Strong, superelastic and multifunctional SiC@ pyrolytic carbon nanofibers aerogels

Lu, Deping; Niu, Min; Zhuang, Lei; Su, Lei; Guo, Pengfei; Gao, Hongfei; Xu, Liang; Cai, Zhixin; Li, Mingzhu; Peng, Kang; Wang, Hongjie

doi:10.1016/j.carbon.2022.02.027

Cited by 21 publications

(20 citation statements)

References 33 publications

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“…The compression recovery test of composite aerogel under liquid N 2 was shown in Figure c; the DF-4/CNF-8 could quickly recover to its original shape from nearly 80% strain. Its remarkable stability made it a material with broad prospects for application in harsh environments. , …”

Section: Resultsmentioning

confidence: 99%

“…Its remarkable stability made it a material with broad prospects for application in harsh environments. 35,36 Figure 5d-f summarized the compression characteristics of DF-x/CNF-y aerogel when the longitudinal and transversal compression strain was 20%, 40%, 60%, and 80%, respectively. Figure 5d shows the height recovery of DF-x/CNF-y under transversal compression.…”

Section: Mechanical Propertymentioning

confidence: 99%

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Down Fiber Reinforced Cellulose Nanofiber Aerogel toward Thermal Insulation and Pollutant Removal

Wang

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Cellulose nanofiber (CNF) aerogels have the advantages of being eco-friendly, hydrophilic, and biocompatible and of having high porosity and large surface area. but low mechanical durability is a main challenge. In this regard, we proposed to fabricate a DF-x/CNF-y composite aerogel through a directional freeze-drying method using down fiber (DF) as the reinforcing filler and 1,2,3,4-butanetetracarboxylic acid (BTCA) as the cross-linking agent. Due to the good compatibility between DF and CNF, DF could effectively improve the strength of a composite aerogel by dispersing stress along the pore wall. The DF-x/CNF-y composite aerogel had significant longitudinal and transversal mechanical properties. The presence of DF in the matrix promoted crystal nucleation and provided a large surface area for crystal growth, which improved thermal stability and thermal insulation performances of the composite aerogel. The capillary effect of hollow DF and the interaction between DF and CNF significantly enhanced the DF-x/CNF-y composite aerogel adsorption performance. Methylene blue (MB) was chosen as a model pollutant. The removal rate of MB correlated well with the pseudo-second-order kinetics and Langmuir model (R 2 [0.9999]), its maximum adsorption capacity for MB reached up to ∼250.21 mg/g. This work provides a strategy for the fabrication of a composite aerogel, which might have potential application prospects such as space, infrared stealth, water purification, and chemical contaminant remediation.

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Section: Resultsmentioning

confidence: 99%

Section: Mechanical Propertymentioning

confidence: 99%

Down Fiber Reinforced Cellulose Nanofiber Aerogel toward Thermal Insulation and Pollutant Removal

Wang

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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“…However, silica aerogels have an extremely poor toughness due to their brittleness and crystallization-induced chalking behavior, and this means that their practical applications have been limited . Elastic ceramic aerogels offer several advantages over traditional materials, including their lightweight and porous structure, high thermal insulation properties, and good resistance to high temperatures and harsh environments. − These unique properties make them ideal for a wide range of applications such as in aerospace, energy, and electronics industries. However, there are also some disadvantages associated with elastic ceramic aerogels.…”

Section: Introductionmentioning

confidence: 99%

Mechanically Robust Nanoporous Polyimide/Silica Aerogels for Thermal Superinsulation of Aircraft

Zhang

Wang

et al. 2023

ACS Appl. Nano Mater.

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Polyimide aerogels (PIAs) are thermally insulating materials that possess various advantages, such as exceptionally high temperature resistance and low thermal conductivity, which make them great potential candidate materials to be applied in the area of thermal protection. However, under harsh mechanical stresses, the macro- and microscopic structural stability of PIAs may be compromised due to shrinkage/collapse, leading to performance degradation. Herein, we propose a homogeneous organic/inorganic hybrid formation strategy for constructing nanoporous polyimide/silica aerogels (PIAs-A) with exceptional mechanical strength and ultralow thermal conductivity. The results obtained indicate that PIAs-A have an optimal three-dimensional nanoporous network structure with a pore size distribution mainly within the range of 10–20 nm. Monitoring the temperature evolution of the material’s cold surface showed that it remained at a low temperature of 37.5 °C even when the material was placed against a hot surface of 150 °C. The residual mechanical strengths of the aerogels remained at a superior level (with strength degradation being less than 9%) after exposure to ultralow and high-temperature atmospheres. Furthermore, compressive stress values at 3% strain exceeded previously reported values for PIAs by 625 and 733% at −50 and 100 °C, respectively. Meanwhile, our aerogels displayed flame resistance even when exposed to a heat source of approximately 1200 °C, possessed favorable hydrophobic properties, and maintained dimensional stability up to 504 °C. The robust mechanical and thermal insulation properties of PIAs-A make them a promising substitute material for thermal superinsulation in aircraft.

