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<p>Aerogel fiber textiles exhibit high thermal insulation performance. However, the lack of elasticity limits their application in personal protective equipment. Herein, we report a novel elastic hollow poly(vinylidene fluoride) (PVDF) aerogel fiber (EHPAF) that is fabricated via multi-step sol-gel engineering. EHPAF remains high elasticity with a reversible compression strain of 80%, as well as high flexibility and hydrophobicity under extreme temperatures (− 196–300&#xa0;°C). The EHPAF textile with a low thermal conductivity of 0.026&#xa0;W·m<sup>− 1</sup>·K<sup>− 1</sup> and a thickness of 1&#xa0;mm demonstrates outstanding all-weather thermoregulation, achieving thermal insulation temperature difference of 11.8–16.9&#xa0;°C at − 30–60&#xa0;°C. Moreover, EHPAF textile exhibits high solar reflectance of 92.2% and mid-infrared emissivity of 98.6%, resulting in an ultrahigh cooling power of 109&#xa0;W·m<sup>− 2</sup> and achieving a temperature reduction of 5.5&#xa0;°C under a solar irradiance of 800&#xa0;W·m<sup>− 2</sup>. This work provides a strategy for developing multifunctional aerogel fibers that integrate thermal insulation and outdoor radiative cooling for efficient thermal management of the human bodies, buildings, and outdoor facilities.</p>

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Elastic hollow PVDF aerogel fibers for efficient thermal insulation and radiation cooling

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月6日

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  • Yong Kong,
  • Xiaolei Dai,
  • Zhengbo Lai,
  • Fuhao Xu,
  • Xiaodong Shen

摘要

Aerogel fiber textiles exhibit high thermal insulation performance. However, the lack of elasticity limits their application in personal protective equipment. Herein, we report a novel elastic hollow poly(vinylidene fluoride) (PVDF) aerogel fiber (EHPAF) that is fabricated via multi-step sol-gel engineering. EHPAF remains high elasticity with a reversible compression strain of 80%, as well as high flexibility and hydrophobicity under extreme temperatures (− 196–300 °C). The EHPAF textile with a low thermal conductivity of 0.026 W·m− 1·K− 1 and a thickness of 1 mm demonstrates outstanding all-weather thermoregulation, achieving thermal insulation temperature difference of 11.8–16.9 °C at − 30–60 °C. Moreover, EHPAF textile exhibits high solar reflectance of 92.2% and mid-infrared emissivity of 98.6%, resulting in an ultrahigh cooling power of 109 W·m− 2 and achieving a temperature reduction of 5.5 °C under a solar irradiance of 800 W·m− 2. This work provides a strategy for developing multifunctional aerogel fibers that integrate thermal insulation and outdoor radiative cooling for efficient thermal management of the human bodies, buildings, and outdoor facilities.