Yang Huiyu, Chen Rong, Cheng Xiaohua, Zhao Liangang, Liu Hai, Deng Bo, Xu Zushun, Gong Chunli
School of Chemistry and Materials Science, Hubei Engineering University, Xiaogan 43200, China; Key Laboratory for New Textile Materials and Applications of Hubei Province, Wuhan Textile University, Wuhan 430200, China.
School of Chemistry and Materials Science, Hubei Engineering University, Xiaogan 43200, China; Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Key Laboratory of Polymer Materials, School of Materials Science and Engineering, Hubei University, Wuhan 430062, China.
Int J Biol Macromol. 2025 Apr;300:140298. doi: 10.1016/j.ijbiomac.2025.140298. Epub 2025 Jan 23.
Passive Radiant Cooling and Heating are green and sustainable methods of radiant heat management without consuming additional energy. However, the absorption of sunlight and poor insulation of materials can reduce radiative cooling and also affect radiative heating performance. Herein, we have constructed porous hierarchical dual-mode silk nanofibrous aerogel (SNF) films with high mechanical toughness and stability using silk nanofibers/GO. The porous hierarchical structure endows the cooling side of the dual-mode film with low thermal conductivity (0.034 W·m·K) and high atmospheric window emissivity (92.7 %), with a sub-ambient cooling temperature of up to 9.6 °C under direct sunlight. The heating side of the dual-mode film has a high solar absorptivity (93.8 %) and a low atmospheric window emissivity (11.4 %). The covered air temperature was warmed by 25.5 °C in the simulated cold environment by the ice water bath. Importantly, both sides of the film are hydrophobically modified with FOTS to exhibit self-cleaning properties that protect the surface from contamination and facilitate long-term radiative cooling/heating. The films showed excellent cooling and heating properties even after two months of immersion in different pH solutions. This dual-mode aerogel film has great potential for outdoor applications and can be adapted to radiant heat management in various complex environments.
被动辐射制冷和加热是绿色且可持续的辐射热管理方法，无需消耗额外能源。然而，阳光吸收和材料隔热性差会降低辐射制冷效果，还会影响辐射加热性能。在此，我们使用丝纳米纤维/氧化石墨烯构建了具有高机械韧性和稳定性的多孔分级双模式丝纳米纤维气凝胶（SNF）薄膜。这种多孔分级结构赋予双模式薄膜的制冷面低导热率（0.034W·m·K）和高大气窗口发射率（92.7%），在直射阳光下亚环境冷却温度高达9.6°C。双模式薄膜的加热面具有高太阳吸收率（93.8%）和低大气窗口发射率（11.4%）。在模拟寒冷环境中，通过冰水浴，覆盖的空气温度升高了25.5°C。重要的是，薄膜的两面都用全氟辛基三乙氧基硅烷进行了疏水改性，以展现自清洁特性，保护表面免受污染，并有助于长期辐射制冷/加热。即使在不同pH溶液中浸泡两个月后，这些薄膜仍表现出优异的制冷和加热性能。这种双模式气凝胶薄膜在户外应用方面具有巨大潜力，可适应各种复杂环境中的辐射热管理。
