Comprehensive evaluation and analysis of a porous polymer coating for highly efficient passive radiative cooling

Gao, Yongfeng; Song, Xihao; Zhang, Peng

doi:10.1016/j.solmat.2022.112081

Cited by 30 publications

(2 citation statements)

References 40 publications

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“…At this point, superhydrophobic materials with self-cleaning properties raised concerns. Polymeric materials such as poly(dimethylsiloxane) (PDMS), − PVDF, , P(VDF–HFP), − and so on not only provide superhydrophobic interfaces with low surface energy but also exhibit excellent RC performance. Xue et al used phase separation technology to prepare SiO 2 /P(VDF–HFP)-based superhydrophobic RC composite membranes.…”

Section: Introductionmentioning

confidence: 99%

Durable Self-Cleaning Radiative Cooling Coatings for Building Energy Efficiency

Ju,

Long,

Yang

et al. 2024

ACS Appl. Mater. Interfaces

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Section: Introductionmentioning

confidence: 99%

Durable Self-Cleaning Radiative Cooling Coatings for Building Energy Efficiency

Ju,

Long,

Yang

et al. 2024

ACS Appl. Mater. Interfaces

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“…A micro-structured polyethylene film fabricated through a scalable hot embossing lithography (named HELPE), enabling good superhydrophobic properties and, therefore, excellent self-cleaning performance as a universal protective layer for most PDRC materials, has been manufactured and tested against standard polyvinyl diene fluoride (PVDF) and PVDF + PE thin films [30]. Another attempt has been made using a nanoporous PE film that presents a temperature drop with respect to the ambient temperature but measuring the ambient temperature in a micro-environment close to the samples [31].…”

Section: Introductionmentioning

confidence: 99%

Radiative cooling performance of a modified paint formulation with an integrated UV and convection shielding layer

Lio,

Levorin,

Erdogan

et al. 2024

Preprint

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Passive radiative cooling (PRC) technology promises to reduce a significant fraction of our energy needs and carbon footprint associated with cooling. Among different approaches, paint-like systems present several advantages in cost-effectiveness, scalability, and application ease. We report on a PRC system consisting of a paint mixture modified with 50 %wt glass bubbles and a top polypropylene-polyethylene-polypropylene (PP-PE-PP) film typically used as a battery separator. The resulting material exhibits a solar reflectance of 94 % and an absorption (evaluated by Attenuated Total Reflectance spectroscopy) with a peak at 10 µm of 60 %. The addition of the glass bubbles and the top film increases the paint reflectance over the solar spectrum and the UV, thanks to the nanoporous PP-PE-PP film (NPF), while allowing most thermal radiation through, shielding from convection, and making the coating more easily washable. The material has been tested under realistic outdoor conditions, checking the different performance obtained when sticking the PP-PE-PP film directly onto the wet paint layer or by using it as a separate windshield enclosing the sample test chamber. Despite its high solar reflectance, no radiative cooling is observed with respect to ambient temperature during the peak hours (solar irradiation >500 W m −2). Below this threshold, a temperature drop of −3 °C and a cooling power exceeding 100 W m−2 is observed. Notably, even using a visibly opaque convection shield, the configuration where the PP-PE-PP film seals the sample results in a substantial overheating of the air pocket surrounding the sample , which is detrimental to obtaining a temperature drop with respect to the true ambient temperature.

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Shedding Light on the Mid‐Infrared Complex Refractive Index of Anodic Aluminum Oxide

Díaz‐Lobo,

Castro‐Fernández,

Blanco

et al. 2024

Advanced Optical Materials

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In the current scientific landscape, the understanding of optical properties in the mid‐infrared (mid‐IR) range (3–30 µm) is crucial in simulations and models to explore the potential of materials for various applications. However, due to the challenges associated with mid‐IR characterization, accurate refractive index (n) and extinction coefficient (κ) data are often lacking in the literature. This study addresses this gap by investigating the mid‐IR n and κ spectra of anodic aluminum oxide (AAO) nanostructures anodized under different conditions, using two distinct approaches: IR ellipsometry and a theoretical model based on multilayer reflection and effective medium. The results demonstrate a strong agreement: the anodizing conditions have a significant influence on the optical properties of the AAO nanostructures. These differences enable accurate simulations of the emissivity spectra of AAO nanostructures on Al foils, which align closely with experimental measurements. This theoretical approximation is versatile and extensible to a broad range of materials. Different materials are tested, namely, a sapphire, a polycarbonate film, and a polyethylene terephthalate (PET) film achieving a useful qualitative description. This study paves the way for a novel approach in the engineering of new micro and nano‐optical materials, facilitating their evaluation for suitability in mid‐IR applications.

show abstract

Comprehensive evaluation and analysis of a porous polymer coating for highly efficient passive radiative cooling

Cited by 30 publications

References 40 publications

Durable Self-Cleaning Radiative Cooling Coatings for Building Energy Efficiency

Durable Self-Cleaning Radiative Cooling Coatings for Building Energy Efficiency

Radiative cooling performance of a modified paint formulation with an integrated UV and convection shielding layer

Shedding Light on the Mid‐Infrared Complex Refractive Index of Anodic Aluminum Oxide

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