A dual-mode textile for human body radiative heating and cooling

Hsu, Po‐Chun; Liu, Chong; Song, Yu; Zhang, Ze; Peng, Yucan; Xie, Jin; Li, Kai; Wu, Chun Lan; Catrysse, Peter B.; Cai, Lili; Zhai, Shang; Majumdar, Arun; Fan, Shanhui; Cui, Yi

doi:10.1126/sciadv.1700895

Cited by 473 publications

(382 citation statements)

References 27 publications

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“…A dual‐mode textile that can perform both passive radiative heating and cooling was also reported recently (Figure d) . It is composed of a bilayer emitter embedded inside an infrared‐transparent nano‐PE layer which has different emissivities and asymmetric thicknesses on each side.…”

Section: Other Applicationsmentioning

confidence: 80%

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Porous Polymers as Multifunctional Material Platforms toward Task‐Specific Applications

et al. 2018

Advanced Materials

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have triggered serious threats to the survival and development of mankind. Consequently, exploring novel materials with task-specific applications is of fundamental importance for the sustainable development of economy and society. The burgeoning progress of nanomaterials in recent years has demonstrated that porosity is one of the essential factors in determining material properties for possible breakthroughs in their applications. Therefore, porous materials are playing important roles in many well-established applications and emerging technologies for challenging social and economic issues due to their intrinsic characteristics of large surface areas, open channels, and the possible control over the pore environment. According to International Union of Pure and Applied Chemistry, the pores of porous materials are classified into three categories by their pore sizes: micropores are smaller than 2 nm, mesopores are in the range of 2-50 nm, and macropores are larger than 50 nm. [1] Their pore walls include the organic skeleton (e.g., porous polymers, organic porous cages, and supramolecular organic frameworks), the inorganic skeleton (e.g., zeolites, porous carbons, and mesoporous silica), and the hybrid skeleton (e.g., metal-organic frameworks (MOFs)).Among the developed porous materials, porous polymers have attracted an increasing level of research interest owing to their potential to integrate the advantages of both porous materials and polymers. [2,3] Table 1 lists the characteristic structural features and properties of porous polymers, and gives a systematic comparison to other typical porous materials, such as zeolites, porous carbons, and MOFs. Porous polymers, zeolites, porous carbons, and MOFs share a number of features such as high permanent porosities, large surface areas, and designable pores and voids. However, they are different in several important aspects. The major advantages of porous polymers over many other porous materials are their chemical diversity and easy processability. Compared to zeolites and porous carbons, the synthesis of porous polymers is generally more versatile and can be approached in a way that conforms to the concept of rational materials design. Similar to MOFs, porous polymers inherit the excellent chemical and physical tunability afforded by the versatility of organic chemistry. Furthermore, Exploring advanced porous materials is of critical importance in the development of science and technology. Porous polymers, being famous for their all-organic components, tailored pore structures, and adjustable chemical components, have attracted an increasing level of research interest in a large number of applications, including gas adsorption/storage, separation, catalysis, environmental remediation, energy, optoelectronics, and health. Recent years have witnessed tremendous research breakthroughs in these fields thanks to the unique pore structures and versatile skeletons of porous polymers. Here, recent milestones in the diverse applications of porous polymers are presented, ...

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Section: Other Applicationsmentioning

confidence: 80%

Section: Other Applicationsmentioning

confidence: 99%

Porous Polymers as Multifunctional Material Platforms toward Task‐Specific Applications

et al. 2018

Advanced Materials

356

245

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“…Recently, there has been growing interest in personal thermoregulation devices (8,9), which can deliver a precise thermal dose to target spots on individuals and consequently reduce the heating or cooling volume by orders of magnitude compared with building/vehicular-level thermal envelops. While the traditional heating/cooling system has an advantage in covering large space with high cooling/heating capacity and efficiency, which is suitable for applications in large-scale buildings with a large number of occupants, or when the ambient temperature is significantly deviated from the thermal comfort temperature, it is also desirable to use personalized thermoregulation in both indoor and outdoor scenarios for energy efficiency purposes when the number of occupants to be cooled/heated is small or for enhanced comfort and health for individuals with different thermal comfort zones.…”

Section: Introductionmentioning

confidence: 99%

Wearable thermoelectrics for personalized thermoregulation

et al. 2019

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Thermoregulation has substantial implications for energy consumption and human comfort and health. However, cooling technology has remained largely unchanged for more than a century and still relies on cooling the entire space regardless of the number of occupants. Personalized thermoregulation by thermoelectric devices (TEDs) can markedly reduce the cooling volume and meet individual cooling needs but has yet to be realized because of the lack of flexible TEDs with sustainable high cooling performance. Here, we demonstrate a wearable TED that can deliver more than 10°C cooling effect with a high coefficient of performance (COP > 1.5). Our TED is the first to achieve long-term active cooling with high flexibility, due to a novel design of double elastomer layers and high-ZT rigid TE pillars. Thermoregulation based on these devices may enable a shift from centralized cooling toward personalized cooling with the benefits of substantially lower energy consumption and improved human comfort.

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“…Most recently, the same group extended their idea of IR‐transparent nanoPE further and developed a dual‐mode fabric with an asymmetrical (dual) thermal emitter embedded in the asymmetrical thickness of nanoPE so that flipping the fabric will switch between the radiative functions of cooling and heating . This new extension however inherits the same blunders from the first paper …”

Section: A Dubious New Clothmentioning

confidence: 96%

Unique Thermal Properties of Clothing Materials

Pan

2019

Global Challenges

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Cloth wearing seems so natural that everyone is self‐deemed knowledgeable and has some expert opinions about it. However, to clearly explain the physics involved, and hence to make predictions for clothing design or selection, it turns out to be quite challenging even for experts. Cloth is a multiphased, porous, and anisotropic material system and usually in multilayers. The human body acts as an internal heat source in a clothing situation, thus forming a temperature gradient between body and ambient. But unlike ordinary engineering heat transfer problems, the sign of this gradient often changes as the ambient temperature varies. The human body also perspires and the sweat evaporates, an effective body cooling process via phase change. To bring all the variables into analysis quickly escalates into a formidable task. This work attempts to unravel the problem from a physics perspective, focusing on a few rarely noticed yet critically important mechanisms involved so as to offer a clearer and more accurate depiction of the principles in clothing thermal comfort.

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A dual-mode textile for human body radiative heating and cooling

Abstract: Dual-mode textiles made of nanoPE provide both cooling and heating, which helps humans adapt to larger temperature changes.

Cited by 473 publications

References 27 publications

Porous Polymers as Multifunctional Material Platforms toward Task‐Specific Applications

Porous Polymers as Multifunctional Material Platforms toward Task‐Specific Applications

Wearable thermoelectrics for personalized thermoregulation

Unique Thermal Properties of Clothing Materials

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