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“…The increasing energy challenges, emergency protection against thermal runaway, and fast improvement of aerospace engineering demand thermal insulators with high-temperature resistance effectiveness, and excellent chemical and thermal stability. − Ceramic aerogels are well-known for their wide range of characteristics, including minimal density, extremely low thermal conductivity, outstanding chemical stability, and a variety of functions, demonstrating the ideal potential to be employed as high-temperature thermal insulators. − Many reports have been devoted to preparing ceramic fiber aerogels (CFAs), which use flexible one-dimensional (1D) fibers as structural components in order to overcome the brittleness of conventional ceramic granular aerogels. , Hence, how to assemble 1D fibers on the three-dimensional (3D) macroscopic scale without sacrificing their mechanical and thermal properties is vital for fabricating lightweight, high mechanical performance, and excellent high-temperature thermal insulation materials.…”

Section: Introductionmentioning

confidence: 99%

“…8−12 Many reports have been devoted to preparing ceramic fiber aerogels (CFAs), which use flexible one-dimensional (1D) fibers as structural components in order to overcome the brittleness of conventional ceramic granular aerogels. 13,14 Hence, how to assemble 1D fibers on the three-dimensional (3D) macroscopic scale without sacrificing their mechanical and thermal properties is vital for fabricating lightweight, high mechanical performance, and excellent high-temperature thermal insulation materials.…”

Section: Introductionmentioning

confidence: 99%

Fiber Sedimentation and Layer-By-Layer Assembly Strategy for Designing Biomimetic Quasi-Ordered Mullite Fiber Aerogels as Extreme Conditions Thermal Insulators

Li,

Jiang,

Liu

et al. 2023

ACS Appl. Mater. Interfaces

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Ceramic fiber aerogels are attractive thermal insulating materials. In a thermomechanical coupling environment, however, they often show limited mechanical strength and considerably increased heat transfer which can lead to thermal runaway. In this paper, inspired by bird's nest and nacre, we demonstrate a sample strategy combining fiber sedimentation and layer-by-layer assembly to fabricate ultrastrong mullite fiber aerogels (MFAs) with quasi-ordered structures. The fibrous layers and fiber bridges are constructed in a fiber sedimentation self-assembly process. The fiber sedimentation technique optimizes the structure of the MFAs by regulating the fiber orientation. Owing to the quasi-ordered structure, the fabricated MFAs exhibit the integrated properties of high compression fatigue resistance, temperature-invariant compression resilience from −196 to 1300 °C, and low thermal conductivity (0.034 W•m −1 •K −1 ). By deliberately pressing multilayer MFAs into a thin paper, we substantially enhance the load-bearing capacity of the MFAs and achieve large temperature differences (563 °C) between the cold and hot surfaces by using a thin layer of MFAs (3−5 mm) under the simulated high-temperature (685 °C) and high-pressure (0.9 MPa) environment test. The combination of compression resistance, mechanical flexibility, and excellent thermal insulation provides an appealing material for efficient thermal insulation in extreme environments.

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Strong, superelastic and multifunctional SiC@ pyrolytic carbon nanofibers aerogels

Cited by 21 publications

References 33 publications

Down Fiber Reinforced Cellulose Nanofiber Aerogel toward Thermal Insulation and Pollutant Removal

Down Fiber Reinforced Cellulose Nanofiber Aerogel toward Thermal Insulation and Pollutant Removal

Mechanically Robust Nanoporous Polyimide/Silica Aerogels for Thermal Superinsulation of Aircraft

Fiber Sedimentation and Layer-By-Layer Assembly Strategy for Designing Biomimetic Quasi-Ordered Mullite Fiber Aerogels as Extreme Conditions Thermal Insulators

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