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Journal Articles Ceramics International Year : 2022

Processing of highly porous bioglass monoliths by hydrothermal hot pressing

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–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.
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Dates and versions

hal-03643101 , version 1 (01-06-2022)

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B. Degraeve, B. Lefeuvre, N. Rocton, N. Herbert, N. Hamrouni, et al.. Processing of highly porous bioglass monoliths by hydrothermal hot pressing. Ceramics International, 2022, 48 (13), pp.18190-18198. ⟨10.1016/j.ceramint.2022.03.078⟩. ⟨hal-03643101⟩
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