Investigation on textural and structural evolution of the novel crack-free equimolar Al2O3-SiO2-TiO2 ternary aerogel during thermal treatment

Wu, Xiaodong; Li, Wei; Shao, Gaofeng; Shen, Xiaodong; Cui, Sheng; Zhou, Jie; Wei, Yang; Chen, Xiangbao

doi:10.1016/j.ceramint.2016.12.044

Cited by 21 publications

(7 citation statements)

References 35 publications

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“…This inefficient structure continuity inherently leads to the brittleness nature of nanoparticle-based ceramic aerogels. − In addition, owing to the high surface energy of small nanoparticles, the serious particle agglomeration and pore collapse under high temperatures may result in catastrophic failure for aerogels including structural cracks, strength degradation, volume shrinkage, and even complete loss of thermal insulation. Up to now, most of nanoparticle-based ceramic aerogels cannot tolerate heat treatment above 1100 °C in air without structure degradation. − …”

Section: Introductionmentioning

confidence: 99%

Insulating and Robust Ceramic Nanorod Aerogels with High-Temperature Resistance over 1400 °C

Zhang

et al. 2021

ACS Appl. Mater. Interfaces

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Ceramic aerogels, which present a unique combination of low thermal conductivity and excellent high-temperature stability, are attractive for thermal insulation under extreme conditions. However, most ceramic aerogels are constructed by oxide ceramic nanoparticles and thus are usually plagued by their brittleness and structural collapse at elevated temperatures (less than 1000 °C). Despite great progress achieved in this regard recently, it still remains a big challenge to design and fabricate intriguing ceramic aerogels with enhanced mechanical strength and remarkable thermal stability at ultrahigh temperature up to 1400 °C. To this end, we herein report a facile and scalable strategy to manufacture ceramic nanorod aerogels (CNRAs) with hierarchically macroporous and mesoporous structures by the controllable assembly of Al2O3 nanorods and SiO2 nanoparticles. Subsequently, the high-temperature annealing treatment of CNRAs significantly maximizes mechanical strength and promotes thermal tolerance. The obtained CNRAs demonstrate the integrated properties of super-strong heat resistance (up to 1400 °C), low thermal conductivity (0.026 W/m·K at 25 °C and 0.089 W/m·K at 1200 °C), high mechanical robustness (compressive strength 1.5 MPa), and low density (0.146 g/cm3). We envision that this novel nanorod-assembled ceramic aerogels offer considerable advantages than most of the state-of-the-art ceramic aerogels for thermal superinsulation upon exposure to extremely harsh environments.

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Section: Introductionmentioning

confidence: 99%

Insulating and Robust Ceramic Nanorod Aerogels with High-Temperature Resistance over 1400 °C

Zhang

et al. 2021

ACS Appl. Mater. Interfaces

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“…Figure 5 shows the SEM images of the PI aerogels with different polymer concentrations and n values. It is well-known that the microstructures of the oxide aerogels, 42 such as silica, alumina, and titanium, which present the 3D network structures formed with the interconnection of nanoparticles (2−10 nm). Intriguingly, the as-synthesized PI aerogels consist of a 3D network of polymer nanofibers tangled together with fiber diameters ranging from 15 to 50 nm.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Preparation and Characterization of Polyimide Aerogels with a Uniform Nanoporous Framework

Zhong¹,

Kong²,

Chen³

et al. 2018

Langmuir

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Polyimide (PI) aerogels were successfully synthesized via a straightforward sol-gel process under room temperature along with the supercritical CO drying method using 4-amino- N-methylbenzamide and 3,3',4,4'-biphenyltetracarboxylic dianhydride. 1,3,5-Triaminophenoxybenzene was used as the cross-linker. The chemical structure, pore structure, morphology, thermal performance, CO adsorption, and mechanical performance of PI aerogels were investigated. The as-prepared PI aerogels had low bulk densities (0.091-0.167 g/cm), low shrinkages (9.73-17.36%), low thermal conductivities (0.0307-0.0341 W/m·K), high specific surface areas (449.76-538.19 m/g), small pore diameter (10.37-22.41 nm), high thermal stability (onset of decomposition above 560 °C), and excellent mechanical property. The CO adsorption capacities of PI aerogels were substantially higher than the values of the previous porous materials reported under the similar conditions, and the CO uptake capacity was as high as 31.19 cm/g at 25 °C and 1.0 bar. The resulting PI aerogels could be potentially used as thermal insulators and CO adsorbents.

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“…7,8 In addition, oxide ceramic nanoparticles have a tendency to undergo grain growth and phase transformation in high-temperature environments, thus resulting in catastrophic failure of ceramic aerogels. [9][10][11] Consequently, there is a compelling need to explore advanced ceramic aerogels with high stability and low thermal conductivity for thermal insulation applications under high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Biomass-derived lightweight SiC aerogels for superior thermal insulation

Zheng,

Li,

et al. 2024

Nanoscale

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Investigation on textural and structural evolution of the novel crack-free equimolar Al2O3-SiO2-TiO2 ternary aerogel during thermal treatment

Cited by 21 publications

References 35 publications

Insulating and Robust Ceramic Nanorod Aerogels with High-Temperature Resistance over 1400 °C

Insulating and Robust Ceramic Nanorod Aerogels with High-Temperature Resistance over 1400 °C

Preparation and Characterization of Polyimide Aerogels with a Uniform Nanoporous Framework

Biomass-derived lightweight SiC aerogels for superior thermal insulation

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