Researchers created a white paint able to keep surfaces up to 18ºF (10ºC) cooler than ambient

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Engineers at Purdue University have created a that is said to be able to keep surfaces up to 18ºF (10ºC) cooler than ambient. The researchers considered over 100 different material combinations and tested about 50 different formulations for each material. Finally, the choosen material is based on calcium carbonate. Calcium carbonate fillers absorb almost no UV rays due to a so-called large “band gap,” a result of their atomic structure. They also have a high concentration of particles that are different sizes, allowing the paint to scatter a wider range of wavelengths. The paint would absorb nearly no and send heat away from the building, replacing the need for air conditioning, according to the researchers. The paint would not only send heat away from a surface, but also away from Earth into deep space where heat travels indefinitely at the speed of light.

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The researchers are working on developing other paint colors that could have cooling benefits. The team filed an international patent application on this paint formulation through the Purdue Research Foundation Office of Technology Commercialisation. The Cooling Technologies Research Center at Purdue University and the Air Force Office of Scientific Research through the Defense University Research Instrumentation Program funded the work.