A coat of paint can passively cool down buildings in increasingly hot cities.
, a professor of mechanical engineering at Purdue University, builds on research creating the ultimate cooling ultra-white paint his lab first conceived last year. Now, they have found a formulation that reflects light and cools surfaces below the ambient air temperature better than any other type of white paint available on the market.a material so dark that it absorbs over 99.9 percent of visible light. The ultra-white paint reflects up to 98.
Their previous iteration of white paint used calcium carbonate, a widely available mineral that makes up seashells and limestone. This time, they used barium sulfate, a compound used in x-ray imaging and plastic production. The scientists not only changed the material to make their ultra-white paint but increased the concentration and varied the particle sizes of the barium sulfate.
“We found that a single particle size wouldn’t do a good job because it turns out that each particle size can only reflect one wavelength,” Ruan says. Sunlight, so having various particle sizes in the paint makes a big difference. All of this created a highly reflective white paint that can act as a passive air conditioner. The paint actually lost more heat than it gained. That essentially means “without using any electricity the surface can be cooled below the ambient temperature under the sun,” Ruan says.
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