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Thermal stability of porous sol-gel phosphosilicates and their surface area stabilisation by lanthanum addition

Falco, L., De Mendonca, M. V. D. T., Mercadal, J. J., Zarubina, V. & Melián-Cabrera, I., 1-Sep-2016, In : Materials Letters. 178, p. 91-94 4 p.

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  • Thermal stability

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DOI

  • Lorena Falco
  • Mariana Van Den Tempel De Mendonca
  • Juan J. Mercadal
  • Valeriya Zarubina
  • Ignacio Melián-Cabrera

The thermal stability of porous sol-gel phosphosilicates was studied by comparing the textural features upon calcination between 400 and 550 degrees 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. (C) 2016 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)91-94
Number of pages4
JournalMaterials Letters
Volume178
Publication statusPublished - 1-Sep-2016

    Keywords

  • Sol-gel, Porous glasses, Phosphosilicate glasses, Thermal stability, Lanthanum, Sintering, IN-VITRO, GLASSES, ALUMINA

ID: 36199840