Low thermal conductivity carbon fibrous composite nanomaterial enabled by multi-scale porous structure

Gbewonyo, Spero; Carpenter, Alexis W.; Gause, Charles B.; Mucha, Nikhil Reddy; Zhang, Lifeng

doi:10.1016/j.matdes.2017.08.050

Cited by 21 publications

(12 citation statements)

References 20 publications

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“…where n, σ, ρ and T are the effective refractive index, Stefan-Boltzmann constant, sample density, and temperature. In general, λs can be reduced by decreasing the bulk density, λg can be decreased by narrowing the pore size of the material and λr can be reduced by enhancing the e * [18]. Owing to the unique multichannel structure and components, the as-prepared MSUF membranes exhibited excellent thermal insulation performance, which makes it a promising thermal insulating material for application in the field of aerospace and aircrafts.…”

Section: Thermal Insulation Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Recently, it has been found that constructing porous structure is an effective way to reduce the thermal conductivity of fibers [18][19][20][21][22]. On the one hand, the porous structure will lengthen the path of heat transfer and hinder the gaseous heat conduction, leading to a low solid and gas heat transfer [18,19]. On the other hand, the multiscale porous structure contributes to enhance multiple reflection-absorption of the IR radiation, which can decrease radiation heat transfer [16,20,21].…”

Section: Introductionmentioning

confidence: 99%

“…Gbewonyo et al [18] prepared porous carbon fibers with multi-scale (micro, submicro, and nano) porous structure delivered by electrospinning method. Compared with carbon fibers, the thermal conductivity of the porous carbon fibers with nanoscale structure decreased 98 % to 0.15 W m -1 •K -1 at ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the SiO2-TiO2 and SiO2-ZrO2 porous fibers had great potential to be used in the thermal insulation fields. However, despite these advances, ceramic fibers with highly porous structure usually suffered from the poor mechanical properties, which was mainly due to the brittle nature of ceramics and numerous pore defects [14,18,19]. Therefore, it was still a long-standing challenge in designing porous structured ceramic fibers with both high flexibility and thermal insulation performance.…”

Section: Introductionmentioning

confidence: 99%

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Multichannel and Super-flexible SiZrOC Ultrafine Fibers for High Temperature Thermal Insulation

Zhang

Tian

Wang

et al. 2021

Preprint

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Light but robust porous ceramic fibers with combined properties of super flexibility, excellent thermal stability and thermal insulation performance are attractive for use in extreme conditions, especially in the field of aerospace. However, the practical application of traditional porous ceramic fibers are usually limited by their brittle nature and poor mechanical properties. Herein, we designed a multichannel SiZrOC ultrafine fiber (MSUF) composed of ZrO2, SiOxCy and free carbon phases by electrospinning technique. The resulting fibers exhibited integrated properties of excellent fire resistance, high temperature stability, thermal shock resistance and temperature-invariant flexibility. More importantly, the fancy multichannel structure and components of the fiber provides it with outstanding thermal insulation performance with low thermal conductivity (0.041 W m-1·K-1 at 25 ºC and 0.141 W m-1·K-1 at 1000 ºC). The successful fabrication of such flexible porous MSUFs may provide a new approach to design high performance thermal insulators for high temperature thermal insulation.

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Section: Thermal Insulation Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Multichannel and Super-flexible SiZrOC Ultrafine Fibers for High Temperature Thermal Insulation

Zhang

Tian

Wang

et al. 2021

Preprint

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Superelastic Carbon Aerogels: An Emerging Material for Advanced Thermal Protection in Extreme Environments

Chang

Cheng

Zhang

et al. 2023

Adv Funct Materials

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speed airflow scouring. Accordingly, the thermal protection system (TPS) must be applied on their surface to cope with the integrated heat load accumulated during flight. [2] The lightweight nature of TPS is critical in addressing the criteria for ultralong-range combat military weapons with high sound speeds and load capacities while considering the production cost in check. Kistler of Stanford University first proposed the concept of aerogel in 1931, [3] which was fabricated by exchanging the liquid in a wet gel by gas whilst guaranteeing that the internal structure did not collapse, becoming one of the lightest solid materials known to date. The abundance of internal nanoscale pore size and highly tortuous pore structure determine aerogel's excellent thermally insulation performance, with the thermal conductivity as low as 0.005 W m −1 K −1 . [4] NASA pioneered the use of aerogels as efficient insulating materials on several Mars rovers and spacecraft parts, such as the insulation assembly of Rover Mars batteries, the outer surface of vehicle decelerators, [5] etc., and is also advancing their application in extra-vehicular insulating suits. [6] Oxide ceramic aerogels have currently been the most rapidly developed in high-temperature insulation; however, due to the restrictions of crystallization-induced pulverization, large thermal expansion, and relatively low operating temperatures, for example, SiO 2 (650 °C), [7] ZrO 2 (1100 °C), [8] Al 2 O 3 (1300 °C), [9] and mullite (1400 °C), these aerogels and their composites suffer from severe strength deterioration and catastrophic structural failure during significant temperature gradient changes or long-term high-temperature exposure. [10] Conversely, carbon aerogels (CAs) maintain their mesoporous structure despite heat treatment over 2500 °C under a vacuum or inert atmosphere, showing favorable thermal stability at ultra-high temperatures. [11] In addition, they also have a much higher specific extinction coefficient (190 m 2 kg −1 ) than others (e.g., SiO 2 aerogel with 20 m 2 kg −1 ), which leads to lower radiative thermal conductivities. [12] Therefore, CAs are anticipated to be up-and-coming candidates for the TPS of hypersonic vehicles in conditions of severe heat flow density and ultra-high temperatures.The terms of CAs initially referred to carbonaceous substances that exist as 3D monoliths macroscopically and

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Low thermal conductivity carbon material from electrospinning and subsequent chemical activation

et al. 2019

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Low thermal conductivity carbon fibrous composite nanomaterial enabled by multi-scale porous structure

Cited by 21 publications

References 20 publications

Multichannel and Super-flexible SiZrOC Ultrafine Fibers for High Temperature Thermal Insulation

Multichannel and Super-flexible SiZrOC Ultrafine Fibers for High Temperature Thermal Insulation

Superelastic Carbon Aerogels: An Emerging Material for Advanced Thermal Protection in Extreme Environments

Low thermal conductivity carbon material from electrospinning and subsequent chemical activation

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Low thermal conductivity carbon fibrous composite nanomaterial enabled by multi-scale porous structure

Cited by 21 publications

References 20 publications

Multichannel and Super-flexible SiZrOC&nbsp;Ultrafine Fibers for High Temperature Thermal Insulation

Multichannel and Super-flexible SiZrOC&nbsp;Ultrafine Fibers for High Temperature Thermal Insulation

Superelastic Carbon Aerogels: An Emerging Material for Advanced Thermal Protection in Extreme Environments

Low thermal conductivity carbon material from electrospinning and subsequent chemical activation

Contact Info

Product

Resources

About

Multichannel and Super-flexible SiZrOC Ultrafine Fibers for High Temperature Thermal Insulation

Multichannel and Super-flexible SiZrOC Ultrafine Fibers for High Temperature Thermal Insulation