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Improving building energy performance requires the development of new highlyinsulative materials. An affordable retrofitting solution comprising a thinfilm could improve the resistance to heat flow in both residential andcommercial buildings and reduce overall energy consumption. Here we proposecellulose aerogel films formed from pellicles produced by the bacteriaGluconacetobacter hansenii as insulation materials. We studied the impact ofdensity and nanostructure on the aerogels' thermal properties. Thermalconductivity as low as 13 mW/(K*m) was measured for native pellicle-basedaerogels dried as-is with minimal post-treatment. The use of waste from thebeer brewing industry as a solution to grow the pellicle maintained thecellulose yield obtained with standard Hestrin-Schramm medium, making ourproduct more affordable and sustainable. In the future, our work can beextended through further diversification of the sources of substrate among foodwastes, facilitating larger potential production and applications.

Aerogel from sustainably grown bacterial cellulose pellicle as thermally insulative film for building envelope