According to foreign media reports, researchers recently discovered that there is a huge potential for using reflective white paint to decorate buildings to keep them cool. A team of materials scientists is reporting major progress in this area. They have produced a new type of ultra-white coating that can reflect up to 98% of solar radiation.
For some time, scientists have been exploring how to widely use white paint to significantly reduce the temperature of buildings and even the surrounding microclimate. For example, a 2012 NASA study found that white paint can reduce the peak temperature of New York City rooftops by an average of 43°F (24°C).
Although researchers continue to explore the possibility of this, some people even use glass to produce reflective coatings, but the best performing white coatings on the market reflect about 85% of solar radiation. The team from UCLA hopes to improve this by making some adjustments to the formula.
The key ingredient of the current cooling white paint is titanium oxide, which can reflect most visible light and near infrared rays very effectively. However, there is a disadvantage that it absorbs both ultraviolet light and violet light, and there is still room for improvement. By exploring alternative materials, the team replaced titanium oxide with cheap and easily available ingredients (such as the artist's pigment barite) and powdered polytetrafluoroethylene (more widely known as Teflon). Scientists have also reduced the number of polymer binders in coatings, which usually have an endothermic effect.
Through these changes to the formulation, the cooling ability of an ultra-white coating has been significantly improved, so that it showed that it can reflect up to 98% of incoming radiation during the test. This material can play a big role in reducing the cooling cost of buildings by reducing the use of air conditioners and other systems. And the team stated that deploying it in real-world scenarios should not require too much work.
UCLA postdoctoral scholar Jyotirmoy Mandal said: "The potential cooling benefits that this can produce may be realized in the near future, because our proposed modifications are within the capabilities of the paint and coatings industry."
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