In situ growth of CoNi bimetallic alloys inside polyetheretherketone-derived hierarchical porous carbon as a broadband and efficient electromagnetic wave absorber

Abstract

Both morphological structure and chemical composition are the important factors that determine the electromagnetic wave (EMW) absorption properties of EMW absorbers. Herein, hierarchical porous carbon (HPPC) was synthesized by using...

Highly Flexible Hydrogels with Readily Adjustable Electromagnetic Parameter for Efficient Electromagnetic Wave Absorption

“…The absorption properties of materials in electromagnetic fields mainly depend on two essential parameters: complex relative permittivity (ε r = ε′ – j ε″) and complex relative permeability (μ r = μ′ – j μ″). Thereinto, the real part (ε′, μ′) and the imaginary part (ε′′, μ′′) represent the storage and dissipation capabilities of electromagnetic energy, respectively. , Besides, dielectric loss tangent (tan δ ε = ε″/ε′) and magnetic loss tangent (tan δ μ = μ″/μ′) are also widely used to characterize the dielectric and magnetic loss ability . To evaluate the EMW absorption properties of DHBHs, ε′, ε″, μ′, and μ′′ in 12.40–18.00 GHz were measured.…”

“…Thereinto, the real part (ε′, μ′) and the imaginary part (ε′′, μ′′) represent the storage and dissipation capabilities of electromagnetic energy, respectively. 44,45 Besides, dielectric loss tangent (tan δ ε = ε″/ε′) and magnetic loss tangent (tan δ μ = μ″/μ′) are also widely used to characterize the dielectric and magnetic loss ability. 46 To evaluate the EMW absorption properties of DHBHs, ε′, ε″, μ′, and μ′′ in 12.40−18.00 GHz were measured.…”

Regulated electron migration in sandwich-like m-Ti3C2/Fe3O4 composites derived from electrostatic assembly boosted electromagnetic wave absorption

“…According to previous publications, this is due to the radiation of the internal magnetic eld to the magnetic energy at high frequency. 19,22,[51][52][53] To further reveal the mechanism of magnetic loss, C 0 was calculated using the following equation:…”

Polyimide-based porous carbon and cobalt nanoparticle composites as high-performance electromagnetic wave absorbers

“…As a noble EMW absorber, the HPPPC/CoNi demonstrated a minimum RL value of −65.56 at 2.00 mm and a effective absorption bandwidth of 5.92 GHz at 1.80 mm. 23 Shennan Guo et al prepared iron/cobalt/carbon (Fe/Co/C) nanocomposite fibres (M-CNFs) by using electrospinning and the following heat-treatment method. The sample showed a minimum RL value of −38.1 dB at a matching thickness of 2.5 mm with an effective bandwidth of 4.1 GHz.…”