Cambridge researchers made cellulose acetate films that absorbed less than 5% of sunlight; coated surfaces stayed about 5°C below the surrounding air without power

Innovative researchers have created a revolutionary cellulose acetate film that excels in passive cooling. By absorbing minimal sunlight while efficiently emitting infrared heat, surfaces coated with this film remain cooler than the ambient air without needing electricity. Practical uses for this technology abound, including applications in roofing, vehicles, and storage facilities. This advancement promises to alleviate pressure on electricity grids during sweltering conditions.