In DepthMaterials Science

Cool paint job fights solar warmth

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Science  28 Sep 2018:
Vol. 361, Issue 6409, pp. 1303
DOI: 10.1126/science.361.6409.1303

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Homes in Greece and other sunbaked countries are regularly painted white to reflect as much sunlight as possible. Researchers are building on that age-old strategy with a new wave of "passive radiative cooling" materials that shed sunlight and heat. They do so by first reflecting nearly all the light that hits them and also radiating away energy at wavelengths that aren't absorbed by the surrounding air. Most of these materials are not easy to apply to existing roofs and walls, but a team of U.S. researchers has now created a cooling paint that can coat just about any surface, dropping its temperature by 6°C.