Radiative heat attenuation mechanisms for nanoporous thermal insulating composites

Feng, Jinpeng; Wang, Youlan; Xia, Feng; Huang, Qiang; Ma, Shuo; Mo, Wei; Yang, Jian; Su, Xiujuan; Mei-qun, Lin

doi:10.1016/j.applthermaleng.2016.05.136

Cited by 17 publications

(2 citation statements)

References 19 publications

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“…To demonstrate the advantages of our present aerogels in thermal management potentials (Figure 4a), the printed aerogel lattices with various patterns were placed on a 100 °C (Figure 4b) heating or a −20 °C cold (Figure 4c) plate, and an infrared thermal imaging camera was used to observe the temperature evolutions from the top view. Since SiC is a well-known opacifier that can restrain thermal radiation, 41 the effect of thermal radiation on heat transfer would be neglected here. For the periodic aerogel lattices with open pore structures (top left of hexagon, top right of square, and bottom right of triangle), the temperature in the area where the aerogel appears is related to the thickness, which is the same as that of the bulk aerogel.…”

Section: Resultsmentioning

confidence: 99%

Additive Manufacturing of Resilient SiC Nanowire Aerogels

Guo

Peng

et al. 2022

ACS Nano

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Resilient ceramic aerogels are emerging as a fascinating material that features light weight, low thermal conductivity, and recoverable compressibility, promising widespread prospects in the fields of heat insulation, catalysis, filtration, and aerospace exploration. However, the construction of the resilient ceramic aerogels with rational designed multiscale architectures aiming for tunable physical and mechanical performances remains a major challenge. Here, 3D constructed resilient SiC nanowire aerogels possessing programmed geometries and engineered mechanical properties are created via additive manufacturing. The Young’s modulus of the fabricated SiC nanowire aerogel lattices are tuned systematically from 0.012 MPa to 5.800 MPa spanning over 2 orders of magnitude. More importantly, the customized lightweight and resilient SiC nanowire aerogels show a low thermal conductivity (0.046 W m–1 K–1). The present work provides another approach to the design and rapid fabrication of resilient ceramic aerogels toward flexible thermal management devices, lightweight engineered structures, and other potential applications.

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Section: Resultsmentioning

confidence: 99%

Additive Manufacturing of Resilient SiC Nanowire Aerogels

Guo

Peng

et al. 2022

ACS Nano

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“…Opacifier particles with high absorption mechanism or reflectivity for near-infrared bandwidth, such as Titanium oxide (TiO 2 ) [27,28], carbon black [29], and SiC [30][31][32], were added to the aerogels as a filler to decrease the infrared transmittance significantly, thereby reducing radiative thermal conductivity at elevated temperatures [24,27,29,33]. Notably, the opacifier takes the volume fraction in a small proportion, the high porosity of nanofibrous aerogel can be maintained, and the pores are filled, which is beneficial to lower thermal conductivity [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Light and Ultra-Low Thermal Conductivity of Elastic Silica Nanofibrous Aerogel with TiO2 Opacifier Particles as Filler

et al. 2022

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The thermal radiation phenomenon is more crucial than other thermal transportation phenomena at elevated temperatures (>300 °C). Therefore, infrared radiation resistance and its performance on thermal conduction of nanofibrous aerogel with Titanium oxide (TiO2) filler have been investigated compared to control groups (silica nanofibrous aerogels with and without filler). Nanofibrous aerogel has been produced by electrospun silica nanofibers. Later, TiO2 opacifier and a non-opacifier filled materials were prepared by a solution homogenization method and then freeze-dried to obtain particle-filled nanofibrous aerogel. Moreover, the thermal radiation conductivity of the composite was calculated by numerical simulation, and the effect of the anti-infrared radiation of the TiO2 opacifier was obtained. The fascinating inhibited infrared radiation transmission performance (infrared transmittance ~67% at 3 μm) and excellent thermal insulation effect (thermal conductivity of 0.019 Wm−1K−1 at room temperature) and maximum compressive strengths (3.22 kPa) of silica nanofibrous aerogel with TiO2 opacifier were verified. Excellent thermal insulation, compression and thermal stability properties show its potential for practical application in industrial production. The successful synthesis of this material may shed light on the development of other insulative ceramic aerogels.

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Opacified graphene-doped silica aerogels with controllable thermal conductivity

Zhu

Ren

2018

J Porous Mater

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Radiative heat attenuation mechanisms for nanoporous thermal insulating composites

Cited by 17 publications

References 19 publications

Additive Manufacturing of Resilient SiC Nanowire Aerogels

Additive Manufacturing of Resilient SiC Nanowire Aerogels

Ultra-Light and Ultra-Low Thermal Conductivity of Elastic Silica Nanofibrous Aerogel with TiO2 Opacifier Particles as Filler

Opacified graphene-doped silica aerogels with controllable thermal conductivity

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