Broadband Light Management with Thermochromic Hydrogel Microparticles for Smart Windows
Broadband Light Management with Thermochromic Hydrogel Microparticles for Smart Windows
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DOI：
10.1016/j.joule.2018.10.019
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发表时间：
2019-01-16
期刊：
影响因子：
39.8
通讯作者：
Fang, Nicholas Xuanlai
中科院分区：
文献类型：
--
作者：
Li, Xin-Hao;Liu, Chang;Fang, Nicholas Xuanlai
通过窗户控制太阳能传输有望降低建筑能耗。然而，目前的显色技术通过相变材料的可调消光来调节太阳增益的能力仍然远未达到最佳。我们报道了一种通过控制颗粒尺寸和内部结构来调节光散射行为来优化温度响应性水凝胶颗粒透过率调制范围的策略。合成了一种新型热致变色材料--poly(N-isopropylacrylamide)-2-aminoethylmethacrylate盐酸盐(PNIPAMAEMA)微粒。PNIPAM-AEMA微粒的平均尺寸从25℃时的1,388 nm到35℃时的546 nm不等，贡献了前所未有的75.6%的红外透过率调制。在25℃时也获得了87.2%的高透光率。对PNIPAM-AEMA颗粒的可调谐散射行为的研究为此类材料的光管理提供了机理上的见解，其应用领域超出了节能智能窗的范围。
Control of solar transmission through windows promises to reduce building energy consumption. However, the ability of current chromogenic technologies to regulate solar gain with the tunable extinction of phase-change materials is still far from optimum. We report a strategy for optimizing the transmittance modulation range of temperature-responsive hydrogel particles by means of tuning the light-scattering behaviors through controlling particle size and internal structure. An emerging thermochromic material, poly(N-isopropylacrylamide)-2-aminoethylmethacrylate hydrochloride (pNIPAm-AEMA) microparticles, was synthesized to demonstrate this strategy. The average size of pNIPAm-AEMA microparticles varies from 1,388 nm at 25 degrees C to 546 nm at 35 degrees C, contributing to an unprecedented infrared transmittance modulation of 75.6%. A high luminous transmittance of 87.2% at 25 degrees C had also been accomplished. An investigation of the tunable scattering behaviors of pNIPAm-AEMA particles provided mechanistic insight into light management by this class of materials, the application field of which is beyond energy-saving smart windows.