Ultrafine silica aerogels microspheres for adaptive thermal management in large-temperature-fluctuation environment

Liu, Ling; Fu, Jiahui; Hu, Xueyan; Yuan, Dengsen; Wang, Jin; Li, Qingwen

doi:10.1016/j.cej.2023.144258

Cited by 10 publications

(1 citation statement)

References 66 publications

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“…Consequently, their PDRC behavior must be considered to achieve ideal thermal management when employing silica aerogels in outdoor environments . Subsequently, the PRC was discovered to be a universal property of most aerogels, including GO aerogel, boron nitride (BN) aerogel, poly( p -phenylene-2,6-benzobisoxazole) aerogel, Kevlar aerogel, and PI aerogel. − Nevertheless, the radiative cooling of aerogels, especially in wearable applications, has been relatively less applied than thermal insulation.…”

Section: Wearable Aerogels For Ptmmentioning

confidence: 99%

Wearable Aerogels for Personal Thermal Management and Smart Devices

Wu,

Qi,

Liu

et al. 2024

ACS Nano

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Extreme climates have become frequent nowadays, causing increased heat stress in human daily life. Personal thermal management (PTM), a technology that controls the human body's microenvironment, has become a promising strategy to address heat stress. While effective in ordinary environments, traditional high-performance fibers, such as ultrafine, porous, highly thermally conductive, and phase change materials, fall short when dealing with harsh conditions or large temperature fluctuations. Aerogels, a third-generation superinsulation material, have garnered extensive attention among researchers for their thermal management applications in building energy conservation, transportation, and aerospace, attributed to their extremely low densities and thermal conductivity. While aerogels have historically faced challenges related to weak mechanical strength and limited secondary processing capacity, recent advancements have witnessed notable progress in the development of wearable aerogels for PTM. This progress underscores their potential applications within extremely harsh environments, serving as self-powered smart devices and sensors. This Review offers a timely overview of wearable aerogels and their PTM applications with a particular focus on their wearability and suitability. Finally, the discussion classifies five types of PTM applications based on aerogel function: thermal insulation, heating, cooling, adaptive regulation (involving thermal insulation, heating, and cooling), and utilization of aerogels as wearable smart devices.

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Section: Wearable Aerogels For Ptmmentioning

confidence: 99%

Wearable Aerogels for Personal Thermal Management and Smart Devices

Wu,

Qi,

Liu

et al. 2024

ACS Nano

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Half‐Full Filled Aerogels with a 348% Increment in Energy Absorption and a Retained High Electromagnetic Shielding Performance

Kong,

Lv,

et al. 2024

Adv Funct Materials

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Aerogels, as kinetic energy absorbing materials, can find crucial applications for safeguarding in transportation, sports, buildings, construction, and aerospace. However, the highly porous structure makes it extremely fragile for endurance usage. In this study, a half‐full filled structure has been proposed, and the concept has been demonstrated based on shear thickening fluid (STF) and chemically vapor deposited carbon nanotube aerogels (CNTAs), in which the outer part of CNTA is filled with STF while the inner core keeping unfilled. Chemical vapor deposition significantly enhances the elasticity and electromagnetic shielding performance of the native CNTA. The half‐full filled aerogels (HFFA) show a 348% increase in energy absorption compared to the CNTA. At the same time, the density, electronic conductivity, and electromagnetic interference shielding effectiveness (EMI SE) of the HFFAs are 0.117 g cm−3, 1213 S m−1, and 69.52 dB (which is a neglectable reduction of 0.63% compared to native CNTA), respectively. The HFFA strategy provides an alternative route to fabricate robust aerogels with a remarkable increase of target properties while maintaining other properties, such as low density, high pore volume, and conductivity, with limited changes.

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Waterborne polyurethane/cellulose composite aerogel with passive cooling and thermal insulation properties

He,

Zhang,

et al. 2024

J of Applied Polymer Sci

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Passive cooling is a cooling technology that does not require external energy input, with most passive cooling strategies having high manufacturing difficulty and cost. In this study, we prepared lightweight aerogels (0.093 g/cm3) with high porosity (91.3%), directional pores, enhanced elastic recovery performance, and lower thermal conductivity (0.046 W/mK) through simple mixing, directional freezing, and freeze‐drying. The prepared samples have a reflectance of 87% in the ultraviolet—visible—near‐infrared (UV‐Vis‐NIR) range (0.2–2.5 μm) and an emissivity of 93.6% in the atmospheric transparency window. After covering the box with axial and transverse aerogel samples, the temperature inside the box relative to the uncovered sample box decreased by 12.9 and 13.4°C, respectively. This work provides a feasible method for the research of simply prepared passive cooling materials.

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Ultrafine silica aerogels microspheres for adaptive thermal management in large-temperature-fluctuation environment

Cited by 10 publications

References 66 publications

Wearable Aerogels for Personal Thermal Management and Smart Devices

Wearable Aerogels for Personal Thermal Management and Smart Devices

Half‐Full Filled Aerogels with a 348% Increment in Energy Absorption and a Retained High Electromagnetic Shielding Performance

Waterborne polyurethane/cellulose composite aerogel with passive cooling and thermal insulation properties

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