Growth mechanism and structure regulation of super-elastic SiC aerogels for thermal insulation and electromagnetic wave absorption

Yan, Mingyuan; Cheng, Xudong; Gong, Lunlun; Lun, Zhiyi; He, Pan; Shi, Long; Liu, Chenjie; Pan, Yuelei

doi:10.1016/j.cej.2023.146417

Cited by 32 publications

(3 citation statements)

References 56 publications

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“…This resulted in an EAB value of 3.14 GHz, illustrating a broadened absorption capacity. As evidenced in Figure 3b, the peak RL of RS-1500 consistently decreased as the matching thickness increased, aligning with the principles of the quarter-wavelength theory, which suggested that the maximum absorption occurred when the material's thickness corresponded to a quarter of the incident electro-magnetic wave's wavelength [28]. The dashed line in Figure 3b represents the minimum reflection loss at different matching thicknesses, corresponding to points on the quarterwavelength line one by one, in accordance with the quarter-wavelength theory.…”

Section: Ema Performance Of Rf/sio 2 Ceramic Particlessupporting

confidence: 75%

“…Additionally, XPS analysis was employed to investigate the chemical structure of the products obtained at different heat treatment temperatures, particularly quantitatively analyzing the structural changes of silicon elements at different heat treatment temperatures. As shown in Figure 1f-h, all three samples exhibited distinct O-Si-O peaks, indicating the formation of SiO 2 [28,33]…”

Section: Structural Control Of Rf/sio 2 Ceramic Particlesmentioning

confidence: 84%

“…The EMA capacity of RF/SiO 2 ceramic particles was evaluated via RL. RL could be calculated using Equations ( 1) and (2) [28]:…”

Section: Characterizationmentioning

confidence: 99%

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Effects of Heat Treatment on the Electromagnetic Wave Absorption Characteristics of Resorcinol Formaldehyde Silicon Dioxide Ceramic Particles

Zhang,

Ye,

et al. 2024

Materials

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In light of the pressing environmental and health issues stemming from electromagnetic pollution, advanced electromagnetic wave absorbing materials are urgently sought to solve these problems. The present study delved into the fabrication of the resorcinol formaldehyde (RF)/SiO2 ceramic particles using the sol–gel route. From SEM images and XRD and XPS analysis, it can be seen that the RF/SiO2 ceramic particles are successfully generated after heat treatment at 1500 °C. At room temperature, the sample treated at 1500 °C exhibited a minimum reflection loss of −47.6 dB in the range of 2–18 GHz when the matching thickness was 5.5 mm, showcasing strong attenuation capabilities. Moreover, these particles demonstrated a considerable effective electromagnetic wave absorption bandwidth of 3.14 GHz, evidencing their potential for wideband electromagnetic wave absorption. The temperature adjustment played a pivotal role in achieving optimal impedance matching. When the heat treatment temperature is increased from 800 °C to 1500 °C, the dielectric properties of the material are improved, thus achieving the best impedance matching, thereby optimizing the material’s absorption properties for specific frequency ranges, which makes it possible to customize the electromagnetic wave-absorbing characteristics to meet specific requirements across a range of applications.

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Section: Ema Performance Of Rf/sio 2 Ceramic Particlessupporting

confidence: 75%

Section: Structural Control Of Rf/sio 2 Ceramic Particlesmentioning

confidence: 84%

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Effects of Heat Treatment on the Electromagnetic Wave Absorption Characteristics of Resorcinol Formaldehyde Silicon Dioxide Ceramic Particles

Zhang,

Ye,

et al. 2024

Materials

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Mineral‐based Composite Phase Change Materials Assembled into 3D Ordered Aerogels for Efficient Wearable Filtration and Thermal Management

Li,

Zhao,

Tang

et al. 2024

Adv Funct Materials

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The emerging concept of aerogel composite phase change materials (PCMs) represents a promising approach for thermal energy storage and utilization. However, the thermal storage aerogels currently reported usually lack essential aerogel properties, thereby constraining their potential for functional design and advanced applications. Herein, multifunctional thermal storage aerogels with aerogel characteristics and thermoregulation performance are prepared by chemically crosslinking and unidirectional freezing to make functionalized mineral‐based composite PCMs as cavity walls. Thanks to the cross–linked continuous skeleton and retained hierarchical porous, this novel thermal storage aerogel possesses an 89.7% porosity and demonstrates excellent resilience under 80% compression. As the PCMs in the cavity walls can convert phonon transport modes through phase transitions, the thermal storage aerogel has enhanced thermal insulation properties, reaching a thermal conductivity of 29.6 mW m−1 K−1. Drawing upon the multifunctional properties of thermal storage aerogels, it is demonstrated that thermal storage masks with thermal comfort and health protection, as well as passive thermal management wrist guards capable of harnessing solar radiation for temperature regulation. This work encompasses the exploration of novel approaches in developing advanced thermal management materials to cater to the diverse thermal regulation requirements of PCMs across various domains.

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Multifunctional Anisotropic Aerogels for Intelligent Electromagnetic Wave Absorption

Yin,

Lin,

Wang

et al. 2024

Adv Funct Materials

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The rapidly developing modern society has higher requirements for intelligent electromagnetic wave absorbing (EMA) materials than ever before. Herein, lightweight, multifunctional metal‐free carbon‐based aerogels (RCPs) with a longitudinal honeycomb porous framework and a transverse neatly layered structure are obtained by heat‐treating graphene oxide/oxidized carbon nanotubes/hexachlorocyclotriphosphazene complex to simultaneously achieve the tunable EMA, flame retardancy, and thermal insulation. The anisotropic structure ensures the tunable properties of the carbon aerogels along with tilt angles according to environmental needs. The honeycomb porous structure effectively promotes multiple reflections and scatterings of electromagnetic waves compared with the layered structure, maximizing the penetration inside the material and thus a high EMA performance. The optimized R10C2P‐4 exhibits a minimum reflection loss in the longitudinal direction of−61.5 dB, while the value is as low as −22.4 dB in the transverse direction. Furthermore, the porous structure adequately inhibits the spread of heat, accompanied by the phosphorus species induced by hexachlorocyclotriphosphazene pyrolysis, endowing a good flame retardancy and thermal insulation with a low thermal conductivity of 20.6 mW m−1 K−1 in the longitudinal direction, rather than the transverse direction. This work provides an ingenious insight into the design of multifunctional EMA materials, adapting flexibly to various application requirements.

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Growth mechanism and structure regulation of super-elastic SiC aerogels for thermal insulation and electromagnetic wave absorption

Cited by 32 publications

References 56 publications

Effects of Heat Treatment on the Electromagnetic Wave Absorption Characteristics of Resorcinol Formaldehyde Silicon Dioxide Ceramic Particles

Effects of Heat Treatment on the Electromagnetic Wave Absorption Characteristics of Resorcinol Formaldehyde Silicon Dioxide Ceramic Particles

Mineral‐based Composite Phase Change Materials Assembled into 3D Ordered Aerogels for Efficient Wearable Filtration and Thermal Management

Multifunctional Anisotropic Aerogels for Intelligent Electromagnetic Wave Absorption

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