Strong, Thermally Superinsulating Biopolymer-Silica Aerogel Hybrids by Cogelation of Silicic Acid with Pectin

Abstract : Silica aerogels are excellent thermal insulators, but their brittle nature has prevented widespread application. To overcome these mechanical limitations, silica–biopolymer hybrids are a promising alternative. A one-pot process to monolithic, superinsulating pectin–silica hybrid aerogels is presented. Their structural and physical properties can be tuned by adjusting the gelation pH and pectin concentration. Hybrid aerogels made at pH 1.5 exhibit minimal dust release and vastly improved mechanical properties while remaining excellent thermal insulators. The change in the mechanical properties is directly linked to the observed “neck-free” nanoscale network structure with thicker struts. Such a design is superior to “neck-limited”, classical inorganic aerogels. This new class of materials opens up new perspectives for novel silica–biopolymer nanocomposite aerogels.
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Contributeur : Magalie Prudon <>
Soumis le : mercredi 14 octobre 2015 - 15:11:28
Dernière modification le : lundi 12 novembre 2018 - 11:04:28

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Shanyu Zhao, Wim J. Malfait, Arnaud Demilecamps, Yucheng Zhang, Samuel Brunner, et al.. Strong, Thermally Superinsulating Biopolymer-Silica Aerogel Hybrids by Cogelation of Silicic Acid with Pectin. Angewandte Chemie, Wiley-VCH Verlag, 2015, 127 (48), pp.14490-14494 ⟨10.1002/ange.201507328⟩. ⟨hal-01215590⟩

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