Hybrid thermochromic hydrogels based on HPC/PVA for smart windows with enhanced solar modulation
YUQIN FENG MING YANG YANBO ZHANG HONGJUN LIU HAIYAN JU GANG ZHANG WENXIA MA YAQI WU YUNZI YU YONGSHENG YANG DEZHENG LIU
Click here to view fulltext PDF
Energy-saving smart windows could reduce building energy consumption by dynamically regulating solar transmission without consuming additional energy. However, current thermochromic smart windows based on hydroxypropyl cellulose (HPC) are still facing challenges, such as low durability and unsatisfactory in regulating the solar infrared region. To expand hydrogels’ modulation ability of infraredregion, hydrogels with temperature-sensitive properties of polyvinyl alcohol (PVA) and HPC were prepared and applied in thermochromic smart windows areal. The HPC-PVA hydrogels have an ultra-high luminous transmission in the visible light rather than infrared light regions, blocking most of the sunlight when the temperature increases, thus greatly enhancing the solar modulating ability (ΔTsol) and infrared transmittancemodulation (ΔTIR). The 4 wt.% PVA doped in HPC exhibits the best solar modulation ability (ΔTIR(20–50°C), 5.5%, ΔTsol(20–50°C), 19.4% and Tlum, 20°C 91.3%). In addition, these high-performance and temperature-sensitive materials have a high repetition and durability. The hydrogels could obtain adjusting broadbandsunlight smart windows with sandwich structure glasses.
Hybrid thermochromic hydrogels HPC-PVA were designed by one-step hydrothermal method categories. The hydrogels could increase the temperature-responsive of smart hydrogels, enhance solar modulation and have high luminous transmission.
YUQIN FENG1 2 MING YANG1 2 YANBO ZHANG1 HONGJUN LIU3 HAIYAN JU1 2 GANG ZHANG1 2 WENXIA MA1 2 YAQI WU1 2 YUNZI YU1 2 YONGSHENG YANG1 2 DEZHENG LIU4
Volume 135, 2023
Continuous Article Publishing mode
Click here for Editorial Note on CAP Mode