Recent Progress in Electromagnetic Absorbing Materials

Mishra, Raghvendra Kumar; Dutta, Aastha; Mishra, Prachi; Thomas, Sabu

doi:10.1002/9781119128625.ch7

Cited by 11 publications

(10 citation statements)

References 91 publications

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“…XRD analyses indicate that the as-synthesized HE TMC-2 with the exclusion of Ti element compared with HE TMC-1 still exhibits phase segregation, while the incorporation of Cr element in HE TMC-3 boosts the formation of single-phase solid solution. The theoretical density of HE TMC-3 is determined as 10.41 g/cm 3 , which exhibits lower density compared with broadband transition metal carbide absorbers including HfC and TaC. Through SEM analyses, the incorporation of Cr element leads to significant growth of particle size, which can further decrease the dielectric loss capability.…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, however, it leads to the limited solid solution quantity of CrC. Through Rietveld refinement, the lattice parameter (a) of HE TMC-3 is determined to be 4.5488 Å, and the theoretical density (ρ) of HE TMC-3 based on ICP-AES results is calculated to be 10.41 g/cm 3 , which is effectual in lowering the density compared with HfC (12.6 g/cm 3 ) and TaC (14.6 g/cm 3 ). Figure 4 illustrates the morphologies of HE TMC-2 (TM = Zr, Hf, Nb, Ta) and HE TMC-3 (TM = Cr, Zr, Hf, Nb, Ta) powders.…”

Section: Synthesis and Characterization Of He Tmcsmentioning

confidence: 99%

“…6(d), HE TMC-3 exhibits the magnetic loss tangent comparable to the dielectric loss tangent across the testing frequency span, with dielectric loss dominating over 13-17 GHz and magnetic loss dominating over the rest frequency ranges. Considering that the resonance loss capacity of HE TMC-3 is mainly originated from the d-orbital splitting and the electron paramagnetic resonance, HE TMC-3 is expected to maintain high magnetic loss capacity at high temperatures [3,20]. Notably, decreasing the dielectric loss capacity and increasing the magnetic loss capacity in the meantime are helpful in optimizing the impedance match for dielectric loss-type EM wave absorbers with good conductivity, e.g., carbon nanotubes (CNTs) [11], TMCs [26], transition metal diborides (TMB 2 s) [48], highentropy alloys [49,50], etc.…”

Section: Em Properties Of He Tmc Powdersmentioning

confidence: 99%

“…The ever-growing demands for communication capacity which possess superior applicability across wide frequency bands [3][4][5][6]. Thus, there have been intense research efforts in exploiting effectual strategy for designing ultra-broadband EM wave absorbers [7][8][9].…”

Section: Introduction mentioning

confidence: 99%

“…However, the complex experimental procedures and the difficulty in precisely controlling the nanostructure and dispersibility of nanofillers are the main drawbacks of this paradigm. Besides, the magnetic loss capability derived from magnetic nanofillers may come across a sudden reduction over the Curie or Neel temperature [3]. Moreover, unsatisfied thermal stability and oxidation resistance are also unneglectable issues for high-temperature applications [20].…”

Section: Introduction mentioning

confidence: 99%

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Achieving ultra-broadband electromagnetic wave absorption in high-entropy transition metal carbides (HE TMCs)

