A team from LifeAtPurdue is using nanotechnology to create paints that reflect 98% of sunlight.
The concept of using white paint to deflect heat isn’t new. As far back as the 1970s, scientists and manufacturers had been developing whiter and whiter paints to help reflect sunlight and keep buildings and other surfaces cool. However, the whitest paints available on the market today reflect 90% of light—a number that sounds high but means they still absorb 10% of sunlight and so cannot cool a surface below the ambient temperature.
The barium sulfate paint, while extremely reflective, requires a coat at least 0.4 millimeters thick to be effective—a nonstarter in industries that seek to make their products as light as possible. The paint was also not very viscous: The barium sulfate paint was formulated as a gel for maximum effectiveness, which makes it difficult to apply to surfaces that are not buildings or structures.
“The simulations show that it’s not only the properties of boron nitride, which are different from barium sulfate, but also the shape that really helps on achieving that higher reflectivity we have now,” Katsamba said.Even after settling on a compound that models showed would be great at reflecting sunlight, making the paint itself was still a challenge—especially given that boron nitride’s morphology made some of the paints thicker and less viscous.
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