Superhydrophobic porous film for daytime radiative cooling

Wang, Hui-Di; Xue, Chao-Hua; Guo, Xiao-Jing; Liu, Bing-Ying; Ji, Zhanyou; Huang, Meng-Chen; She, Jia

doi:10.1016/j.apmt.2021.101100

Cited by 59 publications

(42 citation statements)

References 53 publications

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“…The 8-channel K thermocouple (Changzhou Jingailian Electricaltech Co., Ltd.) served to record the real-time temperature in the pockets. Additionally, sunlight intensity and relative humidity were recorded, as detailed in the previously published articles by our research group. , For comparison, the device without PE shielding was also used to practically evaluate the PDRC performance of SFCR films.…”

Section: Methodssupporting

confidence: 74%

“…The relevant instrument models and test methods using a xenon lamp to simulate solar radiation can be found in our previously published articles. , …”

Section: Methodsmentioning

confidence: 99%

“…Additionally, the implementation and preparation of these PDRC materials generally depend on stringent and nanoscale precision fabrication, strict restrictions for a solvent–nonsolvent system, and accurate regulation on particle size and distribution, which extremely limits their real-life scalable cooling applications. Furthermore, PDRC surfaces as outdoor shelters are susceptible to rainwater soaking and accumulation of contaminants such as muddy water or dust particles, thus damaging the cooling performance and shortening the service life of the materials. , Therefore, it is highly significant to design and produce high-performance PDRC materials with simple operation, large-scale area, and robust anticontamination properties.…”

Section: Introductionmentioning

confidence: 99%

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Scalable Superhydrophobic Flexible Nanofiber Film for Passive Daytime Radiative Cooling

Xue

Liu

et al. 2022

ACS Appl. Polym. Mater.

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Passive daytime radiative cooling technology can cool objects without any energy consumption. Although some progress has been made, there are still challenges in manufacturing low-cost, anticontaminant, and weathering-resistant radiative coolers for long-term cooling. Herein, a superhydrophobic flexible cooling radiator (SFCR) as a film is fabricated by a facile, inexpensive, and scalable electrospinning and electrospraying method. The SFCR film consists of poly(vinylidene fluoride-co-hexafluoropropylene) fiber frameworks adhered to by numerous microaggregates from SiO2 nanoparticles. The SFCR film exhibited a strong solar reflectivity of 98.5% and an average emissivity of more than 95%. It also showed superior superhydrophobicity and wettability with a static water contact angle of 156° and sliding angle of 2.2°. The average temperature drop of the film was 11.6 °C compared to the air around the film under sunlight. Importantly, the self-cleaning effect of the SFCR film robustly protects its surface against outdoor contamination and is conducive to sustainable cooling. This SFCR film integrating radiative cooling with self-cleaning characteristics is promising for scalable production and can be utilized on buildings, vehicles, and other terrestrial objects.

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Section: Methodssupporting

confidence: 74%

“…The relevant instrument models and test methods using a xenon lamp to simulate solar radiation can be found in our previously published articles. , …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Scalable Superhydrophobic Flexible Nanofiber Film for Passive Daytime Radiative Cooling

Xue

Liu

et al. 2022

ACS Appl. Polym. Mater.

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“… 3 , 4 At present, the radiative cooling works reported have basically achieved a good effect that can effectively cool the objects in hot summer. 5 − 10 However, most of the radiative cooling materials reflect and radiate heat all year round, which saves energy in summer but increases energy consumption in winter.…”

Section: Introductionmentioning

confidence: 99%

A Superhydrophobic Dual-Mode Film for Energy-Free Radiative Cooling and Solar Heating

et al. 2022

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Traditional electric cooling in summer and coal heating in winter consume a huge amount of energy and lead to a greenhouse effect. Herein, we developed an energy-free dual-mode superhydrophobic film, which consists of a white side with porous coating of styrene-ethylene-butylene-styrene/SiO 2 for radiative cooling and a black side with nanocomposite coating of carbon nanotubes/polydimethylsiloxane for solar heating. In the cooling mode with the white side, the film achieved a high sunlight reflection of 94% and a strong long-wave infrared emission of 92% in the range of 8–13 μm to contribute to a temperature drop of ∼11 °C. In the heating mode with the black side, the film achieved a high solar absorption of 98% to induce heating to raise the air temperature beneath by Δ T of ∼35.6 °C. Importantly, both sides of the film are superhydrophobic with a contact angle over 165° and a sliding angle near 0°, showing typical self-cleaning effects, which defend the surfaces from outdoor contamination, thus conducive to long-term cooling and heating. This dual-mode film shows great potential in outdoor applications as coverings for both cooling in hot summer and heating in winter without an energy input.

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“…[27][28][29] For practical applications, it is imperative to frequently clean to maintain the unique optical properties of PDRC coatings, which is time-and labor-intensive, hindering real-life applications. 30,31 In addition, state-of-the-art PDRC still suffers from water accumulation during long-term operation, especially in wet areas, which will significantly compromise their performance. 32 Porous structures with superhydrophobic surfaces offer the potential to prevent surface contamination.…”

Section: Introductionmentioning

confidence: 99%

Sustainable and self-cleaning bilayer coatings for high-efficiency daytime radiative cooling

2022

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Superhydrophobic porous film for daytime radiative cooling

Cited by 59 publications

References 53 publications

Scalable Superhydrophobic Flexible Nanofiber Film for Passive Daytime Radiative Cooling

Scalable Superhydrophobic Flexible Nanofiber Film for Passive Daytime Radiative Cooling

A Superhydrophobic Dual-Mode Film for Energy-Free Radiative Cooling and Solar Heating

Sustainable and self-cleaning bilayer coatings for high-efficiency daytime radiative cooling

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