Large scalable, ultrathin and self-cleaning cellulose aerogel film for daytime radiative cooling

IF 20.2 Q1 MATERIALS SCIENCE, PAPER & WOOD Journal of Bioresources and Bioproducts Pub Date : 2023-07-13 DOI:10.1016/j.jobab.2023.06.004
Chenyang Cai, Yuanbo Sun, Yi Chen, Zechang Wei, Yibo Wang, Fuling Chen, Wanquan Cai, Jiawen Ji, Yuxin Ji, Yu Fu
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引用次数: 1

Abstract

Passive cooling strategy shows great potential in mitigating global warming and reducing energy consumption. Because of the high emissivity in the atmospheric transparency window (λ ≈ 8–13 µm), cellulose is considered as a good candidate for radiative cooling. However, traditional cellulose coolers generally show poor solar reflection and can be polluted by dust outside, thereby resulting in poor daytime cooling efficiency. To address these drawbacks, we developed sustainable cellulose nanowhiskers (CNWs)/ZnO composite aerogel films with favorable optical performance, mechanical robustness, and self-cleaning function for efficient daytime radiative cooling, which can be achieved via freeze casting and hot-pressing process. Due to formation of multi-level porous structure and chemical bonds (Si-O-C/Si-O-Si), such aerogel film exhibited high solar reflectance (97%) and high infrared emittance (92.5%). It achieved a sub-ambient temperature drop of 6.9 °C under direct sunlight in hot weather. Most importantly, the surface roughness and low surface energy enable cellulose aerogel film hydrophobicity (contact angle = 133°), thereby resulting in an anti-dust function. This work provides insight into the design of sustainable thermal regulating materials to realize carbon neutrality.

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大型可伸缩,超薄和自清洁纤维素气凝胶膜日间辐射冷却
被动冷却策略在缓解全球变暖和降低能源消耗方面显示出巨大潜力。由于大气透明度窗口的高发射率(λ≈8-13µm),纤维素被认为是辐射冷却的良好候选者。然而,传统的纤维素冷却器通常表现出较差的太阳反射,并且可能被外部灰尘污染,从而导致白天的冷却效率较差。为了解决这些缺点,我们开发了可持续的纤维素纳米晶须(CNW)/ZnO复合气凝胶膜,该膜具有良好的光学性能、机械坚固性和自清洁功能,可通过冷冻铸造和热压工艺实现高效的日间辐射冷却。由于形成了多层多孔结构和化学键(Si-O-C/Si-O-Si),这种气凝胶膜具有高的太阳反射率(97%)和高的红外发射率(92.5%)。在炎热的天气下,在阳光直射下,其亚环境温度下降了6.9°C。最重要的是,表面粗糙度和低表面能使纤维素气凝胶膜具有疏水性(接触角 = 133°),从而产生防尘功能。这项工作为实现碳中和的可持续热调节材料的设计提供了见解。
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来源期刊
Journal of Bioresources and Bioproducts
Journal of Bioresources and Bioproducts Agricultural and Biological Sciences-Forestry
CiteScore
39.30
自引率
0.00%
发文量
38
审稿时长
12 weeks
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