Infrared-Radiation-Enhanced Nanofiber Membrane for Sky Radiative Cooling of the Human Body

Xiao, Runcai; Hou, Chengyi; Yang, Weifeng; Su, Yun; Li, Yaogang; Zhang, Qinghong; Gao, Peng; Wang, Hongzhi

doi:10.1021/acsami.9b13933

Cited by 106 publications

(77 citation statements)

References 32 publications

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“…More importantly, the phonon‐polariton resonances of dielectric microspheres with 8 µm diameter lead to a strong emissivity in the mid‐infrared ray (MIR). Wang and co‐workers [ 36 ] designed SiO 2 spheres with sub‐micrometer sizes and random distributions into polyamide 6 nanofibers, enabling a high mid‐IR emittance and enhancing radiative cooling performance. It was revealed that cooling materials possess air permeability and thermal‐moisture comfortability.…”

Section: Development Of Advanced Pdrc Devicesmentioning

confidence: 99%

Recent Progress in Daytime Radiative Cooling: Advanced Material Designs and Applications

Zhang

Wang

et al. 2022

Small Methods

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the terrestrial radiation with a temperature of ≈300 K at the Earth's surface is concentrated at wavelengths ranging from 2.5 to 50 µm. Meanwhile, the combined effects from all atmospheric components result in that the special atmospheric window between 8 and 13 µm that is highly transparent. Hence, most terrestrial areas can effectively radiate heat through the transparent atmospheric window to the cold universe to maintain a relatively stable temperature. To this end, radiative coolers should have high emissivity in the transparent atmospheric window (8-13 µm), which is transparent in this region and allows infrared (IR) light to pass through. In this regard, various materials and structures have been designed in the past few decades and have exhibited promising passive cooling performance at night. [8,9] However, during the daytime, the Sun heats the radiative coolers, which seriously compromises the cooling effect. To resolve this problem, the cooler should radiate more heat to the cold universe while reflecting sunlight to avoid solar heating. Fan and co-workers [10] first designed multilayer photonic materials and achieved daytime radiative cooling to a temperature below ambient conditions when subjected to direct sunlight. Since then, various materials have been demonstrated to realize subambient daytime radiative cooling and have shown great potential for practical applications. [11][12][13] Before some reviews have summarized these developments in radiative cooling, [14][15][16][17] but the limited net cooling power and instability of radiative cooling hinder its practical wide applications. In this review, by summarizing the state-of-the-art research and development in passive daytime radiative cooling (PDRC), we first propose three critical components for PDRC: 1) spectral design in the mid-IR range, 2) structure design for enhancing solar reflectance, and 3) thermal management. Second, we introduce various applications of PDRC, such as building cooling, solar cell cooling, water harvesting, clothing, and electricity generation (Figure 1). Finally, the remaining challenges and opportunities of PDRCs are also discussed. Fundamental Mechanisms of PDRC PDRC ConceptBased on Kirchhoff's law, an object with a temperature higher than 0 K continuously exchanges heat with other objects by absorbing Passive daytime radiative cooling (PDRC) is emerging as a promising cooling technology. Owing to the high, broadband solar reflectivity and high mid-infrared emissivity, daytime radiative cooling materials can achieve passive net cooling power under direct sunlight. The zero-energy-consumption characteristic enables PDRC to reduce negative environmental issues compared with conventional cooling systems. In this review, the development of advanced daytime radiative cooling designs is summarized, recent progress is highlighted, and potential correlated applications, such as building cooling, photovoltaic cooling, and electricity generation, are introduced. The remaining challenges and opportunities of PDRCs are also in...

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Section: Development Of Advanced Pdrc Devicesmentioning

confidence: 99%

Recent Progress in Daytime Radiative Cooling: Advanced Material Designs and Applications

Zhang

Wang

et al. 2022

Small Methods

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“…Cellulose is an abundant forest-based material with attractive sustainable properties such as biodegradability, biocompatibility and nontoxicity. This makes cellulose-based materials suitable also for passive radiative cooling in human body applications (Wei et al 2020;Zhang et al 2019;Peng et al 2018;Xiao et al 2019). Furthermore, the visible properties of cellulose materials can be manipulated by additives or via changes in the structural arrangement at the nanoscale and microscale (Vasileva et al 2017;Koivurova et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Reflective and transparent cellulose-based passive radiative coolers

et al. 2021

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Radiative cooling passively removes heat from objects via emission of thermal radiation to cold space. Suitable radiative cooling materials absorb infrared light while they avoid solar heating by either reflecting or transmitting solar radiation, depending on the application. Here, we demonstrate a reflective radiative cooler and a transparent radiative cooler solely based on cellulose derivatives manufactured via electrospinning and casting, respectively. By modifying the microstructure of cellulose materials, we control the solar light interaction from highly reflective (> 90%, porous structure) to highly transparent (≈ 90%, homogenous structure). Both cellulose materials show high thermal emissivity and minimal solar absorption, making them suitable for daytime radiative cooling. Used as coatings on silicon samples exposed to sun light at daytime, the reflective and transparent cellulose coolers could passively reduce sample temperatures by up to 15 °C and 5 °C, respectively.

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Section: Fundamental Principles For 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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Infrared-Radiation-Enhanced Nanofiber Membrane for Sky Radiative Cooling of the Human Body

Cited by 106 publications

References 32 publications

Recent Progress in Daytime Radiative Cooling: Advanced Material Designs and Applications

Recent Progress in Daytime Radiative Cooling: Advanced Material Designs and Applications

Reflective and transparent cellulose-based passive radiative coolers

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

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