Passive cooling paint enabled by rational design of thermal-optical and mass transfer properties

• 成果类型: Article
• 署名作者: Fei, Jipeng; Zhang, Xuan; Han, Di; Lei, Yue; Xie, Fei; Zhou, Kai; Koh, See-Wee; Ge, Junyu; Zhou, Hao; Wang, Xingli; Wu, Xinghui; Tan, Jun-Yan; Gu, Yuheng; Long, Yongping; Koh, Zhi Hui; Wang, Su; Du, Panwei; Mi, Tangwei; Ng, Bing-Feng; Cai, Lili; Feng, Chi; Gan, Qiaoqiang; Li, Hong
• 署名单位: Nanyang Technological University; Beijing Institute of Technology; King Abdullah University of Science & Technology; Chinese Academy of Sciences; Changchun Institute of Optics, Fine Mechanics & Physics, CAS; University of Illinois System; University of Illinois Urbana-Champaign; Nanyang Technological University; University of Dundee; Chongqing University; King Abdullah University of Science & Technology
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-9325
• DOI: 10.1126/science.adt3372
• 发表日期: 2025-06-05
• 页码: 1044-1049
• 关键词: raman-spectroscopy; cement hydration; polymers; paste

摘要

Integrating radiative and evaporative cooling shows promise for enhancing passive cooling, but durable self-curing integrated cooling paints remain underdeveloped. We designed a modified cementitious structure with advanced thermal-optical and mass transfer properties, boosting cooling power while ensuring durability, mechanical strength, and broad adhesion. The paint achieves 88 to 92% solar reflectance (depending on wetting), 95% atmospheric window emittance, similar to 30% water retention, and self-replenishing properties, maintaining stable optical performance even when wet. Field tests in tropical Singapore demonstrated superior cooling performance compared with commercial white paints. Pilot-scale demonstrations highlighted consistent electricity savings under varying weather conditions, supported by theoretical modeling. By leveraging sustainable water evaporation and thermal radiation, this paint offers a practical and long-term solution for mitigating the urban heat island effect.