et al. 2022

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Electronic devices pervade everyday life, which has triggered severe electromagnetic (EM) wave pollution. To face this challenge, developing EM wave absorbers with ultra-broadband absorption capacity is critically required. Currently, nano-composite construction has been widely utilized to realize impedance match and broadband absorption. However, complex experimental procedures, limited thermal stability, and interior oxidation resistance are still unneglectable issues. Therefore, it is appealing to realize ultra-broadband EM wave absorption in single-phase materials with good stability. Aiming at this target, two high-entropy transition metal carbides (HE TMCs) including (Zr,Hf,Nb,Ta)C (HE TMC-2) and (Cr,Zr,Hf,Nb,Ta)C (HE TMC-3) are designed and synthesized, of which the microwave absorption performance is investigated in comparison with previously reported (Ti,Zr,Hf,Nb,Ta)C (HE TMC-1). Due to the synergistic effects of dielectric and magnetic losses, HE TMC-2 and HE TMC-3 exhibit better impedance match and wider effective absorption bandwidth (EAB). In specific, the exclusion of Ti element in HE TMC-2 endows it optimal minimum reflection loss (RLmin) and EAB of −41.7 dB (2.11 mm, 10.52 GHz) and 3.5 GHz (at 3.0 mm), respectively. Remarkably, the incorporation of Cr element in HE TMC-3 significantly improves the impedance match, thus realizing EAB of 10.5, 9.2, and 13.9 GHz at 2, 3, and 4 mm, respectively. The significance of this study lays on realizing ultra-broadband capacity in HE TMC-3 (Cr, Zr, Hf, Nb, Ta), demonstrating the effectiveness of high-entropy component design in tailoring the impedance match.

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Section: Discussionmentioning

confidence: 99%

Section: Synthesis and Characterization Of He Tmcsmentioning

confidence: 99%

Section: Em Properties Of He Tmc Powdersmentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

Section: Introduction mentioning

confidence: 99%

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Achieving ultra-broadband electromagnetic wave absorption in high-entropy transition metal carbides (HE TMCs)

et al. 2022

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Fundamental Theory of Electromagnetic Spectrum, Dielectric and Magnetic Properties, Molecular Rotation, and the Green Chemistry of Microwave Heating Equipment

Mishra,

Yadav,

Mishra

et al. 2024

Green Chemical Synthesis With Microwaves and Ultrasound

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Graphene Nanoplatelets/Barium Titanate Polymer Nanocomposite Fibril: A Remanufactured Multifunctional Material with Unprecedented Electrical, Thermomechanical, and Electromagnetic Properties

Mishra,

Goel,

Chianella

et al. 2023

Advanced Sustainable Systems

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A novel, zero‐waste and recycling plastic waste solution is introduced, to scalably produce graphene nanoplatelets/barium titanate (GNP/BaTiO3) polymer nanocomposite fibrils. A comprehensive investigation is performed to evaluate the compatible and non‐compatible recycled polypropylene (PP)/polyethyleneterephthalate (PET) blends combined with functional (electrical, piezoelectric,and dielectric) materials for in‐situ fibril production. The nanocompositefibrils made from recycled PP, PET and GNPs/BaTiO3 with high‐aspect ratio disparity (400:1) are produced, which exhibit significantly enhanced electrical, thermomechanical, and electromagnetic characteristics. Single‐screw extrusion is utilised to fabricate the fibrils with the in‐situ fibril morphology of PET and GNPs/BaTiO3 leading to improved electrical conductivity. It is demonstrated that such fibril morphology restricts the chain mobility of polymer molecules, and ultimately increases viscosity and strain energy. Moreover, the study demonstrates a positive reinforcement effect from the utilisation of PET fibrils and GNPs/BaTiO3 in a PP matrix, dominated by the high‐aspect ratio, stiffness, and thermal stability of GNPs/BaTiO3. Furthermore, it is observed that the mechanical properties and tension‐bearing capacity of the PP are significantly improved by such incorporation. The study also demonstrates that the protection of the remanufactured nanocomposites against electromagnetic interference is significantly improved with the increasing GNPs/BaTiO3 content and the morphological transition from spherical to fibril‐shaped PET.

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Recent Progress in Electromagnetic Absorbing Materials

Cited by 11 publications

References 91 publications

Achieving ultra-broadband electromagnetic wave absorption in high-entropy transition metal carbides (HE TMCs)

Achieving ultra-broadband electromagnetic wave absorption in high-entropy transition metal carbides (HE TMCs)

Fundamental Theory of Electromagnetic Spectrum, Dielectric and Magnetic Properties, Molecular Rotation, and the Green Chemistry of Microwave Heating Equipment

Graphene Nanoplatelets/Barium Titanate Polymer Nanocomposite Fibril: A Remanufactured Multifunctional Material with Unprecedented Electrical, Thermomechanical, and Electromagnetic Properties

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