Dual‐Mode Film Based on Highly Scattering Nanofibers and Upcycled Chips‐Bags for Year‐Round Thermal Management

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Song, Qimeng ; Rettinger, Stefan ; Xu, Chengzhang ; Mansfeld, Ulrich ; Retsch, Markus:
Dual‐Mode Film Based on Highly Scattering Nanofibers and Upcycled Chips‐Bags for Year‐Round Thermal Management.
In: Advanced Functional Materials. (2025) . - 2425458.
ISSN 1616-301X
DOI der Verlagsversion: https://doi.org/10.1002/adfm.202425458

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Abstract

Advanced thermal management is crucial in mitigating the escalating global energy consumption and alleviating associated climatic and environmental issues. Here, a dual-mode film that integrates solar heating and radiative cooling functionalities for year-round thermal management is introduced. The cooling side ofthe film, composed ofPCL-SiO2 composite nanofibers, exhibits an impressive solar reflection of0.98 and a mid-infrared emissivity of 0.91, resulting in sub-ambient cooling performance under intensive sunlight. Meanwhile, the heating side ofthe film, based on the ink side ofthe upcycled chip bags, efficiently harvests thermal energy from sunlight, leading to a temperature rise of16.5 °C. The cooling and heating modes ofthe film can be switched by flipping it. With its outstanding optical properties, weathering durability, and switchable heating and cooling modes, the dual-mode film holds great potential for year-round energy savings with minimal environmental impact due to its sustainable composition and easy fabrication.