The thermal stability of porous sol-gel phosphosilicates was studied by comparing the textural features upon calcination between 400 and 550 °C. A significant loss of surface area and pore volume were observed; the first is due to thermal coarsening of the nanoparticles, and the pore volume reduction was ascribed to sintering of the most external nanoparticles producing less void volume. Lanthanum addition was investigated as thermal stabilizer. For the mesoporous phosphosilicate composition, lanthanum addition enhanced the surface area, showing a 45% and 50% improvement with respect to the La-free counterpart; the effect was much less visible for the macroporous composition.
Bibliographical note© 2016, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Supplementary data availalbe on the journal website.
- thermal stability
- phosphosilicate glasses
- porous glasses
Falco, L., van den Tempel de Mendonca, M., Mercadal, J. J., Zarubina, V., & Melián-Cabrera, I. (2016). Thermal stability of porous sol-gel phosphosilicates and their surface area stabilisation by lanthanum addition. Materials Letters, 178, 91-94. https://doi.org/10.1016/j.matlet.2016.04.179