%0 Journal Article
%A Ocejo, Marta
%A Goiti, Eunate
%A Salinas-Garzón, Juan
%A Ibáñez-Gómez, José Antonio
%T Preparation and properties of aluminosilicate aerogels from boehmite and waterglass
%D 2024
%@ 0254-0584
%U https://hdl.handle.net/11556/3412
%X 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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