Preparation and properties of aluminosilicate aerogels from boehmite and waterglass

Marta Ocejo; Eunate Goiti; Juan Salinas-Garzón; José Antonio Ibáñez-Gómez

doi:10.1016/j.matchemphys.2024.128912

Preparation and properties of aluminosilicate aerogels from boehmite and waterglass

Marta Ocejo, Eunate Goiti^*, Juan Salinas-Garzón, José Antonio Ibáñez-Gómez

^*Corresponding author for this work

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

2 Citations (Scopus)

Abstract

Aluminosilicate aerogels are promising thermal insulation materials for high temperature applications. In this study, aluminosilicate aerogels were effectively synthesised using affordable precursors: dispersible boehmite powder and waterglass solutions, with subsequent drying achieved by supercritical CO₂ processing. According to the evaluation of their properties, the Al–Si aerogels exhibited low densities (0.11 g/cm³), low thermal conductivities (<0.021 W/m·K) and high specific surface areas (SSA) (516 m²/g for an Al:Si molar ratio of 3:1). When waterglass-based aerogel and aluminosilicate samples were treated at high temperature (1200 °C), the formation of mullite was demonstrated for the aluminosilicate aerogel with a molar ratio of Al:Si 3:1, which showed a higher value for SSA compared to the waterglass-based aerogel.

Original language	English
Article number	128912
Journal	Materials Chemistry and Physics
Volume	315
DOIs	https://doi.org/10.1016/j.matchemphys.2024.128912
Publication status	Published - 1 Mar 2024

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

Keywords

Aerogel
Boehmite
Thermal properties
Waterglass

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10.1016/j.matchemphys.2024.128912

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title = "Preparation and properties of aluminosilicate aerogels from boehmite and waterglass",

abstract = "Aluminosilicate aerogels are promising thermal insulation materials for high temperature applications. In this study, aluminosilicate aerogels were effectively synthesised using affordable precursors: dispersible boehmite powder and waterglass solutions, with subsequent drying achieved by supercritical CO2 processing. According to the evaluation of their properties, the Al–Si aerogels exhibited low densities (0.11 g/cm3), low thermal conductivities (<0.021 W/m·K) and high specific surface areas (SSA) (516 m2/g for an Al:Si molar ratio of 3:1). When waterglass-based aerogel and aluminosilicate samples were treated at high temperature (1200 °C), the formation of mullite was demonstrated for the aluminosilicate aerogel with a molar ratio of Al:Si 3:1, which showed a higher value for SSA compared to the waterglass-based aerogel.",

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author = "Marta Ocejo and Eunate Goiti and Juan Salinas-Garz{\'o}n and Ib{\'a}{\~n}ez-G{\'o}mez, {Jos{\'e} Antonio}",

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doi = "10.1016/j.matchemphys.2024.128912",

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AU - Ocejo, Marta

AU - Goiti, Eunate

AU - Salinas-Garzón, Juan

AU - Ibáñez-Gómez, José Antonio

PY - 2024/3/1

Y1 - 2024/3/1

N2 - Aluminosilicate aerogels are promising thermal insulation materials for high temperature applications. In this study, aluminosilicate aerogels were effectively synthesised using affordable precursors: dispersible boehmite powder and waterglass solutions, with subsequent drying achieved by supercritical CO2 processing. According to the evaluation of their properties, the Al–Si aerogels exhibited low densities (0.11 g/cm3), low thermal conductivities (<0.021 W/m·K) and high specific surface areas (SSA) (516 m2/g for an Al:Si molar ratio of 3:1). When waterglass-based aerogel and aluminosilicate samples were treated at high temperature (1200 °C), the formation of mullite was demonstrated for the aluminosilicate aerogel with a molar ratio of Al:Si 3:1, which showed a higher value for SSA compared to the waterglass-based aerogel.

AB - Aluminosilicate aerogels are promising thermal insulation materials for high temperature applications. In this study, aluminosilicate aerogels were effectively synthesised using affordable precursors: dispersible boehmite powder and waterglass solutions, with subsequent drying achieved by supercritical CO2 processing. According to the evaluation of their properties, the Al–Si aerogels exhibited low densities (0.11 g/cm3), low thermal conductivities (<0.021 W/m·K) and high specific surface areas (SSA) (516 m2/g for an Al:Si molar ratio of 3:1). When waterglass-based aerogel and aluminosilicate samples were treated at high temperature (1200 °C), the formation of mullite was demonstrated for the aluminosilicate aerogel with a molar ratio of Al:Si 3:1, which showed a higher value for SSA compared to the waterglass-based aerogel.

KW - Aerogel

KW - Boehmite

KW - Thermal properties

KW - Waterglass

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SN - 0254-0584

VL - 315

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

M1 - 128912

ER -

Preparation and properties of aluminosilicate aerogels from boehmite and waterglass

Abstract

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Keywords

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