Colored radiative cooling: progress and prospects

Xie, Bin; Liu, Yida; Wang, Xi; Qiu, Cheng‐Wei

doi:10.1016/j.mtener.2023.101302

Cited by 23 publications

(7 citation statements)

References 106 publications

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Section: Natural and Sustainable Materials For Radiative Coolingmentioning

confidence: 99%

Progress on Natural and Sustainable Materials for Daytime Radiative Cooling

Bijarniya,

Tripathi,

Bauri

et al. 2023

ACS Appl. Opt. Mater.

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Daytime radiative cooling has gained recent momentum in the field of sustainable cooling technology. Due to its passive nature, metamaterial development is a crucial requirement for further advancement in performance and application. Various structural materials have been developed to date; however, for simplicity and facile manufacturing, a polymer–particle structure is considered the most suitable metamaterial for radiative cooling. Other material structures are substrate dependent and are complex to produce. To increase sustainability, a polymer–particle structure with a natural polymer is becoming a rapidly growing field, which could be derived from natural resources like wood, pulp, and some natural fibers. Hence, in this paper, material structures and their outcomes are critically reviewed, and a special focus is made on natural and renewable materials. It is found that natural polymer-based materials have comparable thermal performance compared with commercial polymers. Apart from performance, sustainability aspects of various materials are elaborated in detail. Some transparent wood-based materials for building window applications are also included because of the recent need for energy-efficient buildings. The natural polymer-based radiative cooling coatings are environmentally friendly, processed from natural resources, and applied to renewable cooling technology, thereby supporting the circular economy concept.

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Section: Natural and Sustainable Materials For Radiative Coolingmentioning

confidence: 99%

Progress on Natural and Sustainable Materials for Daytime Radiative Cooling

Bijarniya,

Tripathi,

Bauri

et al. 2023

ACS Appl. Opt. Mater.

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“…The monotonous color fails to fulfill aesthetic requirements as well as visual comfort and may even contribute to light pollution. 23,24 Thus, developing colored radiative cooling materials is essential for expanding applications and matching functional demands.…”

Section: ■ Introductionmentioning

confidence: 99%

“…However, the requirement for high reflectance of radiative cooling results in materials that are primarily white in color, which restricts the possibilities for practical applications. The monotonous color fails to fulfill aesthetic requirements as well as visual comfort and may even contribute to light pollution. , Thus, developing colored radiative cooling materials is essential for expanding applications and matching functional demands.…”

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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“…Rapid industrial development accelerates temperature rise of the living environment in the context of global warming. − To combat the adverse effects of excessively high temperatures, traditional cooling devices such as air conditioners powered by substantial amounts of electricity are widely used, which results in extra heating effects and accelerates greenhouse gas emissions. − Passive radiative cooling (PRC) is a promising cooling technology due to its characteristics of zero energy consumption and zero pollution. − The key to achieving a lower temperature than that of surroundings through PRC is to obtain high solar reflectance (0.3–2.5 μm) and mid-infrared (8–13 μm) emittance. − In recent years, constructing photonic structures has been demonstrating great strategies to manipulate light–matter interactions at subwavelengths for controlling both solar reflection and thermal emission. − Among the reported methods, embedding inorganic dielectric fillers into polymer matrixes was generally adopted to enhance spectral solar reflectance. − However, the inevitable absorption in the ultraviolet region and the limited reflectivity in the solar region of these particles prevent the maximized reflectivity. , …”

Section: Introductionmentioning

confidence: 99%

Bioinspired Polymer Films with Surface Ordered Pyramid Arrays and 3D Hierarchical Pores for Enhanced Passive Radiative Cooling

He,

Zhang,

Zhou

et al. 2024

ACS Nano

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Passive radiative cooling (PRC) has been acknowledged to be an environmentally friendly cooling technique, and especially artificial photonic materials with manipulating light–matter interaction ability are more favorable for PRC. However, scalable production of radiative cooling materials with advanced biologically inspired structures, fascinating properties, and high throughput is still challenging. Herein, we reported a bioinspired design combining surface ordered pyramid arrays and internal three-dimensional hierarchical pores for highly efficient PRC based on mimicking natural photonic structures of the white beetle Cyphochilus’ wings. The biological photonic film consisting of surface ordered pyramid arrays with a bottom side length of 4 μm together with amounts of internal nano- and micropores was fabricated by using scalable phase separation and a quick hot-pressing process. Optimization of pore structures and surface-enhanced photonic arrays enables the bioinspired film to possess an average solar reflectance of ∼98% and a high infrared emissivity of ∼96%. A temperature drop of ∼8.8 °C below the ambient temperature is recorded in the daytime. Besides the notable PRC capability, the bioinspired film exhibits excellent flexibility, strong mechanical strength, and hydrophobicity; therefore, it can be applied in many complex outdoor scenarios. This work provides a highly efficient and mold replication-like route to develop highly efficient passive cooling devices.

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Colored radiative cooling: progress and prospects

Cited by 23 publications

References 106 publications

Progress on Natural and Sustainable Materials for Daytime Radiative Cooling

Progress on Natural and Sustainable Materials for Daytime Radiative Cooling

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

Bioinspired Polymer Films with Surface Ordered Pyramid Arrays and 3D Hierarchical Pores for Enhanced Passive Radiative Cooling

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