Self-assembling hierarchical flexible cellulose films assisted by electrostatic field for passive daytime radiative cooling

Zhong, Shenjie; Zhang, Jiawen; Yuan, Shuaixia; Xu, Tian-Qi; Zhang, Xun; Xu, Lang; Zuo, Tian; Cai, Yingjie; Yi, Lingmin

doi:10.1016/j.cej.2022.138558

Cited by 39 publications

(29 citation statements)

References 38 publications

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“…We further characterized the spectroscopic performance of WBC-50 in the infrared region (Figure c). It exhibited a high emissivity ∼96% between 8 and 13 μm, which was comparable to those of other excellent radiative cooling materials. − The high infrared emissivity of WBC-50 was mainly achieved by the molecular vibration and stretching of hydroxyl groups of cellulose, as well as the strong emission of C–H, C–O, and C–O–C at 980–1200 cm –1 , located in the infrared atmospheric window . Moreover, the presence of inorganic components in WBCs helped to form pores that facilitated the scattering of sunlight .…”

Section: Resultsmentioning

confidence: 72%

“…56−58 The high infrared emissivity of WBC-50 was mainly achieved by the molecular vibration and stretching of hydroxyl groups of cellulose, as well as the strong emission of C−H, C−O, and C−O−C at 980−1200 cm −1 , located in the infrared atmospheric window. 58 Moreover, the presence of inorganic components in WBCs helped to form pores that facilitated the scattering of sunlight. 59 The high solar reflectance and high mid-infrared emissivity of WBCs enabled them to possess excellent cooling performance.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Composition Regulation of Free Delignification of Wood Powder toward High Performance, Recyclable Composites

Fang

Shi

Wang

et al. 2022

ACS Sustainable Chem. Eng.

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Wood-based structural materials have already shown great potential in engineering applications. However, the current research usually has been requiring partial removal of lignin and hemicellulose from wood, and the chemicals used in this process have been harmful to the environment and humans. In this study, a novel addition strategy without the delignification process was reported to design wood-based structural materials. Bacterial cellulose as a green binder and composition regulator was added into wood powder aqueous dispersion to form a wood powder− bacterial cellulose slurry. Superior mechanical properties, excellent water and thermal stability, and recyclability were achieved in this wood powder/bacterial cellulose composite. Furthermore, the composite exhibited pronounced flame retardancy due to the presence of inorganic salt components (calcium and magnesium carbonates). The wood modification strategy without delignification provides a new direction for the production of biodegradable and sustainable wood-based composites as a healthier alternative to petrochemical plastics.

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Section: Resultsmentioning

confidence: 72%

Section: ■ Results and Discussionmentioning

confidence: 99%

Composition Regulation of Free Delignification of Wood Powder toward High Performance, Recyclable Composites

Fang

Shi

Wang

et al. 2022

ACS Sustainable Chem. Eng.

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“…The high crystallinity of HSCA is owing to the self-assembly of cellulose macromolecules assisted by a high-voltage electrostatic field. 32 So, as can be seen in the magnified image of Figure 2b, the nanofibers combined in the network of HSCA are crystalline cellulose fibrils, which can further reinforce the mechanical properties of HSCA. This also confirms that the "electrostatic assembly" of cellulose macromolecules occurs at a molecular level with the formation of a large number of cellulose nanocrystals.…”

Section: ■ Results and Discussionmentioning

confidence: 83%

Hierarchical Cellulose Aerogel Reinforced with In Situ-Assembled Cellulose Nanofibers for Building Cooling

Zhong

Yuan

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

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The development of new structural materials for passive daytime radiative cooling (PDRC) of buildings will significantly reduce global building energy consumption. Cellulose aerogels are potential PDRC materials for building cooling, but the cooling performance and mechanical strength of cellulose aerogels are considered as challenges for their practical applications. Herein, a bio-inspired hierarchically structured cellulose aerogel (HSCA) was fabricated through an assembly strategy assisted by a high-voltage electrostatic field. The HSCA possesses outstanding PDRC performance and moderate mechanical strength owing to aligned hierarchical porous network microstructures reinforced with in situ-assembled crystalline cellulose nanofibers. Promisingly, the HSCA achieves a max cooling temperature of 7.2 °C and exhibits 1.9 MPa axial compressive strength. There was no significant cooling performance degradation after the hydrophobically modified HSCA was placed outdoors for 3 months. A simulation of potential cooling energy savings shows that by using HSCA as the building envelopes (side wall and roof), it can save 52.7% of cooling energy compared to the building baseline consumption. This new strategy opens up the possibility of developing advanced functionally regenerated cellulose aerogel, which is expected to provide a revolutionary improvement in aerogel materials for building cooling.

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“…Among various cooling technologies, radiative cooling without consuming energy or releasing greenhouse gas is an attractive way for passive heat dissipation. − In particular, subambient daytime radiative cooling materials and technologies in recent years have received intensive research attention. − The outstanding radiative cooling capability of particular biological species such as Sahara silver ant and longicorn beetle has inspired the judicious selection of engineering materials and innovative microstructure design to continuously improve the performances of man-made radiative cooling devices and systems. − …”

Section: Bioinspired Thermal Energy Regulationmentioning

confidence: 99%

Biological and Bioinspired Thermal Energy Regulation and Utilization

Shi

Jiang

et al. 2023

Chem. Rev.

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The regulation and utilization of thermal energy is increasingly important in modern society due to the growing demand for heating and cooling in applications ranging from buildings, to cooling high power electronics, and from personal thermal management to the pursuit of renewable thermal energy technologies. Over billions of years of natural selection, biological organisms have evolved unique mechanisms and delicate structures for efficient and intelligent regulation and utilization of thermal energy. These structures also provide inspiration for developing advanced thermal engineering materials and systems with extraordinary performance. In this review, we summarize research progress in biological and bioinspired thermal energy materials and technologies, including thermal regulation through insulation, radiative cooling, evaporative cooling and camouflage, and conversion and utilization of thermal energy from solar thermal radiation and biological bodies for vapor/electricity generation, temperature/infrared sensing, and communication. Emphasis is placed on introducing bioinspired principles, identifying key bioinspired structures, revealing structure–property–function relationships, and discussing promising and implementable bioinspired strategies. We also present perspectives on current challenges and outlook for future research directions. We anticipate that this review will stimulate further in-depth research in biological and bioinspired thermal energy materials and technologies, and help accelerate the growth of this emerging field.

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Self-assembling hierarchical flexible cellulose films assisted by electrostatic field for passive daytime radiative cooling

Cited by 39 publications

References 38 publications

Composition Regulation of Free Delignification of Wood Powder toward High Performance, Recyclable Composites

Composition Regulation of Free Delignification of Wood Powder toward High Performance, Recyclable Composites

Hierarchical Cellulose Aerogel Reinforced with In Situ-Assembled Cellulose Nanofibers for Building Cooling

Biological and Bioinspired Thermal Energy Regulation and Utilization

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