Daytime radiative cooling with clear epoxy resin

Liu, Junwei; Zhang, Debao; Jiao, Shifei; Zhou, Zhihua; Zhang, Zhuofen; Gao, Feng

doi:10.1016/j.solmat.2019.110368

Cited by 44 publications

(17 citation statements)

References 31 publications

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“…Many kinds of selective emitters, such as thin-film stack structures, metamaterial structures, and polymer-based structures, have been reported as increasing attention has been directed toward the investigation of PDRC. − ,− Regarding thin-film stacked multilayer-structured radiative coolers and photonic-structured radiative coolers, in 2014, Raman suggested a seven-layer stacked one-dimensional (1-D) photonic radiative cooler designed by comprehensive optical simulations; they designed a cooling temperature measuring apparatus for outdoor measurements . The 1-D photonic radiative cooler comprising alternately stacked layers of hafnium oxide (HfO 2 ) and silicon oxide (SiO 2 ) over a silver reflecting layer exhibited 97% solar reflectance with high emissivity in the atmospheric transparency window.…”

Section: Introductionmentioning

confidence: 99%

Spectrally Selective Nanoparticle Mixture Coating for Passive Daytime Radiative Cooling

Chae

Lim

et al. 2021

ACS Appl. Mater. Interfaces

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Passive daytime radiative cooling, which is a process that removes excess heat to cold space as an infinite heat sink, is an emerging technology for applications that require thermal control. Among the different structures of radiative coolers, multilayerand photonic-structured radiative coolers that are composed of inorganic layers still need to be simple to fabricate. Herein, we describe the fabrication of a nanoparticle-mixture-based radiative cooler that exhibits highly selective infrared emission and low solar absorption. Al 2 O 3 , SiO 2 , and Si 3 N 4 nanoparticles exhibit intrinsic absorption in parts of the atmospheric transparency window; facile one-step spin coating of a mixture of these nanoparticles generates a surface with selective infrared emission, which can provide a more powerful cooling effect compared to broadband emitters. The nanoparticle-based radiative cooler exhibits an extremely low solar absorption of 4% and a highly selective emissivity of 88.7% within the atmospheric transparency window owing to the synergy of the optical properties of the material. The nanoparticle mixture radiative cooler produces subambient cooling of 2.8 °C for surface cooling and 1.0 °C for space cooling, whereas the Ag film exhibits an above-ambient cooling of 1.1 °C for surface cooling and 3.4 °C for space cooling under direct sunlight.

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Section: Introductionmentioning

confidence: 99%

Spectrally Selective Nanoparticle Mixture Coating for Passive Daytime Radiative Cooling

Chae

Lim

et al. 2021

ACS Appl. Mater. Interfaces

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“…[ 10 ] Extensive studies have been conducted on radiative coolers using thin‐layer deposited films, photonic crystals, metamaterials, nanoparticles (NPs), and polymer‐based composites. [ 4,5,8,9,11–30 ] In 2014, daytime radiative cooling was spotlighted when Fan et al. reported a photonic radiative cooler that had a sophisticatedly engineered structure with alternatively stacked dielectric layers on a silver‐deposited silicon substrate.…”

Section: Introductionmentioning

confidence: 99%

“…[10] Extensive studies have been conducted on radiative coolers using thin-layer deposited films, photonic crystals, metamaterials, nanoparticles (NPs), and polymerbased composites. [4,5,8,9,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] In 2014, daytime radiative cooling was spotlighted when Fan et al reported a photonic radiative cooler that had a sophisticatedly engineered structure with alternatively stacked dielectric layers on a silver-deposited silicon substrate. [5] The photonic radiative cooler exhibited low absorptivity (3%) in the solar spectral region and high emissivity in the atmospheric transparency window, enabling subambient daytime radiative cooling with temperature drops of 4.9 °C and an experimentally determined cooling power of 40.1 Wm −2 under direct sunlight.…”

Section: Introductionmentioning

confidence: 99%

“…[21] Selective emitter-like optical characteristics can be observed in sample structures from previous studies of thin-layer deposited films, photonic crystals, and bulk material; [5,[11][12][13][14][15][16][17][18][19]30] meanwhile, broadband emitter-like optical characteristics with high emissivity in the IR region (2.5-15 µm), which contains the atmospheric transparency window, can be identified in polymer-based radiative cooling studies. [8,[23][24][25][26][27][28][29] Selective emitters have been found to be superior in cooling compared with broadband emitters, as they are hardly affected by atmospheric emission. [30] Furthermore, considering that selective emitters are mainly composed of inorganic materials with intrinsically good mechanical properties and absence of peeling or yellowing issues, selective emitters have a long-life span compared with polymer-based broadband emitters for passive radiative cooling.…”

Section: Introductionmentioning

confidence: 99%

“…Subsequently, many types of materials and systems with simple structures have been proposed for fabrication of polymer-based radiative coolers with broadband emitter-like optical characteristics and adopted to real-world applications, including those involving the human body and water cooling. [4,8,[25][26][27][28][29] Meanwhile, photonic crystal-structured radiative coolers, mainly composed of inorganic materials in the form of thin-layer deposited film, still remain as complex structures that require rigorously determined thicknesses for each layer to achieve high emissivity in the atmospheric transparency window and, as such, are difficult to fabricate. [14,18,30] YANG, Yang et al suggested bulk lithium fluoride substrate with backside silver reflective layer which exhibits good optical properties for daytime radiative cooling to address this complicity of radiative cooling structure composed of inorganic materials.…”

Section: Introductionmentioning

confidence: 99%

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High‐Performance Daytime Radiative Cooler and Near‐Ideal Selective Emitter Enabled by Transparent Sapphire Substrate

et al. 2020

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Daytime radiative cooling serving as a method to pump heat from objects on Earth to cold outer space is an attractive cooling option that does not require any energy input. Among radiative cooler structures, the multilayer-or photonic-structured radiative cooler, composed of inorganic materials, remains one of the most complicated structures to fabricate. In this study, transparent sapphire-substrate-based radiative coolers comprising a simple structure and selective emitter-like optical characteristics are proposed. Utilizing the intrinsic optical properties of the sapphire substrate and adopting additional IR emissive layers, such as those composed of silicon nitride thin film or aluminum oxide nanoparticles, high-performance radiative coolers can be fabricated with a low mean absorptivity (3-4%) at 0.3-2.5 µm and a high mean emissivity of over 90% at 8-13 µm. Experiments show that the fabricated radiative coolers reach temperature drops of ≈10°C in the daytime. From the theoretical calculations of radiative cooling performance, the sapphire-substrate-based radiative coolers demonstrate a net cooling power as high as 100 Wm −2 .

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Recent Advances in Material Engineering and Applications for Passive Daytime Radiative Cooling

Cao

et al. 2022

Advanced Optical Materials

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Figure 1. Outline of the current review of PDRC. The inner layer represents the essential factors that dictate the performance of the PDRC emitter, whereas the middle layer includes the representative types of materials for constructing the PDRC emitter, and the outer layer represents various realworld applications of the PDRC emitter. In the middle layer: multilayered inorganic materials (reproduced with permission. [13]

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Daytime radiative cooling with clear epoxy resin

Cited by 44 publications

References 31 publications

Spectrally Selective Nanoparticle Mixture Coating for Passive Daytime Radiative Cooling

Spectrally Selective Nanoparticle Mixture Coating for Passive Daytime Radiative Cooling

High‐Performance Daytime Radiative Cooler and Near‐Ideal Selective Emitter Enabled by Transparent Sapphire Substrate

Recent Advances in Material Engineering and Applications for Passive Daytime Radiative Cooling

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