Scalable Colored Sub-Ambient Radiative Coolers Based on a Polymer-Tamm Photonic Structure

Huang, Tianzhe; Chen, Qixiang; Huang, Jinhua; Lu, Yuehui; Xu, Hua; Zhao, Meng; Xu, Yao; Song, Weijie

doi:10.2139/ssrn.4131645

Cited by 3 publications

(3 citation statements)

References 32 publications

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“…However, the complicated structure design and high precision requirement of the structural color would limit large-scale fabrication of the material. 32,33 Pigmentary colors 34−36 are produced by the selective absorption of the visible spectrum with subtractive hues. Chen et al 37 pigment top layer and a porous solar-scattering bottom layer that achieved 3.0−15.6 °C cooling compared to commercial paint.…”

Section: ■ Introductionmentioning

confidence: 99%

Durable and Scalable Superhydrophobic Colored Composite Coating for Subambient Daytime Radiative Cooling

Wang,

Xue,

et al. 2024

ACS Sustainable Chem. Eng.

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Passive daytime radiative cooling without any energy input has attracted significant attention due to its ability to spontaneously radiate heat into cold outer spaces. However, the distinctive structure and optical properties made radiative cooling materials white in appearance, which limits their use in actual application. In this study, poly(dimethylsiloxane) (PDMS), poly-(ethyl cyanoacrylate) (PECA), polystyrene (PS), and pigments that selectively absorb visible light with high emissivity were adopted to fabricate a colored superhydrophobic radiative cooling coating through spraying and nonsolvent-induced phase separation. The asfabricated yellow, red, and green PS/PDMS/PECA composite coatings exhibited high solar reflectivities of 92.8, 89.8, and 86.6% with strong infrared emissivities of 95.4, 95.3, and 96.3%, respectively, which correspondingly realized a subambient temperature reduction of 5.3, 3.5, and 2.5 °C. The self-cleaning property of the coating caused by superhydrophobicity helps protect the coating from contamination, favoring a stable outdoor cooling performance. Additionally, the composite coating was resistant to different chemical immersions, ultraviolet (UV) irradiation, sand impact, water impact, and sandpaper abrasion, which might improve the applicability of the material and promote the cooling materials toward large-area production for practical application.

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Section: ■ Introductionmentioning

confidence: 99%

Durable and Scalable Superhydrophobic Colored Composite Coating for Subambient Daytime Radiative Cooling

Wang,

Xue,

et al. 2024

ACS Sustainable Chem. Eng.

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“…Various daytime radiative-cooling coatings have been developed over recent years and succeeded in cooling to sub-ambient temperatures 9 , such as inorganic particles dispersion 10,11 , porous polymers 12,13 , micro-structures 14 , and nano-fabricated layered structures [15][16][17] . These studies 18,19 have demonstrated the important advancement in modulation of the full spectral range of solar and blackbody radiation [20][21][22] . However, these materials are bene cial for energy savings in summer but leads to high heating costs in winter 23 .…”

Section: Introductionmentioning

confidence: 99%

Pillar-Pore-Structured Nanophotonic Coating with Superior Solar and Thermal Modulation Abilities

Yanfeng

2024

Preprint

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There is a growing focus on the development of advanced materials to enhance energy efficiency in space heating and cooling, which accounts for 13% of the annual consumption of global energy. Wavelength-selective dynamic regulation is undisputedly requisite to solve this problem. Radiative cooling materials work in the wavelength span of 8-14 µm, which is effective in heat dissipation. However, their fixed emissivity results in unpleasant undercooling. Adaptive cooling materials can change emissivity in response to temperature shifts, solving the problem of overcooling, however they absorb too much solar heat in daytime, especially in summer. Hence, a material is requisite to have high reflectance in solar wavelengths (0.25 – 2.5 µm). To address this issue, we propose a temperature-adaptive radiative cooling coating with high solar reflectance that efficiently reflects solar radiation and automatically switches its sky-window emissivity from 0.19 to 0.74, delivering an 85.92% solar reflectance for optimal energy efficiency and all-year-round thermal comfort within a specific climate zone. The simulations demonstrate that our sample surpasses existing roofing coatings in terms of energy efficiency across different climate zones, particularly those with substantial seasonal variations.

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“…In 2024, Li et al 16 theoretically proposed an adaptive radiative cooling system based on W− VO 2 , where the spectra at high and low temperatures can be easily adjusted by varying the thickness of each layer and the ratio of W−VO 2 . Currently, such cooling techniques are employed in solar cells, 17 thermoelectric generator cooling, 18 triboelectric nanogenerator, 19−21 thermoelectric power generator, 22 radiative coolers that modulate color, 11,15,23,24 transparent radiative cooling window, 9,25,26 and so on. When energy-saving windows are combined with radiative cooling, the concept of radiative cooling window has emerged.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Dielectric-Metal Multilayer Structure for Color-Preserving Radiative Cooling Window

Liu,

Chen,

Lin

2024

ACS Omega

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Radiative cooling window has been designed to emit infrared radiation in the atmospheric transparency window and reflects near-infrared light while allowing visible light to pass through. However, improvements are still needed in the transmissivity of visible light, the reflectivity of near-infrared light, and emissivity of mid-infrared spectra. This paper proposes a color-preserving radiative cooling window consisting of a multilayer film as a transparent nearinfrared reflector and polydimethylsiloxane (PDMS) as a thermal emitter. This design involves optimizing the types of film materials, the number of layers, and the thicknesses of the films through a genetic algorithm. The performance of multilayer films with various layer numbers is compared, and we choose 7-layer multilayer film (Al 2 O 3 /Ag/Al 2 O 3 /Ag/Al 2 O 3 /Ag/Al 2 O 3 ) as the transparent near-infrared reflector. Then, we analyze its spectral characteristics in depth. Sequentially, we place a 100-μm-thick PDMS as a thermal emitter above the transparent near-infrared reflector. By combining the transparent near-infrared reflector with the PDMS and utilizing genetic algorithm, a color-preserving radiative cooling window has been achieved with flat and broadband average visible transmittance (86%), high average near-infrared reflectance (86%), high average thermal emissivity (95%) in the atmospheric window, and the drop of temperature (22.3, 21.2, and 15.8 K when nonradiative heat coefficient is, respectively, 0, 6, and 12 W/m 2 /K).

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Scalable Colored Sub-Ambient Radiative Coolers Based on a Polymer-Tamm Photonic Structure

Cited by 3 publications

References 32 publications

Durable and Scalable Superhydrophobic Colored Composite Coating for Subambient Daytime Radiative Cooling

Durable and Scalable Superhydrophobic Colored Composite Coating for Subambient Daytime Radiative Cooling

Pillar-Pore-Structured Nanophotonic Coating with Superior Solar and Thermal Modulation Abilities

Optimization of Dielectric-Metal Multilayer Structure for Color-Preserving Radiative Cooling Window

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