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PolyU unveils cooling ceramic: 99.6% solar reflectivity
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A team of researchers at The Hong Kong Polytechnic University (PolyU), led by Prof. Wang Zuankai, Associate Vice President (Research and Innovation), has unveiled a groundbreaking cooling ceramic material with an unprecedented solar reflectivity of 99.6 percent.
Their pioneering work, featured in the esteemed journal Science, harnesses nature's genius to revolutionize energy-efficient cooling systems.
Collaborating with Prof. Christopher Chao, Vice President (Research and Innovation) and Chair Professor of Thermal and Environmental Engineering at PolyU, Prof. Wang's team joined forces with researchers from the City University of Hong Kong to delve into this transformative project.
The newly developed cooling ceramic draws inspiration from the intricate structures found in the scales of Cyphochilus, renowned as the whitest beetle known to science. Mimicking the bio-inspired hierarchically porous structure observed in this beetle, the ceramic material showcases exceptional light-scattering properties, achieving unparalleled solar reflectivity.
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Prof. Wang underscores the significance of emulating nature's brilliance: "Our work exemplifies the power of learning from nature. By optimizing the scattering system found in the beetle's scales, we've achieved remarkable solar reflectivity in our cooling ceramic."
Energy conversation in indoor environments
This innovation holds immense promise for energy conservation in indoor environments, offering substantial potential for reducing cooling demands. Prof. Wang emphasizes the wealth of inspiration nature offers: "Nature provides us with intricate designs and sustainable solutions honed over millions of years. We uncover innovative ideas that can be translated into practical applications through meticulous study."
Furthermore, this cooling ceramic material serves as a testament to Prof. Wang's pioneering work on Structured Thermal Amour (STA), presenting the potential to facilitate efficient water cooling at ultra-high solid temperatures—an unexplored territory in scientific research.
Previously, Prof. Wang's endeavors successfully addressed challenges posed by the Leidenfrost effect, inhibiting it above 1,000 degrees Celsius (°C) — or 1,832 degrees Fahrenheit (°F) — for sustained thermal cooling.
The Leidenfrost effect occurs when a vapor layer forms between a solid and a liquid at elevated temperatures, hindering effective heat transfer. The team's innovative cooling ceramic efficiently tackles this effect by exhibiting super-hydrophilicity and hierarchical porosity.
These characteristics enable rapid droplet spreading and impregnation, effectively suppressing the Leidenfrost effect at temperatures surpassing 800°C (1,472°F) during evaporative cooling.
This novel exploration into the Leidenfrost effect within passive radiative cooling materials pioneers a new frontier in material design. Beyond its exceptional solar reflectivity, the cooling ceramic boasts multifunctionality, including high weather resistance, mechanical robustness, and self-cleaning properties. It is an ideal candidate for diverse practical applications in construction and beyond.
Prof. Wang envisions this breakthrough not merely as a scientific achievement but as a transformative solution ready for real-world implementation. Under Prof. Wang's guidance, the Research Centre for Nature-Inspired Science and Engineering at PolyU endeavors to harness nature's brilliance in addressing societal and environmental challenges through innovation and collaboration.
This monumental step in developing sustainable cooling solutions showcases the immense potential of bio-inspired materials to revolutionize energy efficiency and pave the way for a greener future.
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