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Published on: November 6, 2018
Achieving Robust Ultraviolet Resistance in Scalable Radiative Cooling Coatings for Sustainable Outdoor Building
Borong Zhu1,2, Xueping Sun1, Xuguang Luo2
1National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, Colleges of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China.
A novel radiative cooling coating offers a zero-energy solution for urban heat islands. This scalable, durable coating significantly reduces building temperatures and improves UV resistance, paving the way for widespread adoption.
Area of Science:
- Materials Science
- Nanotechnology
- Sustainable Energy
Background:
- Urban heat islands and rising cooling energy demands necessitate advanced solutions.
- Passive radiative cooling (PRC) offers a zero-energy cooling method but faces challenges in efficiency, scalability, and durability.
- Existing PRC technologies often struggle with long-term performance under environmental stressors like UV radiation.
Purpose of the Study:
- To develop a scalable, durable, and high-performance passive radiative cooling coating.
- To address the limitations of current PRC technologies, including manufacturing complexity and UV degradation.
- To demonstrate the effectiveness of the developed coating in reducing surface temperatures under real-world conditions.
Main Methods:
- Fabrication of a radiative cooling coating using core-shell ZnO@SiO2 nanoparticles within a polyvinylidene fluoride-hexafluoropropylene matrix.
- Application of the coating via a cost-effective spraying method for large-area coverage.
- Evaluation of spectral properties (solar reflectance and infrared emissivity) and temperature reduction performance under outdoor conditions.
- Assessment of UV durability through prolonged solar irradiation exposure.
Main Results:
- The developed coating achieved high solar reflectance (96.6%) and infrared emissivity (97.2%).
- Demonstrated a significant surface temperature reduction of up to 14.1 °C, outperforming commercial coatings by 43.6%.
- Exhibited excellent UV resilience, with only a 1.9% decrease in solar reflectance after 100 days of outdoor exposure.
Conclusions:
- The developed ZnO@SiO2-based radiative cooling coating offers a scalable, durable, and high-performance solution for passive cooling.
- This technology effectively combats urban heat islands by reducing building temperatures with zero energy input.
- The coating's robust UV durability and cost-effective application method support its potential for widespread commercial adoption.
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