A hierarchically structured self-cleaning energy-free polymer film for daytime radiative cooling

Huang, Meng-Chen; Xue, Chao-Hua; Huang, Jianying; Liu, Bing-Ying; Guo, Xiao-Jing; Bai, Zhongxue; Wei, Ren-Xuan; Wang, Hui-Di; Du, Mi-Mi; She, Jia; Chen, Zhong; Lai, Yuekun

doi:10.1016/j.cej.2022.136239

Cited by 92 publications

(50 citation statements)

References 46 publications

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“…It is significant for the radiative cooling materials to protect the surface properties. Endowing a material with superhydrophobicity is a good way to prevent the surface from contamination . It was found that the PS/PDMS/PECA coating could not be stained by mud slurry and maintained the original white appearance due to the superhydrophobic self-cleaning property (Figure a).…”

Section: Resultsmentioning

confidence: 99%

“…Endowing a material with superhydrophobicity is a good way to prevent the surface from contamination. 52 It was found that the PS/ PDMS/PECA coating could not be stained by mud slurry and maintained the original white appearance due to the superhydrophobic self-cleaning property (Figure 7a). However, the mud slurry adhered on the TiO 2 coating and stained the sample (Figure 7b), which made the temperature of the TiO 2 coating increase from 44.6 to 55.8 °C, 12.5 °C higher than that of the air (Figure 7c,d).…”

Section: ■ Introductionmentioning

confidence: 99%

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Superhydrophobic Porous Coating of Polymer Composite for Scalable and Durable Daytime Radiative Cooling

Wang

Xue

et al. 2022

ACS Appl. Mater. Interfaces

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Passive daytime radiative cooling (PDRC) technology provides an eco-friendly cooling strategy by reflecting sunlight reaching the surface and radiating heat underneath to the outer space through the atmospheric transparency window. However, PDRC materials face challenges in cooling performance degradation caused by outdoor contamination and requirements of easy fabrication approaches for scale-up and high cooling efficiency. Herein, a polymer composite coating of polystyrene, polydimethylsiloxane and poly(ethyl cyanoacrylate) (PS/PDMS/PECA) with superhydrophobicity and radiative cooling performance was fabricated and demonstrated to have sustained radiative cooling capability, utilizing the superhydrophobic self-cleaning property to maintain the optical properties of the coating surface. The prepared coating is hierarchically porous which exhibits an average solar reflectance of 96% with an average emissivity of 95% and superhydrophobicity with a contact angle of 160°. The coating realized a subambient radiative cooling of 12.9 °C in sealed air and 7.5 °C in open air. The self-cleaning property of the PS/PDMS/PECA coating helped sustain the cooling capacity for long-term outdoor applications. Moreover, the coating exhibited chemical resistance, UV resistance, and mechanical durability, which has promising applications in wider fields.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Superhydrophobic Porous Coating of Polymer Composite for Scalable and Durable Daytime Radiative Cooling

Wang

Xue

et al. 2022

ACS Appl. Mater. Interfaces

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“…As UVvis-NIR spectra shown in Fig. 16b, the high porosity and white appearance of Si-CNF/BNNS aerogel (2 mm thick) ensure a higher solar re ectivity than CNF aerogel over the entire solar spectral range from 0.3 to 2.5 µm (Huang et al 2022b). The combination of excellent thermal insulation performance and superior passive radiative cooling capability in aerogel shows a bright prospect for reducing building energy consumption in future.…”

Section: Thermal Management Of the Anisotropic Si-cnf/bnns Aerogelmentioning

confidence: 93%

Directional fabricating of flexible and compressible cellulose nanofibril composite aerogel with excellent thermal insulation, flame-retardancy and radiative cooling for efficient thermal management

Zhao

Zhou

et al. 2022

Preprint

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In order to reduce the thermal discomfort and fire accidents caused by overheating of electronics and high temperature of buildings, high-performance thermal insulation and fire-resistant materials are urgently desirable. Cellulose nanofiber aerogel derived from regenerative resources holds wide promise in the field of thermal insulation, but its inherent flammability, poor mechanical strength and water resistance make it face great challenges in practical application. Herein, a lightweight, porous, anisotropic silylated cellulose nanofiber/hydroxylated boron nitride nanosheet (Si-CNF/BNNS) composite aerogel was prepared by unidirectional freeze-casting technique. Attributed to the aligned structure, Si-CNF/BNNS aerogel was robust axially and compressible radially. The thermal conductivity of aerogel was 0.0621 W·m−1·K−1 in the axial direction and 0.0339 W·m−1·K−1 in the radial direction, demonstrating an anisotropic thermal insulation performance. In addition, aerogel also exhibited excellent flame retardant, hydrophobic and radiative cooling properties, as evidenced by extremely low peak heat release rate of 14.05 kW/m2, water contact angle of 136.6° and high solar reflectivity. This high-performance anisotropic Si-CNF/BNNS aerogel is promising in improving thermal comfort and environmental safety, showing its great potential in electronic packaging and energy efficient buildings.

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“…Confronting the decreased radiative-cooling performance from outdoor contamination, Huang et al [138] adopted a phase separation process to fabricate polyvinylidene fluoride and polydimethylsiloxane porous film with hierarchical structure and superhydrophobic property. Owing to the molecular vibrational modes of PVDF/ PDMS and the enhancement of the Mie scattering, the as-prepared film exhibited a high reflectance of 97% in Vis-NIR range and a high MIR emissivity of 96%, thereby yielding excellent cooling performance as average temperature drop of 12.3 ℃ in direct sunlight.…”

Section: Hierarchically Structurementioning

confidence: 99%

Bioinspired Materials: From Distinct Dimensional Architecture to Thermal Regulation Properties

et al. 2022

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The structural evolutions of the organisms during the development of billions of years endow them with remarkable thermal-regulation properties, which have significance to their survival against the outer versatile environment. Inspired by the nature, there have been extensive researches to develop thermoregulating materials by mimicking and utilizing the advantages from the natural organisms. In this review, the latest advances in thermal regulation of bioinspired microstructures are summarized, classifying the researches from dimension. The representative materials are described with emphasis on the relationship between the structural features and the corresponding thermal-regulation functions. For one-dimensional materials, wild silkworm cocoon fibers have been involved, and the reasons for unique optical phenomena have been discussed. Pyramid cone structure, grating and multilayer film structure are chosen as typical examples of two-dimensional bionics. The excellent thermal performance of the three-dimensional network frame structures is the focus. Finally, a summary and outlook are given.

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A hierarchically structured self-cleaning energy-free polymer film for daytime radiative cooling

Cited by 92 publications

References 46 publications

Superhydrophobic Porous Coating of Polymer Composite for Scalable and Durable Daytime Radiative Cooling

Superhydrophobic Porous Coating of Polymer Composite for Scalable and Durable Daytime Radiative Cooling

Directional fabricating of flexible and compressible cellulose nanofibril composite aerogel with excellent thermal insulation, flame-retardancy and radiative cooling for efficient thermal management

Bioinspired Materials: From Distinct Dimensional Architecture to Thermal Regulation Properties

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