Jiang Yi, Wang Yunlong, Kong Deshuo, Chen Zipeng, Yang Zhengwei, Cao Ningning, Chi Haowen, Zhu Shining, Zhang Qiuhong, Zhu Jia, Zhu Bin
National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Jiangsu Key Laboratory of Artificial Functional Materials, Frontiers Science Center for Critical Earth Material Cycling, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
Key Laboratory of High Performance Polymer Material and Technology of MOE, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
Natl Sci Rev. 2024 Nov 13;12(2):nwae408. doi: 10.1093/nsr/nwae408. eCollection 2025 Feb.
Thermochromic smart windows effectively reduce the energy consumption for buildings through passive light modulation including the transmission of visible (T) and near-infrared (T) light, and the emissivity of mid-infrared (ε) light in response to ambient temperature change. However, thermochromic windows that maintain high T while modulating T and ε simultaneously are highly desirable but still challenging. Here, we develop a thermochromic smart window based on a two-way shape memory polymer to enable reversible transformation and achieve T modulation of 44.0% and ε modulation of 76.5% while maintaining high T (>50%). Compared to traditional windows based on silica glass, this device shows 4°C lower temperature in summer daytime, 2°C higher in winter daytime, and 1°C higher in spring nighttime. It is expected that our device can achieve greater annual energy savings in comparison with commercial glass anywhere in the world and promote the progress of thermochromic windows for energy-efficient buildings.
热致变色智能窗户通过被动光调制有效地降低建筑物的能源消耗，包括可见光（T）和近红外光（T）的透射以及中红外光（ε）的发射率，以响应环境温度变化。然而，同时保持高T并调节T和ε的热致变色窗户是非常理想的，但仍然具有挑战性。在此，我们开发了一种基于双向形状记忆聚合物的热致变色智能窗户，以实现可逆转变，并在保持高T（>50%）的同时实现44.0%的T调制和76.5%的ε调制。与基于石英玻璃的传统窗户相比，该装置在夏季白天温度低4°C，冬季白天温度高2°C，春季夜间温度高1°C。预计我们的装置与世界上任何地方的商业玻璃相比，每年可实现更大的节能，并推动节能建筑用热致变色窗户的发展。
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