Hierarchically structured superhydropobic polydimethylsiloxane composite film for daytime radiative cooling

IF 3.5 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Science Pub Date : 2025-05-08 DOI:10.1007/s10853-025-10794-w

Bowei Xu, Taijiang Li, Qi Sun, Zhengji Lou, Shengguang Chen, Wei Li

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引用次数: 0

Abstract

Radiative cooling without energy consumption is an ideal green alternative for air conditioning. Herein, we fabricate a hierarchically structured superhydrophobic composite film of polydimethylsiloxane, hollow glass beads and silica aerogels (S-PDMS/HGB/SSA) which integrates strong sunlight reflectance (95.3%), high thermal infrared emittance (96.9%) and robust superhydrophobicity (160.9°). The effective synergy of the high solar reflection and thermal infrared emission allows the coating to achieve a sub-ambient temperature drop of 7.4 °C under strong sunlight. The superhydrophobicity keeps the composite film away from contamination by self-cleaning, maintaining well the radiative cooling performance for long-term outdoor application. Additionally, the as prepared film demonstrates excellent chemical durability after exposure to different pH solutions and UV light irradiation. This work provides a new strategy to integrate self-cleaning with radiative cooling, showing great potential to advance energy-free cooling materials toward real-world applications.

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日间辐射冷却用分层结构超疏水聚二甲基硅氧烷复合薄膜

无能耗的辐射制冷是一种理想的绿色空调替代方案。本文制备了一种由聚二甲基硅氧烷、中空玻璃微珠和二氧化硅气凝胶组成的分层结构的超疏水复合薄膜（S-PDMS/HGB/SSA），该薄膜集强太阳光反射率（95.3%）、高热红外发射率（96.9%）和强超疏水性（160.9°）于一体。高太阳反射和热红外发射的有效协同作用使涂层在强阳光下实现了7.4°C的亚环境温度下降。超疏水性使复合膜通过自清洁远离污染，长期在室外应用时保持良好的辐射冷却性能。此外，所制备的薄膜在不同pH溶液和紫外线照射下表现出优异的化学耐久性。这项工作提供了一种将自清洁与辐射冷却相结合的新策略，显示出将无能量冷却材料推向实际应用的巨大潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Materials Science 工程技术-材料科学：综合

CiteScore

7.90

自引率

4.40%

发文量

1297

审稿时长

2.4 months

期刊介绍： The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.