Facile preparation of solar reflective cool colored material with desired superhydrophobicity

Qi, Yanli; Zhao, Hongshun; Ren, Yurong

doi:10.1016/j.solmat.2022.111761

Cited by 7 publications

(6 citation statements)

References 46 publications

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“…The detailed determination method could be referred to our previous paper. 32 The reflectance (R(λ)), ranging from λ 1 to λ 2 , was collected by applying an UV−VIS−NIR spectrophotometer (UV-3101PC, Shimadzu, Tokyo, Japan) equipped with an integrating sphere, according to ASTM G173. The reflectance determination method is expressed below 26 Herein, the reflectance in the wavelength ranging from 280 to 400 nm is defined as the reflectance in UV region (R UV ), while the reflectance in the wavelength ranging from 400 to 700 nm is defined as the reflectance in the VIS region (R VIS ).…”

Section: Methodsmentioning

confidence: 99%

“…Recently, quite a few studies try to investigate next-generation passive radiative cooling materials with functional features, such as superhydrophobicity, self-cleaning property, anti-icing performance, weather-resistance, and so on. ,,, The reported polymer-based passive radiative cooling materials include poly(vinylidene fluoride- co -hexafluoropropene), , polyethylene terephthalate, cellulose acetate, polydimethylsiloxane, polymethylpentene, etc., , which cannot be degraded by bacteria after exceeding service life. In our previous work, acrylonitrile-styrene-acrylate was applied to prepare passive radiative cooling materials for its excellent weather-resistance, whereas it still cannot be degraded. , There is no way to better deal with these above-mentioned polymers except landfill and recycling.…”

Section: Introductionmentioning

confidence: 99%

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Flexible and Degradable Poly(Vinyl Alcohol)-Based Film for Passive Cooling Applications

Qi,

Yan,

Qin

et al. 2024

ACS Appl. Polym. Mater.

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Passive radiative cooling materials with high solar reflectance efficiently alleviate the problem of the greenhouse effect and global warming through less heat accumulation, while environmentally friendly and degradable properties are desired because of human environmental awareness. However, sustainable passive radiative cooling materials have not been extensively studied. Herein, degradable and water-soluble poly(vinyl alcohol) (PVA) was applied as the polymer-matrix, and then, it would ultimately degrade into water and carbon dioxide at the end of life. Meanwhile, titanium dioxide (TiO2) with nano- and micron-scale particle sizes was utilized to investigate the effect of their simultaneous application on solar reflectance and cooling property for high efficiency. In the present study, the eco-friendly film was prepared via the casting method. As a result, the simultaneous application of 3 wt % nano- and 7 wt % micron-scale TiO2 contributes to the higher visible light reflectance (R VIS) of 81.3%, near-infrared light reflectivity (R NIR) of 66.0%, and solar reflectance (R S) of 70.6%. Simultaneously, the thermal emissivity at the atmospheric window (8–13 μm) reaches to the value of 0.96, while the solar reflectance index values are higher than 87. Compared with PVA, this white film presents cooling capability, approximately reaching 20 °C below the ambient temperature. Thus, this passive radiative cooling film with high solar reflectance and high thermal emissivity presents advantages in energy savings and maintains sustainable development, which can be applied in the field of foldable sunshade materials for sunroom or windows.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flexible and Degradable Poly(Vinyl Alcohol)-Based Film for Passive Cooling Applications

Qi,

Yan,

Qin

et al. 2024

ACS Appl. Polym. Mater.

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“…Furthermore, most of the colorant‐based cooling materials are in the form of coatings that need to be coated twice on extra substrates, or need an additional metal‐reflective layer, which lack flexibility. [ 10,23,30 ]…”

Section: Introductionmentioning

confidence: 99%

“…The pigmentary color strategy directly applies colorant on the PDRC materials, which has the advantage of easy preparation, and low-cost and large-scale production. [22,23] Unfortunately, incorporation of colorants inevitably causes absorption across the solar spectrum, counteracting the cooling effect. An alternative method is incorporating photoluminescent colorants to decrease the light-to-heat conversion, [24][25][26][27][28][29] but the color intensity is closely related to the quantum yield of the colorant.…”

mentioning

confidence: 99%

“…Furthermore, most of the colorant-based cooling materials are in the form of coatings that need to be coated twice on extra substrates, or need an additional metal-reflective layer, which lack flexibility. [10,23,30] The key issue to design effective colored PDRC material is to lower the unnecessary solar absorption and improve emission across the atmospheric transparent window. [31,32] Hierarchically porous materials with light-scatting air voids have excellent solar reflectivity, [7,[33][34][35] and randomly packed SiO 2 with…”

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confidence: 99%

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Flexible and Dual‐Sided Available Colored Films for Efficient Daytime Radiative Cooling

Zhang

Pan

et al. 2023

Adv Eng Mater

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Passive daytime radiative cooling (PDRC) is a promising strategy to realize surface cooling of objects without any external energy consumption. While such materials typically exhibit dazzling white appearances, developing pleasingly looking colored radiative cooling materials is greatly significant but remains an arduous challenge. Herein, self‐standing, flexible colored films available on both sides are prepared by using a facile and scalable strategy. The films are asymmetrically designed. One side is SiO2‐filled porous structure with highly reflective pigment distributed that can selectively reflect solar light to generate specific color, and the other side is hierarchically porous three‐phase composite with less SiO2, which maximizes the solar reflection. The breathable film achieves a relatively high near infrared reflectance on the colored side (up to 89%), and a broadband solar reflectance on the reverse side. Moreover, both sides exhibit extremely high mid‐infrared emissivity (98%) allowing significant radiative heat loss. With the diverse but efficient reflectance and emittance, different sides of three colored films yield temperature drops ranging from 2.0 to 11.1 °C during daytime. Building energy simulation indicates that 655 MJ m−2 energy can be saved over the whole summer if the dual‐sided available colored film is deployed in China.

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Scalable-manufactured and mechanical-robust superhydrophobic hierarchical material toward self-cleaning passive cooling

Sun,

Yang,

Chen

et al. 2023

Composites Part A: Applied Science and Manufacturing

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Facile preparation of solar reflective cool colored material with desired superhydrophobicity

Cited by 7 publications

References 46 publications

Flexible and Degradable Poly(Vinyl Alcohol)-Based Film for Passive Cooling Applications

Flexible and Degradable Poly(Vinyl Alcohol)-Based Film for Passive Cooling Applications

Flexible and Dual‐Sided Available Colored Films for Efficient Daytime Radiative Cooling

Scalable-manufactured and mechanical-robust superhydrophobic hierarchical material toward self-cleaning passive cooling

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