Porous structure of coals from the usinsk deposit in the Pechora Coal Basin

Ismagilov, Z. R.; Shikina, N. V.; Zhuravleva, N. V.; Potokina, R. R.; Teryaeva, T. N.; Керженцев, М. А.

doi:10.3103/s0361521914040053

Cited by 9 publications

(1 citation statement)

References 23 publications

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“…Coal has a typical porous structure [ 18 ]. It has many oxygen-containing functional groups and graphite microcrystalline structures [ 19 ], which can provide dipole polarization and dielectric loss to promote microwave absorption.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Microwave Absorption Properties of Core-Shell Structure Nanocomposite Based on Modified Anthracite Coal

Zhang

Zhou

et al. 2023

Nanomaterials

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Microwave-absorbing materials have attracted extensive attention due to the development of electronic countermeasures. In this study, novel nanocomposites with core–shell structures based on the core of Fe-Co nanocrystals and the shell of furan methylamine (FMA)-modified anthracite coal (Coal-F) were designed and fabricated. The Diels-Alder (D-A) reaction of Coal-F with FMA creates a large amount of aromatic lamellar structure. After the high-temperature treatment, the modified anthracite with a high degree of graphitization showed an excellent dielectric loss, and the addition of Fe and Co effectively enhanced the magnetic loss of the obtained nanocomposites. In addition, the obtained micro-morphologies proved the core–shell structure, which plays a significant role in strengthening the interface polarization. As a result, the combined effect of the multiple loss mechanism promoted a remarkable improvement in the absorption of incident electromagnetic waves. The carbonization temperatures were specifically studied through a setting control experiment, and 1200 °C was proved to be the optimum parameter to obtain the best dielectric loss and magnetic loss of the sample. The detecting results show that the 10 wt.% CFC-1200/paraffin wax sample with a thickness of 5 mm achieves a minimum reflection loss of −41.6 dB at a frequency of 6.25 GHz, indicating an excellent microwave absorption performance.

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Section: Introductionmentioning

confidence: 99%