly porous monolith

Melt-derived bioglass

Sintering

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Processing of highly porous bioglass monoliths by hydrothermal hot pressing

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