Anisotropic porous designed polymer coatings for high-performance passive all-day radiative cooling

Zhu, Jiliang; An, Zhiqiang; Zhang, Anxun; Zhou, Yike Du Xuan; Geng, Yi-Zhao; Chen, Guifeng

doi:10.1016/j.isci.2022.104126

Cited by 18 publications

(16 citation statements)

References 36 publications

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“…During the phase separation process, the solvent DMAC and the non-solvent normalH2O are continuously exchanged when the glass mold containing the mixed solution is immersed in deionized water, DMAC comes out of the mixed system and normalH2O enters the mixed system from outside. The amount of DMAC in the system will become less and less, while the amount of normalH2O will become higher and higher 18 . As the solvent DMAC has good mutual solubility with water, the solvent and non-solvent produce double diffusion perpendicular to the film surface during the phase change 19 .…”

Section: Resultsmentioning

confidence: 99%

“…We prepared P-PVDF films using the same solvent-nonsolvent phase separation method as in some previous work. The labor cost is roughly the same as the previous work, 13,15,18 and there is only a difference in the cost of raw materials. Therefore, we only consider the cost of raw materials when calculating the cost of P-PVDF films.…”

Section: Surface Morphology and Structural Characteristicsmentioning

confidence: 98%

“…The amount of DMAC in the system will become less and less, while the amount of H 2 O will become higher and higher. 18 As the solvent DMAC has good mutual solubility with water, the solvent and non-solvent produce double diffusion perpendicular to the film surface during the phase change. 19 In contrast, water is insoluble with PVDF, and water droplets entering the polymer form a small number of air pores after drying.…”

Section: Materials Characterizationsmentioning

confidence: 99%

See 2 more Smart Citations

Low-cost and scalable sub-ambient radiative cooling porous films

Cao

Song

et al. 2023

J. Photon. Energy

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Passive radiative cooling is an environmentally friendly and energy-free cooling method, but the practical application of radiative cooling materials is still limited by high costs and cumbersome preparation processes. Here, low-cost and chemically stable polyvinylidene fluoride (PVDF) was selected as the raw material and porous P-PVDF films for daytime radiative cooling were prepared by a simple phase separation method. A solar reflectivity of 95.6% and an atmospheric window emissivity of 99.1% were obtained, resulting in high-performance radiative cooling without a metal reflective layer. A cooling power of 69.43 W • m −2 was achieved in direct sunlight, achieving sub-ambient cooling of 4.2°C. This work provides a unique solution for radiative cooling materials, which is expected to be implemented in practical applications of passive radiative cooling.

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Section: Resultsmentioning

confidence: 99%

Section: Surface Morphology and Structural Characteristicsmentioning

confidence: 98%

Section: Materials Characterizationsmentioning

confidence: 99%

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Low-cost and scalable sub-ambient radiative cooling porous films

Cao

Song

et al. 2023

J. Photon. Energy

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“…Inspired by the work above, another P(VdF-HFP) porous membrane with a porosity larger than 60% was prepared in deionized water by a phase separation method, achieving a solar reflectance of 92% and an atmospheric window emissivity of 96%. 60 Further improvements on this preparation strategy have been proposed, mainly to improve the control over the structure formation and its porosity distribution. Since the volatilization of solvent is accompanied by the movement of the molecular chain, the thickness of the film is poorly controlled, which will affect the stability of its reflectivity.…”

Section: Development Of Single-polymer Radiative Cooling Materialsmentioning

confidence: 99%

Recent progress in organic-based radiative cooling materials: fabrication methods and thermal management properties

Ding

Kong

et al. 2023

Mater. Adv.

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“…In pursuit of decarbonization of cooling, one well proven solution is to reduce the transmittance and absorbance of sunlight (0.380–2.5 μm), − and simultaneously increase heat dissipation by emitting long wavelength infrared light (LWIR, 8–13 μm), − viz . a daytime passive radiation cooling (DPRC) mechanism. − To accomplish superior cooling performance for a DPC membrane, prevalent design tenet focuses on tuning pore morphology that can strongly backscatter the incident sunlight. − …”

Section: Introductionmentioning

confidence: 99%

Arrested Phase Separation Enables Optimal Light Management toward High-Performance Passive Radiative Cooling Film

Qin

Lin

Liang

et al. 2023

Ind. Eng. Chem. Res.

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Daytime passive radiative cooling has emerged as an energy-saving cooling technique. However, market penetration of current daytime passive radiative cooling-related membranes is still miniscule due to deficiencies in scalability, recyclability, and robustness. This work successfully addresses these issues by concurrently imparting the following features in a designed polymeric cooler: (1) cost-effective and recyclable raw materials that highlight the sustainability; ( 2) scalable yet exquisite structureengineering strategy to afford superb light scattering performance;(3) malleable under facile conditions to fit complex surface conformably. Specifically, our cooling membrane is solely composed of a mass chemical, polyvinyl butyral, which forms a supramolecular network with the polymer−air interface as light scattering sites and −C−O−C− bonds as infrared emitters. The structure of the polyvinyl butyral membrane is exquisitely organized via kinetical arrest of network-forming phase separation. The spatial size, contrast, and distribution of phase domains can be finely manipulated via tuning the composition routes and depth of phase separation. The optimized membrane demonstrates all-day and all-climate cooling with a 7.3 °C subambient cooling and 62 W/m 2 cooling power. In addition to this superb cooling performance, this membrane uniquely affords a collective of multiple features, such as cost effectiveness, recyclability, and hydrophobicity.

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Anisotropic porous designed polymer coatings for high-performance passive all-day radiative cooling

Cited by 18 publications

References 36 publications

Low-cost and scalable sub-ambient radiative cooling porous films

Low-cost and scalable sub-ambient radiative cooling porous films

Recent progress in organic-based radiative cooling materials: fabrication methods and thermal management properties

Arrested Phase Separation Enables Optimal Light Management toward High-Performance Passive Radiative Cooling Film

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