Yang Xiaowei, Yan Defeng, Lu Yi, Shang Yulin, Sun Jing, Song Jinlong
State Key Laboratory of High-performance Precision Manufacturing, Dalian University of Technology, Dalian 116024, China.
Key Laboratory for Micro/Nano Technology and System of Liaoning Province, Dalian University of Technology, Dalian 116024, China.
Materials (Basel). 2023 Jul 25;16(15):5232. doi: 10.3390/ma16155232.
Passive-cooling building materials can achieve cooling without external energy consumption, which is an energy-saving and environmentally friendly cooling method. However, the existing passive-cooling building materials have the limitations of high cost, complicated processes, and a toxic organic solvent, which hinders the passive-cooling technology applied in practical building. To overcome these limitations, we developed a facile, high-efficiency, non-toxic, and superhydrophobic passive-cooling building coating (SPCBC) with an efficient cooling capability and excellent durability that was composed of polydimethylsiloxane and SiO. The fabricated SPCBC demonstrated a high reflectance and a high emittance, showing a superior cooling capability with a 14 °C temperature drop compared with a bare cement surface on a hot summer day. In addition, the SPCBC could not be wetted or contaminated by muddy water, corrosive aqueous solutions, or dust, which presented an excellent anti-fouling and self-cleaning capability. Moreover, the fabricated SPCBC could work outdoors for 30 days, withstand UV irradiation for 30 days, and resist accelerated aging for 100 h without any significant changes in the superhydrophobicity and the cooling capability, meaning that the SPCBC had an outstanding durability. This work provides a new method to facilitate passive-cooling technology to apply in practical building in hot weather regions of the world.
被动冷却建筑材料无需外部能源消耗即可实现降温，这是一种节能环保的冷却方式。然而，现有的被动冷却建筑材料存在成本高、工艺复杂以及使用有毒有机溶剂等局限性，这阻碍了被动冷却技术在实际建筑中的应用。为克服这些局限性，我们开发了一种简便、高效、无毒且超疏水的被动冷却建筑涂料（SPCBC），它由聚二甲基硅氧烷和SiO组成，具有高效的冷却能力和出色的耐久性。所制备的SPCBC具有高反射率和高发射率，在炎热的夏日与裸露的水泥表面相比，降温能力卓越，温度可降低14°C。此外，SPCBC不会被泥水、腐蚀性水溶液或灰尘润湿或污染，具有出色的防污和自清洁能力。而且，所制备的SPCBC可在户外工作30天，耐受紫外线照射30天，抗加速老化100小时，超疏水性和冷却能力均无任何显著变化，这意味着SPCBC具有出色的耐久性。这项工作为促进被动冷却技术在世界炎热气候地区的实际建筑中应用提供了一种新方法。
