A nanoengineered polymer paint-like coating passively cools buildings and captures water directly from the air without energy input. It could help tackle global water scarcity and help cool buildings, reducing the need for energy-intensive systems. The porous polymer coating reflects up to 97% of sunlight and radiates heat into the air, keeping surfaces up to six degrees cooler than the surrounding air even under direct sun. This process creates ideal conditions for atmospheric water vapor to condense into droplets on the cooler surface.
www.sydney.edu.au/news-opinion/news/2025/11/03/cooling-paint-harvests-water-from-thin-air.html