Nanoporous silica microspheres–ploymethylpentene (TPX) hybrid films toward effective daytime radiative cooling

Yang, Jie; Gao, Xiangdong; Wu, Yusong; Zhang, Tongtong; Zeng, Huarong; Li, Xiaomin

doi:10.1016/j.solmat.2019.110301

Cited by 45 publications

(17 citation statements)

References 31 publications

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“…Furthermore, whereas IR selective emitters have been fabricated using a wide range of materials, the choice of materials for IR-selective transparent covers remains limited. Specifically, active emitting materials include PDMS, , other polymers (e.g., TPX, , P(Vdf-HFP), , PET/ECDL pairs with ECDEL, , and cellulose , ), oxides (e.g., alumina, silicon dioxide, − silicon dioxide embedded in polyamide nanofibers, hafnium dioxide), phosphates, nitrides, carbides, alternating germanium and aluminum layers, and various paint formulations. , In contrast, IR selective covers rely predominantly on conventional IR window materials such as chalcogenides , and PE ,− . In particular, recent approaches have focused on porous PE. ,,, The simple chemistry of PE (C 2 H 4 ) n means that absorption peaks only occur for C–H and C–C bonds, resulting in high transmission in the IR.…”

Section: Introductionmentioning

confidence: 99%

Selectively Enhancing Solar Scattering for Direct Radiative Cooling through Control of Polymer Nanofiber Morphology

Kim

McSherry

Brown

et al. 2020

ACS Appl. Mater. Interfaces

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Radiative cooling can alleviate urban heat island effects and passively improve personal thermal comfort. Among many emerging approaches, infrared (IR) transparent films and fabrics are promising because they can allow objects to directly radiate heat through bands of atmospheric transparency while blocking solar heating. However, achieving high solar reflectance while maintaining IR transmittance using scalable nanostructured materials requires control over the shape and size distribution of the nanoscale building blocks. Here, we investigate the scattering and transmission properties of electrospun polyacrylonitrile (PAN) nanofibers that feature spherical, ellipsoidal, and cylindrical morphologies. We find that nanofibers that have ellipsoidal beads exhibit the most efficient solar scattering, mainly due to the additive dielectric resonances of the ellipsoidal and cylindrical geometries, as confirmed through electromagnetic simulations. This favorable scattering decreases the amount of material needed to reach above 95% solar reflectance, which, in turn, enables high infrared transmittance (>70%) despite PAN's intrinsic IR absorption. We further show that these PAN nanofibers (nanoPAN) can enable cooling of surfaces with relatively low solar reflectance, which is demonstrated by covering a reference blackbody surface with beaded nanoPAN. During peak solar hours, this configuration lowers the temperature of the black surface by approximately 50 °C and is able to achieve as low as 3 °C below the ambient air temperature. More broadly, our demonstration using PAN, which is not as IR transparent as more commonly used polyethylene, provides a method for utilizing lower purity materials in radiative cooling.

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Section: Introductionmentioning

confidence: 99%

Selectively Enhancing Solar Scattering for Direct Radiative Cooling through Control of Polymer Nanofiber Morphology

Kim

McSherry

Brown

et al. 2020

ACS Appl. Mater. Interfaces

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“…This work has inspired some other studies on the application of metamaterials based on random particles in radiative cooling, which are easy to manufacture and usually possess flexibility obtained from polymers. [61][62][63]…”

Section: Metamaterial-based Radiative Coolingmentioning

confidence: 99%

Progress in Metafibers for Sustainable Radiative Cooling and Prospects of Achieving Thermally Drawn Metafibers

Miao

Wang

et al. 2021

Adv Energy and Sustain Res

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The growing awareness of the energy crisis and global warming has inspired researchers to pursue alternative cooling strategies. Radiative cooling is an environmentally friendly approach that dissipates excessive heat through the atmospheric long‐wave infrared transmission window (8–13 μm) to the cold universe. Metamaterials with unique photonic structures are applicable to radiative cooling and have been extensively studied. Incorporating meta‐elements to the fiber level of the fabric to construct metafibers is expected to achieve personal thermal management through radiative cooling. Compared with the conventional fiber manufacturing methods, the thermal drawing technique can mass‐produce multimaterial and multifunctional fibers with well‐defined structures. These in‐fiber micro‐ and nanostructures of light wavelength scale possess great potentials in radiative cooling applications, providing bright prospects for a new generation of metafiber‐based smart fabrics. Herein, the fundamental principles of radiative cooling and the metamaterials being used for radiative cooling are summarized. The textiles used for personal cooling and their preparation methods are also introduced. Finally, the article focuses on the preparation of micro‐ and nanostructures by the thermal drawing technique, which provides a potential solution for the large‐scale manufacture of metafibers for sustainable radiative cooling.

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“…and substrates (Ag, Al, etc.) and thus achieve radiative cooling. − Compared with metamaterials and photonic crystals, it is more suitable for large-scale applications and is a key research area in radiative cooling nowadays.…”

Section: Introductionmentioning

confidence: 99%

In Situ Formation of SiO₂ Nanospheres on Common Fabrics for Broadband Radiative Cooling

Zhang

2021

ACS Appl. Nano Mater.

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Radiative cooling materials are attracting more and more attention because of their intrinsic advantages in energy saving and environmental protection, especially radiative cooling fabrics. In this paper, we used tetraethyl orthosilicate (TEOS) as the silicon source and prepared radiative cooling fabrics by in situ synthesizing SiO 2 microspheres on polyester cloth. The in situ formation of SiO 2 microspheres results in strong bonding with polyester fibers, solving the problem of powder peeling. The fabrics we prepared have a high emissivity of more than 95% in the midinfrared band and a relatively high reflectivity of ∼70% in the visible−near infrared band and can realize effective radiative cooling. The cooling effect would vary with the amount of TEOS added, and the sample with the optimal performance could achieve a maximal temperature drop of 11.2 °C under direct sunlight (10:00 a.m. to 16:00 p.m.) when compared with the surrounding environment. Such cooling fabrics can be made from commonly used fabrics on a large area, suggesting their potential use in fields such as outdoor cooling clothing and refrigerated shipments and thus opened up a way for the preparation and application of radiative cooling fabrics.

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Nanoporous silica microspheres–ploymethylpentene (TPX) hybrid films toward effective daytime radiative cooling

Cited by 45 publications

References 31 publications

Selectively Enhancing Solar Scattering for Direct Radiative Cooling through Control of Polymer Nanofiber Morphology

Selectively Enhancing Solar Scattering for Direct Radiative Cooling through Control of Polymer Nanofiber Morphology

Progress in Metafibers for Sustainable Radiative Cooling and Prospects of Achieving Thermally Drawn Metafibers

In Situ Formation of SiO₂ Nanospheres on Common Fabrics for Broadband Radiative Cooling

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Nanoporous silica microspheres–ploymethylpentene (TPX) hybrid films toward effective daytime radiative cooling

Cited by 45 publications

References 31 publications

Selectively Enhancing Solar Scattering for Direct Radiative Cooling through Control of Polymer Nanofiber Morphology

Selectively Enhancing Solar Scattering for Direct Radiative Cooling through Control of Polymer Nanofiber Morphology

Progress in Metafibers for Sustainable Radiative Cooling and Prospects of Achieving Thermally Drawn Metafibers

In Situ Formation of SiO2 Nanospheres on Common Fabrics for Broadband Radiative Cooling

Contact Info

Product

Resources

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In Situ Formation of SiO₂ Nanospheres on Common Fabrics for Broadband Radiative Cooling