Solvent-free fabrication of flexible and mechanically durable superhydrophobic polydimethylsiloxane-based film for sustainable daytime radiative cooling

IF 4.2 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Optical Materials Pub Date : 2025-03-01 Epub Date: 2025-02-08 DOI:10.1016/j.optmat.2025.116773

Rong-Rong Gao , Chao-Hua Xue , Xiao-Jing Guo , Hui-Di Wang , Meng-Chen Huang , Chao-Qun Ma , Bing-Ying Liu , Shi-Qiang Lyu , Wen-Min Zhang , Fu-Quan Deng , Jun Cheng , Jing Li , Hong-Wei Wang

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Abstract

Passive daytime radiative cooling (PDRC) presents new opportunities for sustainable carbon neutrality as a zero-energy, ecologically friendly cooling strategy. However, most PDRC materials were fabricated using solvents which endanger human health and environment. In this work, a solvent-free method was proposed to fabricate superhydrophobic porous PDRC film by simply curing mixture of polydimethylsiloxane (PDMS), SiO₂ nanoparticles and NaCl into PDMS/SiO₂/NaCl film, followed by desalting and roughening the surface of the film. The as-obtained PDMS/SiO₂/NaCl film possesses a high solar reflectance of 98.2 % and a strong mid-infrared emissivity of 97.7 %, achieving cooling effect with an average temperature drop of 12.8 °C under direct sunlight. Moreover, the film is superhydrophobic with water contact angle of 158.3° and sliding angle of 4.7°, showing typical self-cleaning property. Importantly, the superhydrophobicity and optical properties changed little after UV irradiation, sandpaper abrasion, and stain-cleaning, which guarantee sustainable cooling performance for outdoor applications. The method is simple and does not involve any solvent, providing a green way for radiative cooling materials.

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柔性和机械耐用的超疏水聚二甲基硅氧烷基薄膜的无溶剂制造，用于可持续的日间辐射冷却

被动日间辐射冷却（PDRC）作为一种零能耗、生态友好型的冷却策略，为可持续碳中和提供了新的机会。然而，大多数PDRC材料是用溶剂制备的，对人体健康和环境有害。本文提出了一种无溶剂制备超疏水多孔PDRC膜的方法，即将聚二甲基硅氧烷（PDMS）、SiO2纳米粒子和NaCl的混合物简单固化成PDMS/SiO2/NaCl膜，然后对膜表面进行脱盐和粗化。所制得的PDMS/SiO2/NaCl薄膜具有98.2%的高太阳反射率和97.7%的强中红外发射率，在阳光直射下平均降温12.8℃。膜具有超疏水性，水接触角为158.3°，滑动角为4.7°，具有典型的自清洁性能。重要的是，在紫外线照射、砂纸磨损和污渍清洗后，超疏水性和光学性能几乎没有变化，这保证了室外应用的可持续冷却性能。该方法简单，不涉及任何溶剂，为辐射冷却材料提供了绿色途径。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.