Preparation of monolithic Al2O3–SiO2 aerogels with high-temperature resistance using boehmite nanorods

Ren, Yuhan; Zhang, Biao; Ye, Jian; Zhong, Zhaoxin; Zhang, Jiawei; Ye, Feng

doi:10.1016/j.ceramint.2024.03.009

Cited by 5 publications

(1 citation statement)

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“…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: 86%

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: Structural Control Of Rf/sio 2 Ceramic Particlesmentioning

confidence: 86%