Columbia engineers develop pigment-free coating that kept surfaces 6°C cooler under Arizona sun
Columbia Engineering researchers developed a porous polymer coating that can cool surfaces below the surrounding air temperature without using electricity.
The coating replaces conventional white pigments with nano-to-microscale air voids that reflect sunlight and release heat towards the sky.
Tests showed the surface stayed about 6°C below ambient temperature in Arizona and 3°C below it in Bangladesh.
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