A material made from two forms of cellulose, which is found in wood, reflects heat and can be made in a variety of colours
A colourful material made from wood cools down even when under direct sunlight, meaning it could be used to decorate the outside of buildings while lowering their internal temperature without the need for air conditioning.
Most materials warm up when exposed to sunlight because they absorb a combination of ultraviolet, visible and infrared light, but some have a cooling effect because they reflect these wavelengths instead and on top of that also radiate away some of the warmth within the material through the atmosphere into space as infrared.Silvia Vignolini
at the University of Cambridge and her colleagues have now found a way to make versions in red, green or blue that retain a cooling effect – and the key ingredient comes from wood, in the form of two types of cellulose.
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