New polymer paint with microbubbles reflects 96 percent sunlight

<pre>New polymer paint with microbubbles reflects 96 percent sunlight

Conditioning, that is, cooling the air, requires more energy than heating it. Plus, this requires special technical devices, and our globe today already feels the pressure of global warming. It's no wonder that scientists around the world are looking for simple solutions to cool our environment, and researchers from Columbia University (USA) have an excellent option.

They developed a polymer that can reflect and dissipate the maximum amount of solar energy, which cannot using traditional white paint. The thing is microbubbles – in the composition of the coating besides the polymer itself (it is conditionally transparent) there is a solvent and water. The solvent dries first on the wall, causing the water to condense and form tiny bubbles throughout the thickness of the layer. But water, too, soon evaporates and leaves voids, which serves as an anti-trap for sunlight.

Sunlight is complex in structure, but due to the difference in refractive indices between the polymer and the voids in it, the radiation is reflected over almost the entire spectrum of waves. In practice, the reflection level reaches 96%, which is why the warm light of a star named the Sun has practically no effect on objects with this coating. Of course, they will still be heated by contact with air and other warm structures, but they will be colder than surrounding objects. As much as 6 degrees in the dry desert climate of Arizona and 3 degrees cooler in the tropics of Bangladesh, without any energy cost.

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