Eco-friendly preparation of durable superhydrophobic porous film for daytime radiative cooling

Fan, Tingting; Xue, Chao-Hua; Guo, Xiao-Jing; Wang, Hui-Di; Huang, Meng-Chen; Zhang, Dongmei; Deng, Fuquan

doi:10.1007/s10853-022-07292-8

Cited by 14 publications

(3 citation statements)

References 72 publications

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“…A solvent-free or green-solvent approach is necessary to reduce the dependence on complex chemicals. For instance, water droplets can be used as pore templates and then removed through heating to create pores with controlled sizes …”

Section: Discussionmentioning

confidence: 99%

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Superhydrophobic Designs for Durable Radiative Cooling

Zhong,

Gao,

Wang

2024

Langmuir

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Passive radiative cooling technology is an eco-friendly and energyfree alternative to conventional cooling systems. However, a major challenge in implementing radiative cooling in an outdoor environment is the presence of contamination, which significantly degrades the cooling effectiveness. In response to this challenge, researchers have explored superhydrophobic radiative coolers with self-cleaning abilities as a potential solution. In this Perspective, we summarize the latest progress and highlight certain design principles and strategies for integrating superhydrophobicity into radiative cooling structures. These strategies can be classified into three distinct categories: spraying particles, constructing pores, and creating patterns. Finally, we identify future challenges and opportunities in superhydrophobic radiative coolers, intending to push the technology toward practical applications.

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Section: Discussionmentioning

confidence: 99%

“…For instance, water droplets can be used as pore templates and then removed through heating to create pores with controlled sizes. 29 Third, it is suitable for versatile applications. Dew harvesting is a promising strategy for collecting fresh water from the atmosphere to address a global water shortage.…”

Section: ■ Conclusion and Perspectivesmentioning

confidence: 99%

Superhydrophobic Designs for Durable Radiative Cooling

Zhong,

Gao,

Wang

2024

Langmuir

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“…Previous studies have made impressive progress (CaF 2 /VO 2 core-shell microspheres (Δε = 0.36) 25 , pigments-VO 2 -PE-Al (Δε = 0.6) 26 , VO 2 -BaF 2 -Ag (Δε = 0.7) 27 ), whereas these coatings show a temperature increase and hindering effective dissipation of radiant heat 28 because of a very high solar absorptivity when exposed to direct solar radiation. To enhance solar re ectance, multilayered structures were developed using a metal-lm underneath 29,30 , a thick (∼300-500 µm) loose porous lm as overlayer [31][32][33][34] , or an overlayer with a dense inorganic nanoparticle composite lm (Al 2 O 3 35 , SiO 2 36 , TiO 2 , MgO 37 ). Alternatively, these coatings not only meet the criteria for high solar re ectance but also results in high infrared absorption in the atmospheric transparency window.…”

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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Flexible Photonic Radiative Cooling Films: Fundamentals, Fabrication and Applications

Xie

Xiao

Sun

et al. 2023

Adv Funct Materials

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Photonic structures designed at sub‐wavelength scales have emerged as a promising avenue for various energy applications, including cooling devices, water harvesting, photovoltaics, and personal thermal management, which have significantly transformed the global energy landscape. Particularly, flexible photonic radiative cooling films, which facilitate heat dissipation from surfaces by emitting it into outer space via infrared radiation, have achieved great progress in recent years. In this review, the different approaches used to design photonic structures for manipulating solar reflectance and optimizing thermal emittance are summarized. On this basis, this review discusses advancements in flexible radiative cooling films that have been meticulously adhere to these design principles, alongside their cooling effects over recent years. Furthermore, a comprehensive overview of the progress is presented in the photonic integration with new functionality and the fabrication techniques of photonic structures. Lastly, this review highlights the remarkable potential of radiative coolers in various fields. In prospect, the widespread adoption of flexible photonic radiative cooling films holds immense promise for diverse applications.

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Eco-friendly preparation of durable superhydrophobic porous film for daytime radiative cooling

Cited by 14 publications

References 72 publications

Superhydrophobic Designs for Durable Radiative Cooling

Superhydrophobic Designs for Durable Radiative Cooling

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

Flexible Photonic Radiative Cooling Films: Fundamentals, Fabrication and Applications

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