Robust and thermostable C/SiOC composite aerogel for efficient microwave absorption, thermal insulation and flame retardancy

Yang, Dongdong; Dong, Shun; Xin, Jianqiang; Liu, Chen; Hu, Peitao; Xia, Liansen; Hong, Changqing; Zhang, Xinghong

doi:10.1016/j.cej.2023.143851

Cited by 15 publications

(4 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…49 Carbon, serving as an infrared shading agent, has the distinctive ability of infrared absorption, which can greatly reduce radiation conduction at high temperatures. 50 Furthermore, ZrC possesses the characteristic of reflecting infrared rays exceeding 2 μm, resulting in low radiation conduction at high temperatures. Finally, a large number of interfaces between grain boundaries or between ZrC nanofibers can enhance phonon scattering, thereby increasing the interfacial thermal resistance.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…As for components, heat transfer at high temperatures is mainly thermal radiation, and the wavelength of thermal radiation at 300–1300 K is mainly 2.5–8 μm according to Wien displacement law . Carbon, serving as an infrared shading agent, has the distinctive ability of infrared absorption, which can greatly reduce radiation conduction at high temperatures . Furthermore, ZrC possesses the characteristic of reflecting infrared rays exceeding 2 μm, resulting in low radiation conduction at high temperatures.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

High Temperature Thermal Insulation Ceramic Aerogels Fabricated from ZrC Nanofibers Welded with Carbon Nanoparticles

Xu,

Zhao,

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Ceramic aerogels exhibit great potential in thermal insulation due to their ultralow density, high porosity, ultralow thermal conductivity, and good chemical stability. However, the application of traditional oxide ceramic aerogels in extreme environments is limited. Herein, we proposed an ultra-high temperature ceramic (UHTC) aerogel designed by ZrC nanofibers welded with carbon nanoparticles. Among them, the flexible ZrC nanofibers, as basic 1D assembly blocks, were assembled into a stable 3D porous structure through the carbon nanoparticles converted by the resorcinol formaldehyde resin (RF). The obtained multiscale fibrous framework endows aerogel with ultralow density (0.0133−0.0282 g cm −3 ), high porosity (99.73−99.07%), good compressive strength (0.7−18.9 kPa), ultralow thermal conductivity (0.185−0.249 W m −1 K −1 ), and high-temperature stability at 1400 °C under vacuum. These comprehensive properties can be tailored by adjusting the RF content. The study provides promising perspectives for ZrC nanofiber aerogels in high-temperature insulation applications.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

High Temperature Thermal Insulation Ceramic Aerogels Fabricated from ZrC Nanofibers Welded with Carbon Nanoparticles

Xu,

Zhao,

et al. 2024

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…This requires coordinated impedance matching and attenuation constants for the EMA materials. The attenuation constant (α) is a key element affecting the EMW absorption properties of a material, which can be obtained by calculating the following equation: α = 2 π f c false( ε ″ μ ″ − ε ′ μ ′ false) + false( ε ″ μ ″ − ε ′ μ ′ ) 2 false( ε ″ μ ″ + ε ′ μ ′ ) 2 where the larger the values of ε ” and μ ” , the larger the α, the larger the corresponding loss value. As shown in Figure d, the attenuation constants of all materials showed an upward trend in the 2–18 GH value range, where V 2 C-100 °C-1 had a suitable α value.…”

Section: Resultsmentioning

confidence: 99%

V-Based MXene/MAX Heterostructure Composites with Enhancing Dielectric Loss for Broadband Microwave Absorption

Cui,

Li,

Zhang

et al. 2024

Inorg. Chem.

View full text Add to dashboard Cite

Electromagnetic wave absorption performance is strictly dependent on attenuation and impedance matching, which are directly influenced by the ratio of MXene/MAX in the multilayer structured MXene/MAX composites. However, there is still a challenge to achieve collaborative optimization of dielectric loss and impedance matching by precisely regulating the proportional relationship of MXene/MAX. Herein, V-based MXene/MAX heterostructure composites with different V 2 C/V 2 AlC ratios were successfully synthesized by rationally controlling the temperature and time of the hydrothermal reaction. Experimental results indicated that V 2 C-100 °C-1 harvested the balance between reduced impedance matching and enhanced dielectric losses, which was attributed to the mildly enhanced conduction loss and polarization loss. The first principles indicated that abundant electrons migrate from the V atoms of the MXene to the C atoms of the MAX phase. The charge redistributed and accumulated at the interface, exciting the increase in the dielectric loss of V 2 C-100 °C-1. As a result, the V 2 C-100 °C-1 heterostructure composite had an excellent electromagnetic absorption effect with a minimum reflection loss of −50.06 dB and a wide effective absorption bandwidth of 4.0 . This work provides a valuable experience for the development of efficient MXene-based microwave absorbing materials.

show abstract

“…The presence of numerous heterogeneous interfaces and defects in C/SiOC composite aerogels would substantially enhance the EM wave absorption of carbon fiber materials. [34] Besides, 3D needle-punched carbon fiber felts with a laminated architecture feature a lightweight structure and contribute to the thermal insulation performance of the material in the thickness direction. [28] The effective composite of carbon and SiOC materials combined with an ingenious structural design makes it possible to solve the above problems.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Carbon Fiber Reinforced C/SiOC Aerogel Composites for Efficient Electromagnetic Wave Absorption, Thermal Insulation, and Flame Retardancy

Yang,

Dong,

Cui

et al. 2023

Small

Self Cite

View full text Add to dashboard Cite

Carbon fiber composites have great application prospects as a potential electromagnetic (EM) wave‐absorbing material, yet it remains extremely challenging to integrate multiple functions of EM wave absorption, mechanical strength, thermal insulation, and flame retardancy. Herein, a novel carbon fiber reinforced C/SiOC aerogel (CF/CS) composite is successfully prepared by sol‐gel impregnation combined with an ambient drying process for the first time. The density of the obtained CF/CS composites can be controlled just by changing sol‐gel impregnation cycles (original carbon fiber felt (S0), and samples with one (S1) and two (S2) impregnation cycles are 0.249, 0.324, and 0.402 g cm−3, respectively), allowing for efficient tuning of their properties. Remarkably, S2 displays excellent microwave absorption properties, with an optimal reflection loss of ‐65.45 dB, which is significantly improved than S0 (‐10.90 dB). Simultaneously, compared with S0 (0.75 and 0.30 MPa in the x/y and z directions), the mechanical performance of S2 is dramatically improved with a maximum compressive strength of 10.37 and 4.93 MPa in the x/y and z directions, respectively. Moreover, CF/CS composites show superior thermal insulation capability than S0 and obtain good flame‐retardant properties. This work provides valuable guidance and inspiration for the development of multifunctional EM wave absorbers.

show abstract

Robust and thermostable C/SiOC composite aerogel for efficient microwave absorption, thermal insulation and flame retardancy

Cited by 15 publications

References 59 publications

High Temperature Thermal Insulation Ceramic Aerogels Fabricated from ZrC Nanofibers Welded with Carbon Nanoparticles

High Temperature Thermal Insulation Ceramic Aerogels Fabricated from ZrC Nanofibers Welded with Carbon Nanoparticles

V-Based MXene/MAX Heterostructure Composites with Enhancing Dielectric Loss for Broadband Microwave Absorption

Multifunctional Carbon Fiber Reinforced C/SiOC Aerogel Composites for Efficient Electromagnetic Wave Absorption, Thermal Insulation, and Flame Retardancy

Contact Info

Product

Resources

About