Modulation of electromagnetic absorption and shielding properties of geopolymer nanocomposites by designing core–shell structure of carbon nanotubes

Zhu, Yong; Niu, Mengting; Ding, Enjie; Bi, Sheng; Liu, Wanshuang; Sun, Lei; Zhang, Ling

doi:10.1016/j.ceramint.2022.05.292

Cited by 19 publications

(11 citation statements)

References 46 publications

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“…18 The modified SiO 2 @CNT hybrid filler also displays typical diffraction peaks at the 26 and 42.5 positions, but the SiO 2 @CNT filler exhibits a significantly lower peak at 26 and a slight increase in the maximum half-peak (FWHM) compared to the unmodified CNT filler, representing, to some extent, a change in chemical composition. 19 The surface features of SiO 2 @CNT and CNT are further demonstrated in Raman spectra. As seen in Figure 1C, the intense peaks located at 1342 and 1575 cm À1 in CNT represent the D-peak (disordered vibrational peak) and G-peak (ordered vibrational peak) of CNT, respectively.…”

Section: Resultsmentioning

confidence: 92%

Enhancement of dielectric properties of acrylic resin elastomer‐based composites with SiO₂ loaded carbon nanotubes

Ma,

Wang,

Yang

et al. 2024

Polymer Composites

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The inherent balance between dielectric constant and loss restricts the actual usage of dielectric elastomer actuators with high actuation strains, proposing a method that can break this trade‐off has been an urgent query. In this work, silica‐loaded carbon nanotubes (called SiO2@CNT) were prepared as dopants for acrylic resin elastomers (abbreviated as ARE) using the sol–gel method, and the obtained SiO2@CNT/ARE composites reached a dielectric constant of 282.5 at 100 Hz at a filler content of 3.22 vol%, which is 86 times higher than that of the pure ARE, whereas the dielectric loss remains at 0.17. The equilibrium between dielectric constant and loss is broken mainly based on the loading of SiO2 which inhibits the formation of carbon nanotube conductive network and concurrently reinforces the compatibility of the filler with ARE. Such a design offers a generalizable strategy for the subsequent preparation of polymer‐based composite films with excellent dielectric properties.Highlights Preparation of fillers with excellent dispersibility in the organic phase. The ARE‐based composites exhibit excellent dielectric properties at 100 Hz. The mechanism of increase in dielectric constant is explained using two models.

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Section: Resultsmentioning

confidence: 92%

Enhancement of dielectric properties of acrylic resin elastomer‐based composites with SiO₂ loaded carbon nanotubes

Ma,

Wang,

Yang

et al. 2024

Polymer Composites

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“…The abundant MXene/PI heterointerfaces and the functional groups on the MXene nanosheets were beneficial for providing interfacial polarization loss and dipolar polarization loss. In addition, the straight-line tail corresponding to conduction loss 38 was clearly observed in the Cole–Cole curve of HT-PI/MXene-S, revealing that conduction loss played a vital role in dielectric loss at high temperature.…”

Section: Resultsmentioning

confidence: 92%

Microstructure controllable polyimide/MXene composite aerogels for high-temperature thermal insulation and microwave absorption

et al. 2023

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“…μ r and ε r are the relative permeability and permittivity, respectively, c is the EM wave velocity in free space, f is the frequency of the incident EM wave and d is the sample thickness. The neat GP exhibited poor MA performance 26 . However, the incorporation of .5 vol% h‐Fe 3 O 4 endowed the GP composites with remarkable absorption properties.…”

Section: Resultsmentioning

confidence: 99%

“…The neat GP exhibited poor MA performance. 26 However, the incorporation of .5 vol% h-Fe 3 O 4 endowed the GP composites with 4D). These results confirmed that the MA capability of the GP composites can be improved by modifying the structure of Fe 3 O 4 particles into hollow structures and reducing their sizes.…”

Section: Resultsmentioning

confidence: 99%

Enhanced microwave absorption performance of geopolymer composites by incorporating hollow Fe₃O₄ nanospheres

Ding,

Bai,

Wang

et al. 2023

Int J Applied Ceramic Tech

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Hollow Fe3O4 nanospheres (h‐Fe3O4) with tunable sizes were synthesized and proposed as fillers to prepare microwave absorbing geopolymer (GP) composites. We studied the effect of different sizes of h‐Fe3O4 on microwave absorption (MA). The MA performance was enhanced as the size of h‐Fe3O4 in GP decreased. Furthermore, the GP composites containing h‐Fe3O4 achieved better MA capability than their counterparts containing solid Fe3O4 nanospheres (s‐Fe3O4) of the same size. The GP composites with a small size of h‐Fe3O4 exhibited the best minimum reflection loss (RLmin) of −39.3 dB at 14.0 GHz and an effective absorption bandwidth (EAB) of 4.8 GHz at 2.2 mm. The outstanding MA capability, possibly as a result of improved dielectric loss and magnetic loss together with well‐matched impedance, demonstrated that GP composites are competitive construction materials when MA is critical. The radar cross section (RCS) simulation was conducted to assess the MA performance of composite materials in practical environments.

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Modulation of electromagnetic absorption and shielding properties of geopolymer nanocomposites by designing core–shell structure of carbon nanotubes

Cited by 19 publications

References 46 publications

Enhancement of dielectric properties of acrylic resin elastomer‐based composites with SiO₂ loaded carbon nanotubes

Enhancement of dielectric properties of acrylic resin elastomer‐based composites with SiO₂ loaded carbon nanotubes

Microstructure controllable polyimide/MXene composite aerogels for high-temperature thermal insulation and microwave absorption

Enhanced microwave absorption performance of geopolymer composites by incorporating hollow Fe₃O₄ nanospheres

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Modulation of electromagnetic absorption and shielding properties of geopolymer nanocomposites by designing core–shell structure of carbon nanotubes

Cited by 19 publications

References 46 publications

Enhancement of dielectric properties of acrylic resin elastomer‐based composites with SiO2 loaded carbon nanotubes

Enhancement of dielectric properties of acrylic resin elastomer‐based composites with SiO2 loaded carbon nanotubes

Microstructure controllable polyimide/MXene composite aerogels for high-temperature thermal insulation and microwave absorption

Enhanced microwave absorption performance of geopolymer composites by incorporating hollow Fe3O4 nanospheres

Contact Info

Product

Resources

About

Enhancement of dielectric properties of acrylic resin elastomer‐based composites with SiO₂ loaded carbon nanotubes

Enhancement of dielectric properties of acrylic resin elastomer‐based composites with SiO₂ loaded carbon nanotubes

Enhanced microwave absorption performance of geopolymer composites by incorporating hollow Fe₃O₄ nanospheres