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

Lorena Falco; Mariana van den Tempel de Mendonca; Juan J. Mercadal; Valeriya Zarubina; Ignacio Melián-Cabrera

doi:10.1016/j.matlet.2016.04.179

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

Lorena Falco, Mariana van den Tempel de Mendonca, Juan J. Mercadal, Valeriya Zarubina, Ignacio Melián-Cabrera^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Pages (from-to)	91-94
Number of pages	4
Journal	Materials Letters
Volume	178
Early online date	26 Apr 2016
DOIs	https://doi.org/10.1016/j.matlet.2016.04.179
Publication status	Published - 1 Sept 2016

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.

Keywords

sol-gel
sintering
Lanthanum
thermal stability
phosphosilicate glasses
porous glasses

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10.1016/j.matlet.2016.04.179

Stabilisation by lanthanum addition
© 2016, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Accepted author manuscript, 876 KBLicence: CC BY-NC-ND 3.0

Cite this

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

abstract = "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.",

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author = "Lorena Falco and {van den Tempel de Mendonca}, Mariana and Mercadal, {Juan J.} and Valeriya Zarubina and Ignacio Meli{\'a}n-Cabrera",

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AU - Falco, Lorena

AU - van den Tempel de Mendonca, Mariana

AU - Mercadal, Juan J.

AU - Zarubina, Valeriya

AU - Melián-Cabrera, Ignacio

N1 - © 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.

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N2 - 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.

AB - 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.

KW - sol-gel

KW - sintering

KW - Lanthanum

KW - thermal stability

KW - phosphosilicate glasses

KW - porous glasses

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VL - 178

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EP - 94

JO - Materials Letters

JF - Materials Letters

ER -

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

Abstract

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Keywords

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