Switchable passive radiative cooling via mechanical stress for stretchable smart window

IF 3.4 4区工程技术 Q2 POLYMER SCIENCE

Macromolecular Research Pub Date : 2025-03-26 DOI:10.1007/s13233-024-00363-6

Tae-Ho Kim, Sang Jun Kim, Su Hwan Lee, Sang Woo Bae, Min Ku Kim, Young-Hoon Kim

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引用次数: 0

Abstract

We report a mechanically stretchable smart window passive radiative cooler (SW-PRC) that can reversibly switch between opaque and transparent states in response to external mechanical stress while maintaining efficient heat dissipation through the atmospheric window in both optical states. To fabricate the SW-PRC, we modify the surface of SiO₂ nanoparticles (NPs) using trimethylchlorosilane (TMSCl). The surface-modified SiO₂ nanoparticles (SM-SiO₂ NPs) exhibit hydrophobic properties, preventing agglomeration of SiO₂ NPs within a polydimethylsiloxane (PDMS) matrix and achieving a homogenous SW-PRC with a low haze factor (20–30%) and high visible-light transmittance (≥ 90%). These composites also demonstrate high emissivity in the long-wave infrared region, confirming their radiative cooling capabilities. When the SW-PRC is stretched by more than 5%, air voids form around the SiO₂ NPs, causing visible-light scattering and resulting in hazy, non-transparent films. This optical conversion between transparent and hazy states can be repeated over 20 times. The switchable SW-PRC has shown a temperature drop of 3.25 °C in its unstretched state and up to 4.75 °C when stretched by 30%. We believe that our switchable SW-PRC represents an advancement in overcoming the limitations of current smart window applications.

Graphical Abstract

The surface-modified SiO₂ nanoparticles within a polydimethylsiloxane matrix demonstrate an optically switchable and stretchable passive radiative cooler.

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可伸缩智能窗的机械应力可切换被动辐射冷却

我们报道了一种机械可拉伸的智能窗口被动辐射冷却器（SW-PRC），它可以在响应外部机械应力的不透明和透明状态之间可逆切换，同时在两种光学状态下通过大气窗口保持有效的散热。为了制备SW-PRC，我们使用三甲基氯硅烷（TMSCl）修饰SiO2纳米颗粒（NPs）的表面。表面修饰的SiO2纳米颗粒（SM-SiO2 NPs）具有疏水性，可防止SiO2 NPs在聚二甲基硅氧烷（PDMS）基体中团聚，并获得均匀的swi - prc，具有低雾系数（20-30%）和高可见光透过率（≥90%）。这些复合材料在长波红外区域也显示出高发射率，证实了它们的辐射冷却能力。当SW-PRC被拉伸超过5%时，二氧化硅NPs周围会形成空洞，导致可见光散射，形成朦胧的非透明薄膜。这种透明和朦胧状态之间的光学转换可以重复20多次。可切换SW-PRC在未拉伸状态下温度下降3.25°C，拉伸30%时温度下降4.75°C。我们相信，我们的可切换SW-PRC代表了克服当前智能窗口应用程序局限性的一种进步。摘要在聚二甲基硅氧烷基体中进行表面修饰的二氧化硅纳米颗粒展示了一种光学可切换和可拉伸的被动辐射冷却器。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Macromolecular Research 工程技术-高分子科学

CiteScore

4.70

自引率

8.30%

发文量

100

审稿时长

1.3 months

期刊介绍： Original research on all aspects of polymer science, engineering and technology, including nanotechnology Presents original research articles on all aspects of polymer science, engineering and technology Coverage extends to such topics as nanotechnology, biotechnology and information technology The English-language journal of the Polymer Society of Korea Macromolecular Research is a scientific journal published monthly by the Polymer Society of Korea. Macromolecular Research publishes original researches on all aspects of polymer science, engineering, and technology as well as new emerging technologies using polymeric materials including nanotechnology, biotechnology, and information technology in forms of Articles, Communications, Notes, Reviews, and Feature articles.