Wood foam for building insulation

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In view of longer and longer hot spells, a German-Chinese research team is working on a new type of insulating foam based on wood, which is intended to reduce the heating up of buildings in summer. This airgel made of cellulose nanocrystals is said to have a cooling effect in other ways in addition to thermal insulation. According to heise online, the foam should be able to reflect up to 96% of the visible light spectrum and emit 92% of the infrared radiation that penetrates it.

In order to dynamically control these properties, the foam should be compressed to different degrees during use. However, large-scale practical tests are still missing.

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