Columbia's pigment-free polymer coating keeps surfaces 6°C cooler without electricity

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Researchers at Columbia Engineering have developed a porous polymer coating capable of cooling surfaces below ambient air temperature without any power consumption. Instead of conventional white pigments, the coating uses nano-to-microscale air voids to reflect sunlight and radiate heat into the sky. Field tests conducted in Arizona showed the coated surface remained approximately 6°C cooler than the surrounding air, while trials in Bangladesh recorded a 3°C reduction. The passive cooling technology could offer an energy-free solution for reducing heat in buildings and infrastructure across hot climates.

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