Wang Tong, Wu Xinyu, Zhu Qian, Chen Yinggang, Zhang Shuqi, Gu Min, Zhang Yinan
Institute of Photonic Chips, University of Shanghai for Science and Technology, Shanghai 200093, China.
Centre for Artificial-Intelligence Nanophotonics, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.
Nanophotonics. 2023 Nov 10;13(5):601-609. doi: 10.1515/nanoph-2023-0596. eCollection 2024 Mar.
Radiative cooling technology with zero-energy consumption and zero-carbon emission has drawn enormous attention. However, the high-cost manufacture, limited scalability, and narrow application scopes remain major impediments to radiative cooling commercialization. Here, we present a bilayer PDMS/nanoPE fabricated by an automatic film applicator for high-performance passive daytime radiative cooling. The nanoPE underlayer maximizes the reflection of sunlight and the transparent PDMS top-layer dramatically enhances the infrared emissivity of pristine nanoPE across the atmospheric transparency window (∆ = 0.85). The obtained PDMS/nanoPE simultaneously allows a high solar reflectance of 0.94 and a thermal emittance of 0.94, enabling a sub-ambient cooling of 4.5 °C with a maximum of 7.6 °C in rooftop test and a theoretical net cooling power of 65 W/m. A distinct temperature reduction of more than 10 °C can be achieved in comparison with pristine PDMS film. Integration of the hydrophobicity, durability, robust mechanical strength, and industrial scalability, we believe this work will provide practical and efficient solutions to cooling vehicles, buildings, and the human body in a simple and low-cost manner.
零能耗、零碳排放的辐射冷却技术已引起广泛关注。然而，高制造成本、有限的可扩展性和狭窄的应用范围仍然是辐射冷却商业化的主要障碍。在此，我们展示了一种通过自动涂膜器制备的双层聚二甲基硅氧烷/纳米聚乙烯（PDMS/nanoPE），用于高性能被动日间辐射冷却。纳米聚乙烯底层可使太阳光反射最大化，而透明的聚二甲基硅氧烷顶层显著提高了原始纳米聚乙烯在大气透明窗口（Δ = 0.85）的红外发射率。所制备的聚二甲基硅氧烷/纳米聚乙烯同时具有0.94的高太阳反射率和0.94的热发射率，在屋顶测试中实现了4.5℃的亚环境冷却，最高可达7.6℃，理论净冷却功率为65W/m²。与原始聚二甲基硅氧烷薄膜相比，温度可明显降低超过10℃。结合疏水性、耐久性、强大的机械强度和工业可扩展性，我们相信这项工作将以简单且低成本的方式为车辆、建筑物和人体冷却提供切实有效的解决方案。
