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<p>Daytime radiative sky cooling (DRSC) is an emerging sustainable technology that enables emission-free heat management. Incorporating radiative cooling materials into building envelopes has the potential to reduce reliance on electrical cooling. Despite the process, developing radiative cooling materials that are both high-performing, cost-effective, and biodegradable continues to pose a challenge. In this work, a natural mineral (wollastonite) was strategically incorporated into a porous cellulose acetate (CA) film through a simple and effective electrospinning technique combined with non-solvent induced phase separation. The porous structure possessed substantial roughness of the fibers, which provides more scattering sites. Benefit from porous structure and the wollastonite-derived SiO<sub>2</sub> particles, the porous CA/wollastonite-based-SiO<sub>2</sub> film (CWSF) shows an ultra-high solar reflectivity of 98.6% and an infrared emittance of 90.1%, endowing it with outstanding radiative cooling performance. During the outdoor experiment, the CWSF achieved a 7.3&#xa0;℃ below ambient temperature drop at the solar irradiance of 823.6&#xa0;W&#xa0;m<sup>−2</sup>. In addition, the film was modified by simple vapour phase deposition to obtain hydrophobic properties, thereby supporting its durability for long-term outdoor use. In addition, the simulation results indicated that the film on building envelopes (side walls and roof) potentially show its good energy efficiency and sustainable performance compared to baseline building consumption. This energy-free cooling material with simple preparation process and exceptional performance provide a viable pathway to design high-performance cooling structural materials and sustainable building radiative cooling materials for large-scale applications.</p> Graphical Abstract <p></p>

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Preparation of wollastonite derivative/cellulose acetate composite film with nano-porous structure for efficient radiative cooling

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Chen Deng,
  • Zhuoqun Wang,
  • Bencheng Zhao,
  • Zicheng Hu,
  • Tao Zhang,
  • Fengxian Qiu

摘要

Daytime radiative sky cooling (DRSC) is an emerging sustainable technology that enables emission-free heat management. Incorporating radiative cooling materials into building envelopes has the potential to reduce reliance on electrical cooling. Despite the process, developing radiative cooling materials that are both high-performing, cost-effective, and biodegradable continues to pose a challenge. In this work, a natural mineral (wollastonite) was strategically incorporated into a porous cellulose acetate (CA) film through a simple and effective electrospinning technique combined with non-solvent induced phase separation. The porous structure possessed substantial roughness of the fibers, which provides more scattering sites. Benefit from porous structure and the wollastonite-derived SiO2 particles, the porous CA/wollastonite-based-SiO2 film (CWSF) shows an ultra-high solar reflectivity of 98.6% and an infrared emittance of 90.1%, endowing it with outstanding radiative cooling performance. During the outdoor experiment, the CWSF achieved a 7.3 ℃ below ambient temperature drop at the solar irradiance of 823.6 W m−2. In addition, the film was modified by simple vapour phase deposition to obtain hydrophobic properties, thereby supporting its durability for long-term outdoor use. In addition, the simulation results indicated that the film on building envelopes (side walls and roof) potentially show its good energy efficiency and sustainable performance compared to baseline building consumption. This energy-free cooling material with simple preparation process and exceptional performance provide a viable pathway to design high-performance cooling structural materials and sustainable building radiative cooling materials for large-scale applications.

Graphical Abstract