Elastic ceramic aerogels for thermal superinsulation under extreme conditions

Xu, Xiang; Fu, Shubin; Guo, Jingran; Li, Hui; Huang, Yu; Duan, Xiangfeng

doi:10.1016/j.mattod.2020.09.034

Cited by 103 publications

(74 citation statements)

References 108 publications

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“…Thus, HTRAs of Al 2 O 3 , ZrO 2 , and TiO 2 aerogels that can resistant to 1300 ℃ had been obtained. [12,69,70] During the process of preparation of this review, fiber-reinforced Al 2 O 3 -SiO 2 composite aerogels have been reported, and they exhibited impressive HTR up to 1500 ℃ with ultralow shrinkage. Apparently, hybrid structure design toward HTRAs is a strong and effective approach.…”

Section: Mechanism Of High Temperature Resistancementioning

confidence: 99%

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Design, Synthesis, and Use of High Temperature Resistant Aerogels Exceeding 800 oC

Hu¹,

Liu²,

Zhao³

et al. 2021

ES Mater. Manuf.

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As a type of ultra-light and super thermal insulation solid state porous materials, aerogels have attracted increasing attention for aerospace, transportation, and building insulation applications. However, when aerogels are applied in these fields, resistance to high temperature is a prerequisite for them. The most traditional silica aerogels can resist up to 600 ℃, but their porous structures are destroyed at higher temperatures and no longer possess the excellent thermal insulation capacity and low density. Though a great number of new aerogels have been reported in the past two decades, the number of aerogels that could resist to ultra-high temperature, e.g. >800 ℃, is relative few. Nevertheless, it's exciting to see that more and more aerogels that can resist to temperatures higher than 1000 ℃, and even up to 1500 ℃, have been reported in the past few years. This paper gives an overview of aerogels that could resist to more than 800 ℃, and they defined as high temperature resistant aerogels (HTRAs) in this review. The synthetic strategies, mechanisms, chemical compositions, and specific applications of the HTRAs will be reviewed and discussed. This paper would be a timely review to summarized the most recent progress in the HTRAs, and provide insights into the designing of various HTRAs.

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Section: Mechanism Of High Temperature Resistancementioning

confidence: 99%

“…the temperatures are higher than 800 ℃. [12][13][14][15] There is currently no unified definition of aerogel, and the concept has been continuously developed. The IUPAC definition of aerogel is that a gel composed of microporous solids whose dispersed phase is gas.…”

Section: Introductionmentioning

confidence: 99%

Design, Synthesis, and Use of High Temperature Resistant Aerogels Exceeding 800 oC

Hu¹,

Liu²,

Zhao³

et al. 2021

ES Mater. Manuf.

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show abstract

“…In addition, the ceramic fiber materials usually have excellent flexibility, which makes it better than ordinary bulk insulation materials. Therefore, application of ceramic fibers material, as high temperature insulation materials, has attracted increasing attention in recent years [1,2,6,10,73,91,[148][149][150].…”

Section: Thermal Insulationmentioning

confidence: 99%

Flexible Ceramic Fibers: Recent Development in Preparation and Application

Jia

Luo

et al. 2022

Adv. Fiber Mater.

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Flexible ceramic fibers (FCFs) have been developed for various advanced applications due to their superior mechanical flexibility, high temperature resistance, and excellent chemical stability. In this article, we present an overview on the recent progress of FCFs in terms of materials, fabrication methods, and applications. We begin with a brief introduction to FCFs and the materials for preparation of FCFs. After that, various methods for preparation of FCFs are discussed, including centrifugal spinning, electrospinning, solution blow spinning, self-assembly, chemical vapor deposition, atomic layer deposition, and polymer conversion. Recent applications of FCFs in various fields are further illustrated in detail, including thermal insulation, air filtration, water treatment, sound absorption, electromagnetic wave absorption, battery separator, catalytic application, among others. Finally, some perspectives on the future directions and opportunities for the preparation and application of FCFs are highlighted. We envision that this review will provide readers with some meaningful guidance on the preparation of FCFs and inspire them to explore more potential applications.

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“…[9][10][11] Engineering semiconducting elastic aerogels as the active layer has proven to be an effective technique to improve mechanical flexibility and responsive range. [12][13][14] These aerogels are fabricated by a wide variety of building blocks such as carbon nanotubes, [15] reduced graphene sheets, [16] and conducting polymers. [17,18] Conducting polymers-based aerogel sensors has shown great potential due to their intrinsic mechanical softness and electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…The key component of this unique design is an aerogel of polypyrrole nanotubes which exhibit superior sensing performance to that of conventional globular structured aerogels by eliminating weak necklace-like connection of polypyrrole particles upon compression and stretching. [14,18] This aerogel can be conveniently synthesized by polymerizing pyrrole against sacrificial templates of copper nanowires (CuNWs), which are simultaneously removed by the acid generated during pyrrole polymerization. Combining the as-designed aerogel with a polyacrylamide (PAAm) hydrogel produces a hybrid-structured flexible sensor capable of monitoring pressure change over a wide range, from human physiological signals of weak pulse wave to extremely large stress imposed by vehicles.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Resistant Aerogel/Hydrogel Nanostructured Hybrid for Highly Sensitive and Ultrabroad Pressure Sensing

Huang

Zeng

Zhang

et al. 2021

Small

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Achieving high sensitivity over a broad pressure range remains a great challenge in designing piezoresistive pressure sensors due to the irreconcilable requirements in structural deformability against extremely high pressures and piezoresistive sensitivity to very low pressures. This work proposes a hybrid aerogel/hydrogel sensor by integrating a nanotube structured polypyrrole aerogel with a polyacrylamide (PAAm) hydrogel. The aerogel is composed of durable twined polypyrrole nanotubes fabricated through a sacrificial templating approach. Its electromechanical performance can be regulated by controlling the thickness of the tube shell. A thicker shell enhances the charge mobility between tube walls and thus expedites current responses, making it highly sensitive in detecting low pressure. Moreover, a nucleotide‐doped PAAm hydrogel with a reversible noncovalent interaction network is harnessed as the flexible substrate to assemble the aerogel/hydrogel hybrid sensor and overcome sensing saturation under extreme pressures. This highly stretchable and self‐healable hybrid polymer sensor exhibits linear response with high sensitivity (Smin > 1.1 kPa−1), ultrabroad sensing range (0.12–≈400 kPa), and stable sensing performance over 10 000 cycles at the pressure of 150 kPa, making it an ideal sensing device to monitor pressures from human physiological signals to significant stress exerted by vehicles.

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Elastic ceramic aerogels for thermal superinsulation under extreme conditions

Cited by 103 publications

References 108 publications

Design, Synthesis, and Use of High Temperature Resistant Aerogels Exceeding 800 oC

Design, Synthesis, and Use of High Temperature Resistant Aerogels Exceeding 800 oC

Flexible Ceramic Fibers: Recent Development in Preparation and Application

Fatigue Resistant Aerogel/Hydrogel Nanostructured Hybrid for Highly Sensitive and Ultrabroad Pressure Sensing

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