Hybrid thermochromic hydrogels based on HPC/PVA for smart windows with enhanced solar modulation,Journal of Chemical Sciences

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Hybrid thermochromic hydrogels based on HPC/PVA for smart windows with enhanced solar modulation
Journal of Chemical Sciences ( IF 1.7 ) Pub Date : 2022-02-05 , DOI: 10.1007/s12039-021-02024-y
Yuqin Feng _{1,

2} , Ming Yang _{1,

2} , Yanbo Zhang ₁ , Haiyan Ju _{1,

2} , Gang Zhang _{1,

2} , Wenxia Ma _{1,

2} , Yaqi Wu _{1,

2} , Yunzi Yu _{1,

2} , Yongsheng Yang _{1,

2} , Dezheng Liu ₃ , Hongjun Liu ₄

Affiliation

Abstract

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 infrared region, 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 (∆T_sol) and infrared transmittance modulation (∆T_IR). The 4 wt.% PVA doped in HPC exhibits the best solar modulation ability (∆T_{IR, (20–50 °C)} 5.5%, ΔT_{sol, (20–50 °C)} 19.4% and T_{lum, 20 °C} 91.3%). In addition, these high-performance and temperature-sensitive materials have a high repetition and durability. The hydrogels could obtain adjusting broadband sunlight smart windows with sandwich structure glasses.

Graphic abstract

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.

中文翻译：

基于 HPC/PVA 的混合热致变色水凝胶用于增强太阳能调制的智能窗户

摘要

节能智能窗可以通过动态调节太阳能传输而不消耗额外的能源来降低建筑能耗。然而，目前基于羟丙基纤维素（HPC）的热致变色智能窗仍面临耐久性低、太阳红外区域调节不理想等挑战。为扩展水凝胶对红外区域的调制能力，制备了具有聚乙烯醇（PVA）和HPC温度敏感特性的水凝胶，并将其应用于热致变色智能窗领域。HPC-PVA水凝胶在可见光区域而非红外光区域具有超高的透光率，在温度升高时阻挡了大部分阳光，从而大大提高了太阳能调节能力（ΔT _sol) 和红外透射率调制 ( ΔT _IR )。在 HPC 中掺杂的 4 wt.% PVA 表现出最佳的太阳能调制能力（Δ T _{IR，（20–50 °C）} 5.5%，Δ T _{sol，（20–50 °C）} 19.4% 和T _{lum，20 °C} 91.3%）。此外，这些高性能和温度敏感的材料具有很高的重复性和耐用性。该水凝胶可以获得具有夹层结构玻璃的可调节宽带阳光智能窗。