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Structural Porous Ceramic for Efficient Daytime Subambient Radiative Cooling
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-09-26 , DOI: 10.1021/acsami.3c10772 Jieyan Zhao 1, 2 , Qing Meng 1 , Yong Li 1 , Zengchao Yang 1 , Jiangtao Li 1, 2
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-09-26 , DOI: 10.1021/acsami.3c10772 Jieyan Zhao 1, 2 , Qing Meng 1 , Yong Li 1 , Zengchao Yang 1 , Jiangtao Li 1, 2
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Radiative cooling enables the passive cooling of buildings without energy input. Structural radiative cooling materials, such as cellulose-based composites, have recently received extensive attention due to their exceptional mechanical properties and spectral selectivity. However, the cellulose-based materials face challenges in durability and flame resistance, which limits their practical application. Herein, a structural porous Si3N4–BN ceramic with a high solar reflectivity of ∼0.95 and an atmospheric window emissivity of ∼0.95 was prepared by one-step combustion synthesis. The porous ceramic achieves a subambient radiative cooling performance of 5.14 °C under direct sunlight and theoretically yields a cooling power of 78.55 W m–2. The network structure of Si3N4 crystals leads to a flexural strength of 31.07 MPa and a compressive strength of 65.36 MPa. The porous Si3N4–BN ceramics with excellent radiative cooling performance, mechanical properties, and thermal insulation exhibit wide application prospects in building cooling, especially in the harsh environment of tropical desert and island regions.
中文翻译：
用于高效日间低温辐射冷却的结构多孔陶瓷
辐射冷却无需能量输入即可实现建筑物的被动冷却。结构辐射冷却材料，例如纤维素基复合材料，由于其优异的机械性能和光谱选择性，最近受到了广泛的关注。然而，纤维素基材料在耐久性和阻燃性方面面临挑战，这限制了它们的实际应用。在此，通过一步燃烧合成制备了一种结构多孔Si 3 N 4 –BN陶瓷，其具有~0.95的高太阳反射率和~0.95的大气窗口发射率。多孔陶瓷在阳光直射下可实现 5.14 °C 的低温辐射冷却性能，理论上可产生 78.55 W m –2的冷却功率。Si 3 N 4晶体的网络结构导致弯曲强度为31.07 MPa，压缩强度为65.36 MPa。多孔Si 3 N 4 –BN陶瓷具有优异的辐射冷却性能、力学性能和隔热性能，在建筑冷却尤其是热带沙漠和海岛地区的恶劣环境中表现出广泛的应用前景。
更新日期：2023-09-26
中文翻译：
用于高效日间低温辐射冷却的结构多孔陶瓷
辐射冷却无需能量输入即可实现建筑物的被动冷却。结构辐射冷却材料，例如纤维素基复合材料，由于其优异的机械性能和光谱选择性，最近受到了广泛的关注。然而，纤维素基材料在耐久性和阻燃性方面面临挑战，这限制了它们的实际应用。在此，通过一步燃烧合成制备了一种结构多孔Si 3 N 4 –BN陶瓷，其具有~0.95的高太阳反射率和~0.95的大气窗口发射率。多孔陶瓷在阳光直射下可实现 5.14 °C 的低温辐射冷却性能，理论上可产生 78.55 W m –2的冷却功率。Si 3 N 4晶体的网络结构导致弯曲强度为31.07 MPa，压缩强度为65.36 MPa。多孔Si 3 N 4 –BN陶瓷具有优异的辐射冷却性能、力学性能和隔热性能，在建筑冷却尤其是热带沙漠和海岛地区的恶劣环境中表现出广泛的应用前景。
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