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Research Article

Porous block copolymer films with self-adjustable optical transmittance and passive radiative cooling

Xue Meng1,§, Weiming Tang1,§, Shuyun Zhuo2,§, Jince Zhao2, Zixuan Ren2, Zhonghe Sun2, Hao Yan2, Tianyi Zhao2( ), Ziguang Zhao1( ), Mingjie Liu2( )
School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, China
Key Laboratory of Bio-Inspired Smart Interfacial, Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing 100191, China

§ Xue Meng, Weiming Tang, and Shuyun Zhuo contributed equally to this work.

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Graphical Abstract

The block copolymer films with porous structures possessed excellent passive radiative cooling derived from the high solar reflectance (0.3–2.5 μm) and infrared emittance (8–13 μm). Meanwhile, the film had the property of self-adjustable optical transmittance by changing the polarity of the post-treatment solvent.

Abstract

As an energy-free cooling technique, radiative cooling has garnered significant attention in the field of energy conservation. However, traditional radiative cooling films often possess static optical properties and their inherent opacity limits their applications in building such as windows. Therefore, there exists a requirement for passive radiative cooling films endowed with adjustable transmittance. Here we report the porous block copolymer films with self-adjustable optical transmittance and passive radiative cooling. In a result, the film exhibited a high solar reflectance (0.3–2.5 μm) of 96.9% and a high infrared emittance (8–13 μm) of 97.9%. Outdoor experiments demonstrated that the film surface temperature was 6.6 °C lower than ambient temperature, with a cooling power of 104.8 W·m–2. In addition, the film’s transmittance can be regulated by altering the polarity of the post-processing solvent, providing an effective approach for regulating indoor light intensity and thermal balance, thereby enhancing the applicability of radiative cooling.

Keywords

porous structurepassive radiative coolingblock copolymerself-adjustable optical transmittance

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Nano Research
Volume 17 Issue 9,
September 2024
Pages 8472-8478
DOI: 10.1007/s12274-024-6778-z
Cite this article:
Meng X, Tang W, Zhuo S, et al. Porous block copolymer films with self-adjustable optical transmittance and passive radiative cooling. Nano Research, 2024, 17(9): 8472-8478. https://doi.org/10.1007/s12274-024-6778-z
Topics:
Polymer films Thin films

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Received: 26 April 2024
Revised: 15 May 2024
Accepted: 22 May 2024
Published: 02 July 2024
© Tsinghua University Press 2024
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