Medium-entropy ceramic aerogels for robust thermal sealing

Fu, Shubin; Liu, Dizhou; Deng, Yuanpeng; Li, Menglin; Zhao, Han; Guo, Jingran; Zhou, Jian; Zhang, Pengyu; Wang, Chong; Yu, Hongxuan; Dang, Shixuan; Zhang, Jianing; Hao, Menglong; Li, Hui; Xu, Xiang

doi:10.1039/d2ta08264k

Cited by 8 publications

(1 citation statement)

References 79 publications

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“…14 Numerous studies have focussed on enhancing the mechanical stability of materials via micro-or macro-structural design via synthetic self-assembled 3D microbrillar networks for use in thermal insulation applications under severe conditions. [15][16][17] For instance, ceramic materials are engineered to form a porous framework with a one-dimensional structure, 18 exploiting physical entanglement or chemical bonding between bers to attain high elasticity, [19][20][21] exibility, 22 and ductility. 23 However, a single ceramic ber usually exhibits a fragile structural stability due to the crystallization-induced pulverization at high temperature.…”

Section: Introductionmentioning

confidence: 99%

Thermal-insulating ceramic fiber aerogels reinforced by fusing knots of overlapping fibers for superelasticity and high compression resistance

Meng,

Liu,

Zhang

et al. 2024

J. Mater. Chem. A

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Section: Introductionmentioning

confidence: 99%

Thermal-insulating ceramic fiber aerogels reinforced by fusing knots of overlapping fibers for superelasticity and high compression resistance

Meng,

Liu,

Zhang

et al. 2024

J. Mater. Chem. A

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Highly‐Buckled Nanofibrous Ceramic Aerogels with Ultra‐Large Stretchability and Tensile‐Insensitive Thermal Insulation

Dang,

Guo,

Deng

et al. 2024

Advanced Materials

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Ceramic aerogels have exhibited many superior characteristics with promising applications. As an attractive material system for thermal insulation under extreme conditions, ceramic aerogels are required to withstand complex thermomechanical stress to retain their super‐insulating properties but, they often suffer from severe fracture damage that can lead to catastrophic failure. Herein, inspired by the tendrils of Parthenocissus, we report a design and synthesis of ultra‐stretchable ceramic aerogels constructed by highly buckled nanofibers. The buckling of nanofibers is formed by asymmetric deformation through two‐component off‐axial electrospinning method. The resulting aerogels feature an ultra‐large stretchability with a tensile strain of up to 150% and high restorability with a tensile strain of up to 80%. They also display a near‐zero Poisson's ratio (4.3 × 10−2) and a near‐zero thermal expansion coefficient (2.6 × 10−7 per °C), resulting in excellent thermomechanical stability. Benefiting from this ultra‐stretchability, the aerogels exhibit a unique tensile‐insensitive thermal insulation performance with thermal conductivities remaining only ≈106.7 mW m−1 K−1 at 1000 °C. This work promotes the development of ceramic aerogels for robust thermal insulation under extreme conditions and establishes a set of fundamental considerations in structural design of stretchable aerogels for a wide spectrum of applications.

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Ultrastrong and Reusable Solar‒Thermal‒Electric Generators by Economical Starch Vitrimers

Gao,

Ku,

Chen

et al. 2024

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In frigid regions, it is imperative to possess functionality materials that are ultrastrong, reusable, and economical, providing self‐generated heat and electricity. One promising solution is a solar‒thermal‒electric (STE) generator, composed of solar‒thermal conversion phase change composites (PCCs) and temperature‐difference power‐generation‐sheets. However, the existing PCCs face challenges with conflicting requirements for solar‒thermal conversion efficiency and mechanical robustness, mainly due to monotonous functionalized aerogel framework. Herein, a novel starch vitrimer aerogel is proposed that incorporates orientational distributed carboxylated carbon nanotubes (CCNT) to create PCC. This innovative design integrates large through‐holes, mechanical robustness, and superior solar‒thermal conversion. Remarkably, PCC with only 0.8 wt.% CCNT loading achieves 85.8 MPa compressive strength, 102.4 °C at 200 mW cm−2 irradiation with an impressive 92.9% solar–thermal conversion efficiency. Noteworthy, the STE generator assembled with PCC harvests 99.1 W m−2 output power density, surpassing other reported STE generators. Strikingly, even under harsh conditions of −10 °C and 10 mW cm‒2 irradiation, the STE generator maintains 20 °C for PCC with 325 mV output voltage and 45 mA current, showcasing enhanced electricity generation in colder environments. This study introduces a groundbreaking STE generator, paving the way for self‐sufficient heat and electricity supply in cold regions.

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Medium-entropy ceramic aerogels for robust thermal sealing

Abstract: Thermal sealing is essential to prevent thermal runaway in aerospace and mechanical fields. Ceramic aerogels are attractive candidates but often show limited thermomechanical performance and thermal radiation opacification that may...

Cited by 8 publications

References 79 publications

Thermal-insulating ceramic fiber aerogels reinforced by fusing knots of overlapping fibers for superelasticity and high compression resistance

Thermal-insulating ceramic fiber aerogels reinforced by fusing knots of overlapping fibers for superelasticity and high compression resistance

Highly‐Buckled Nanofibrous Ceramic Aerogels with Ultra‐Large Stretchability and Tensile‐Insensitive Thermal Insulation

Ultrastrong and Reusable Solar‒Thermal‒Electric Generators by Economical Starch Vitrimers

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