Lightweight hBN Nanoporous Paint with Excellent Cooling Abilities CellRepPhysSci
By Hussain AhmedOct 10 2022Reviewed by Megan Craig, M.Sc. Many weight-sensitive applications such as vehicles, electronics, and aircraft need a thin and lightweight radiative cooling paint made of nanoporous materials. However, achieving high solar reflectance in nanoporous paints with thin layers is a major challenge.
Radiative cooling is a passive type of cooling that reflects direct sunlight, releases radiant heat into deep space via an air-transparent window, and eliminates the need for power production to lower carbon emissions. Non-paintable technologies have also been used in certain applications to achieve radiative cooling. Aside from specific radiative cooling effects, sintered-reflecting ceramic films composed of aluminum oxide, hBN, and other nanoparticles have been employed for aerospace applications, achieving a spectral reflectance of 87.5%.
Although nanoporous paint methods have demonstrated good performance and convenience, they need 300 micrometer thickness to achieve 96% solar reflectivity in basic nanoporous polymer films and 400 micrometer thickness to get the maximum recorded solar reflectivity of 98.1% in barium sulfate paint. Highlights and Key Developments of the Current Study In this study, the researchers created a thin and lightweight hBN nanoporous paint with strong solar reflectivity, sky window emission spectra, and complete daytime sub-ambient cooling. At low coating thickness, the radiative cooling performance of the as-prepared hBN nanoporous paint was experimentally verified.
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