Lu Guo, Du Fengyin, Wang Zhen, Wu Feilong, Zuo Wenqiang, Xu Xiaohang, Wu Zhangyu, Liu Chang, Yang Ruizhe, Tian Yanpei, Hu Zhangli, Zhao Dongliang, Guo Chenyue, Li Tian, She Wei, Miao Changwen
State Key Laboratory of Engineering Materials for Major Infrastructure, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China.
School of Mechanical Engineering, Purdue University, West Lafayette, IN 47906, USA.
Sci Adv. 2025 Aug 22;11(34):eadv2820. doi: 10.1126/sciadv.adv2820. Epub 2025 Aug 20.
Structural materials with the capability for passive daytime radiative cooling (PDRC) show promise for the sustainable cooling of buildings. However, developing durable PDRC structural materials with optical robustness, ease of deployment, and scalability remain a challenge for civil engineering applications. We synthesized a metasurface-enhanced cooling cement using a universal, scalable pressure-driven fabrication strategy during a low-carbon production process. The self-assembly of multiple-sized reflective ettringites as main hydration products toward the metasurface, coupled with hierarchical pores, guaranteed high solar reflectance (96.2%), whereas raw materials containing alumina- and sulfur-rich function groups leveraged inherent mid-infrared emissivity (96.0%). This photonic-architectured cement achieved a temperature drop of 5.4°C during midday conditions with a solar intensity of 850 watts per square meter. This supercool cement featured intrinsic high strength, armored abrasive resistance, and optical stability, even when exposed to harsh conditions, such as corrosive liquids, ultraviolet radiation, and freeze-thaw cycles. A machine learning-guided life-cycle assessment indicated its potential to achieve a net-negative carbon emission profile.
具有被动式日间辐射冷却（PDRC）能力的结构材料有望实现建筑物的可持续冷却。然而，开发具有光学稳健性、易于部署和可扩展性的耐用PDRC结构材料对于土木工程应用来说仍然是一项挑战。我们在低碳生产过程中，采用通用、可扩展的压力驱动制造策略合成了一种超表面增强冷却水泥。多种尺寸的反射钙矾石作为主要水化产物自组装形成超表面，再加上分层孔隙，确保了高太阳反射率（96.2%），而含有富含氧化铝和硫的官能团的原材料则利用了其固有的中红外发射率（96.0%）。这种光子结构水泥在太阳强度为每平方米850瓦的午间条件下实现了5.4°C的温度下降。这种超冷却水泥具有固有的高强度、抗磨性和光学稳定性，即使暴露在腐蚀性液体、紫外线辐射和冻融循环等恶劣条件下也是如此。机器学习引导的生命周期评估表明，它有可能实现净负碳排放。
