Processing of highly porous bioglass monoliths by hydrothermal hot pressing. Issue 13 (1st July 2022)

• Record Type: Journal Article
• Authors: Degraeve, B.; Lefeuvre, B.; Rocton, N.; Herbert, N.; Hamrouni, N.; Hauss, G.; Largeteau, A.; Prakasam, M.; Oudadesse, H.; Merdrignac-Conanec, O.
• Is Part Of: Ceramics international. Volume 48:Issue 13(2022)
• Page Start: 18190
• Page End: 18198
• Publication Date: 2022-07-01
• Subjects: Highly porous monolith -- Hydrothermal hot pressing -- Sol-gel derived bioglass -- Melt-derived bioglass -- Sintering; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.03.078
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: 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–P2 O5 (55.0-40.0-5.0) and SiO2 –CaO–Na2 O–P2 O5 (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.