Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 48, Pages 14282-14286Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201507328
Keywords
hybrid aerogels; NMR spectroscopy; polysaccharides; transmission electron microscopy
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Funding
- European Commission under the Seventh Framework Program [260141]
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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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