Three-Dimensional Graphene Hybrid SiO2 Hierarchical Dual-Network Aerogel with Low Thermal Conductivity and High Elasticity

Zhang, Liwei; He, Peng; Song, Kunkun; Zhang, Jingxiang; Zhang, Baoqiang; Huang, Robin) Hui; Zhang, Qiangqiang

doi:10.3390/coatings10050455

Cited by 13 publications

(5 citation statements)

References 31 publications

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“…The elastic moduli of present 3D hybrid structures range between 3 and 13 MPa, and can be contrasted with the E of 0.07 MPa reported for a silica-GO aerogel with 40 wt.% GO and density of 0.015 g•cm -3 [78] or the value of 0.4 MPa referred for a porous silica-GO material with a 5 wt.% of GO and a density of 0.15 g•cm -3 [42].…”

Section: J O U R N a L P R E -P R O O Fcontrasting

confidence: 78%

Robust and conductive mesoporous reduced graphene oxide-silica hybrids achieved by printing and the sol gel route

Moyano

Loizillon

Pérez-Coll

et al. 2021

Journal of the European Ceramic Society

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Section: J O U R N a L P R E -P R O O Fcontrasting

confidence: 78%

Robust and conductive mesoporous reduced graphene oxide-silica hybrids achieved by printing and the sol gel route

Moyano

Loizillon

Pérez-Coll

et al. 2021

Journal of the European Ceramic Society

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“…(2) The robust and interconnected porous architecture, which can distribute the induced thermal stress very well 31 . (3) The formation of SiO 2 layer on the surface of SiCNWs due to passive oxidation leads to a synergetic protection of the inner region from further oxidation 32 …”

Section: Resultsmentioning

confidence: 99%

“…31 (3) The formation of SiO 2 layer on the surface of SiCNWs due to passive oxidation leads to a synergetic protection of the inner region from further oxidation. 32 The thermal conductivity and maximum allowed working temperatures of typical thermal insulating materials have been summarized in Figure 5F. Compared to ultralight networks made of polymers, 33 cellulosebased composites, 34 carbon, 35 conventional SiO 2 fiber, 36 and fiberglass wool 37 that either suffer from poor hightemperature stability or inflammability, the present SiCNWs sponges offer a combination of low thermal conductivity and high maximum allowed working temperatures up to 1300 • C, making them promising candidate as thermal insulator or harsh-environment applications.…”

Section: Thermal Insulation Performance and Fire-retardancementioning

confidence: 99%

Multifunctional ultralight, recoverable, piezoresistive, and super thermal insulating SiC nanowire sponges

et al. 2022

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Ultralight three-dimensional (3D) architectured silicon carbide (SiC) nanowire sponges with integrated properties of recoverable compressibility, outstanding high-temperature thermal and chemical stability, and fire-retardance have been actively pursued in recent years. However, efficient construction of SiC nanowire sponges with well-controlled overall shapes and distribution of SiC nanowires remains challenging. Herein, by coupling the electrospinning technique and carbothermal reduction process, we have developed a new fabrication process for highly porous and free-standing 3D SiC nanowire (SiCNW) sponges with closely attached nanowires through thermal treatment of stacked electrospun PAN/SiO 2 nanofiber membranes. The resulting SiCNW sponges possess ultralow density (∼29 mg cm −3 ), excellent compressive recoverability from large compressive deformation (up to 40% strain), and fatigue resistance, which endow them with excellent piezoresistive sensing capability under a variety of complex conditions. Furthermore, the sponges display superb thermal insulation (thermal conductivity of 24 mW m −1 K −1 ) and fire-retardance. We believe that the present process provides technical clues for the development of other multifunctional ceramic sponges, and that further development of these ultralight multifunctional ceramic sponges offers potential for the design of advanced components for application in harsh engineering environments.

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“…Therefore, the sufficient bending stiffness of cell walls is a crucial factor in achieving superelastic. [ 18c,100 ] Introducing heterogeneous components, such as CNTs, [ 101 ] ceramic, [ 102 ] and polymers, [ 103 ] is a proven approach for increasing inter‐sheet interactions and improving cell‐walls’ yield stress. In addition, the well‐organized frameworks that can promote effective load transfer among structural units, such as cellular structure [ 104 ] and lamellar structure, [ 105 ] are equally critical to aerogels’ superelasticity.…”

Section: Structural Engineering Of 3d Adiabatic Casmentioning

confidence: 99%

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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Three-Dimensional Graphene Hybrid SiO2 Hierarchical Dual-Network Aerogel with Low Thermal Conductivity and High Elasticity

Cited by 13 publications

References 31 publications

Robust and conductive mesoporous reduced graphene oxide-silica hybrids achieved by printing and the sol gel route

Robust and conductive mesoporous reduced graphene oxide-silica hybrids achieved by printing and the sol gel route

Multifunctional ultralight, recoverable, piezoresistive, and super thermal insulating SiC nanowire sponges

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

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