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National News

The Times of India

National / The Times of India

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New pigment-free coating stays 6C cooler than surrounding air in desert 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 6C below ambient temperature in Arizona and 3C below it in Bangladesh.

26 Aug 2026 2:00 pm