Aerogels of nanocellulose is an extremely leightweight  type of material. The photo shows an aerogel on a part of a flower.

Nanocellulose aerogels for future biomedical applications

Nanocellulose aerogels are a relatively new type of lightweight material where around 99% of the material consists of air. Research has shown the potential for nanocellulose arogels, among other things, for high-performance insulation and purification of water, but the process of making them has required special equipment such as shock freezing with liquid nitrogen followed […]

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