Fast and Minimal‐Solvent Production of Superinsulating Silica Aerogel Granulate

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  • Lukas Huber
    Building Energy Materials and Components Laboratory, Swiss Federal Laboratories for Materials Science and Technology, Empa Überlandstrasse 129 8600 Dübendorf Switzerland
  • Shanyu Zhao
    Building Energy Materials and Components Laboratory, Swiss Federal Laboratories for Materials Science and Technology, Empa Überlandstrasse 129 8600 Dübendorf Switzerland
  • Wim J. Malfait
    Building Energy Materials and Components Laboratory, Swiss Federal Laboratories for Materials Science and Technology, Empa Überlandstrasse 129 8600 Dübendorf Switzerland
  • Sirje Vares
    VTT Technical Research Center of Finland Vuorimiehentie 5 Espoo, P.O. Box 1000 FI-02044 VTT Finland
  • Matthias M. Koebel
    Building Energy Materials and Components Laboratory, Swiss Federal Laboratories for Materials Science and Technology, Empa Überlandstrasse 129 8600 Dübendorf Switzerland

説明

<jats:title>Abstract</jats:title><jats:p>With their low thermal conductivity (<jats:italic>λ</jats:italic>), silica aerogels can reduce carbon emissions from heating and cooling demands, but their widespread adoption is limited by the high production cost. A one‐pot synthesis for silica aerogel granulate is presented that drastically reduces solvent use, production time, and global warming potential. The inclusion of the hydrophobization agent prior to gelation with a post‐gelation activation step, enables a complete production cycle of less than four hours at the lab scale for a solvent use close to the theoretical minimum, and limits the global warming potential. Importantly, the one‐pot aerogel granulate retains the exceptional properties associated with silica aerogel, mostly <jats:italic>λ</jats:italic>=14.4±1.0 mW m<jats:sup>−1</jats:sup>⋅K<jats:sup>−1</jats:sup> for the pilot scale materials, about half that of standing air (26 mW m<jats:sup>−1</jats:sup>⋅K<jats:sup>−1</jats:sup>). The resource‐, time‐, and cost‐effective production will allow silica aerogels to break out of its niche into the mainstream building and industrial insulation markets.</jats:p>

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