Thermally Responsive Hydrogels for Passive Temperature Regulation under Direct Sunlight

doi:10.1002/adpr.202200253

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	Thermally Responsive Hydrogels for Passive Temperature Regulation under Direct Sunlight
	D. Xie, W. Li, C. A. Richards, H. Gao, C. Chen, N. Miljkovic, S. Fan, J. Lee, S. N. Joshi and P. V. Braun
	2023
发表期刊	Advanced Photonics Research
ISSN	26999293
卷号	4 期号:4
摘要	By spontaneously emitting midinfrared radiation to outer space through the atmospheric window and reflecting sunlight, daytime radiative coolers achieve notable passive cooling performance. However, existing daytime radiative cooling systems generally lack the ability to adaptively switch between heating and cooling states based on ambient conditions. Herein a passive thermal regulation system that features a temperature-dependent switchable solar reflectance from 0.05 (low temperature) to 0.8 (high temperature) is presented. This, along with a ≈0.95 midinfrared emittance, it enables automatic switching between radiative cooling and solar heating. Switchablity is enabled using a poly(N-isopropylacrylamide) (PNIPAM) hydrogel which exhibits high solar scattering above its tunable lower critical solution temperature (LCST) and transparency below its LCST. The lower part of the hydrogel is loaded with graphite to absorb solar energy in the heating state. In testing under sunny and partly cloudy outside conditions, this system maintains a temperature close to the set LCST. © 2023 The Authors. Advanced Photonics Research published by Wiley-VCH GmbH.
DOI	10.1002/adpr.202200253
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文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/68047
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	D. Xie, W. Li, C. A. Richards, H. Gao, C. Chen, N. Miljkovic, S. Fan, J. Lee, S. N. Joshi and P. V. Braun. Thermally Responsive Hydrogels for Passive Temperature Regulation under Direct Sunlight[J]. Advanced Photonics Research,2023,4(4).
APA	D. Xie, W. Li, C. A. Richards, H. Gao, C. Chen, N. Miljkovic, S. Fan, J. Lee, S. N. Joshi and P. V. Braun.(2023).Thermally Responsive Hydrogels for Passive Temperature Regulation under Direct Sunlight.Advanced Photonics Research,4(4).
MLA	D. Xie, W. Li, C. A. Richards, H. Gao, C. Chen, N. Miljkovic, S. Fan, J. Lee, S. N. Joshi and P. V. Braun."Thermally Responsive Hydrogels for Passive Temperature Regulation under Direct Sunlight".Advanced Photonics Research 4.4(2023).

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