Electromagnetic shielding performance of carbon foams

Moglie, Franco; Micheli, Davide; Laurenzi, Susanna; Marchetti, M.; Primiani, Valter Mariani

doi:10.1016/j.carbon.2011.12.053

Cited by 263 publications

(117 citation statements)

References 16 publications

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“…These cell parameters determine the specific bulk material properties, the relative density and porosity of the foam. Scanning electron microscopy analysis is required to investigate the morphology of the carbon foam cellular structure [39]. Also the effective conductivity of the foam, and consequently the ACS, depend on this particular internal morphology.…”

Section: Absorbing Cross Section Of Carbon Foamsmentioning

confidence: 99%

Absorbing Cross Section in Reverberation Chamber: Experimental and Numerical Results

Gradoni¹,

Micheli²,

Moglie³

et al. 2012

PIER B

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Abstract-Reverberation chamber (RC) test facility allows to determine the absorbing cross section (ACS) of lossy materials under a random field excitation. Measurements are based on the quality factor variation produced by the sample under test presence with respect to the empty chamber condition. Simulations are based on the representation of the RC electromagnetic field by means of a random plane wave superposition. A finite-difference time-domain code is used to compute the material absorbed power and to recover a numerical ACS. The method sensibility is stressed by application to small size samples. Comparison between numerical and experimental data reveals a satisfactory agreement. Results for different materials are presented in the paper: soft foam absorbers, carbon foam sheets, and carbon/carbon sheets.

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Section: Absorbing Cross Section Of Carbon Foamsmentioning

confidence: 99%

Absorbing Cross Section in Reverberation Chamber: Experimental and Numerical Results

Gradoni¹,

Micheli²,

Moglie³

et al. 2012

PIER B

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“…This suggests that low temperature heat treated foam EM-SE is dominated by absorption. Recently, Moglie et al (2012) studied the EM-SE of CF (GRAFOAM FPA-20 and FRA-10) in the frequency band 1-4 GHz using the nested reverberation chamber method. It is reported that with increasing thickness of CF total SE increases.…”

Section: Introductionmentioning

confidence: 99%

Nickel nanoparticles embedded in carbon foam for improving electromagnetic shielding effectiveness

2014

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To improve electromagnetic shielding effectiveness of light weight carbon foam (CF), magnetic nanoparticles were embedded in it during processing. The CF was developed from the coal tar pitch and mixture of coal tar pitch-Nickel (Ni) nanoparticles by sacrificial template technique and heat treated to up 1,000°C. To ascertain the effect of Ni nanoparticles embedded in CF, it was characterized by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, vector network analyzer and vibration sample magnetometer. It is observed that Ni nanoparticles embedded in the carbon material play an important role for improving the structure and electrical conductivity of CF-Ni by catalytic carbonization. The structural investigation suggests that the Ni nanoparticles embedded in the carbon material in bulk as well on the surface of CF. The CF demonstrates excellent shielding response in the frequency range 8.2-12.4 GHz in which total shielding effectiveness (SE) dominated by absorption losses. The total SE is -25 and -61 dB of CF and CF-Ni, it is governed by absorption losses -48.5 dB in CF-Ni. This increase is due to the increase in dielectric and magnetic losses of ferromagnetic Ni nanoparticles with high surface area. Thus, light weight CF embedded with small amount of magnetic nanoparticles can be useful material for stealth technology.

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“…The individual GCSs have an average diameter about ∼ 1 mm and consist of porous glassy carbon. In terms of pore size their internal structure is in-between that of carbon foams [4][5][6] and aerogels 7 . Glassy carbon is a non-graphitizing, highly disordered, carbon with features that make it definitely different from graphite: it is hard and brittle with a conchoidal fracture, shiny and isotropic, and with a density typically 30% lower than that of graphite.…”

Section: Introductionmentioning

confidence: 99%

Fully carbon metasurface: Absorbing coating in microwaves

Bychanok

Gorokhov

et al. 2017

Journal of Applied Physics

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The microwave-absorbing properties of a heterostructure consisting of an ordered monolayer of porous glassy carbon spheres were experimentally and theoretically investigated in the Ka-band (26-37 GHz) frequency range. The electromagnetic response of such "moth-eye"-like all-carbon metasurface at a normal incidence angle was modelled on the basis of long-wave approximation. Modelling parameters in the Ka-band were used to estimate and predict the absorption properties of monolayers in free space in the range 1-40 GHz. Experimental and theoretical results demonstrate that a metasurface based on porous glassy carbon spheres is an inert, lightweight, compact and perfectly absorbing material for designing new effective microwave absorbers in various practically used frequency ranges.

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Electromagnetic shielding performance of carbon foams

Cited by 263 publications

References 16 publications

Absorbing Cross Section in Reverberation Chamber: Experimental and Numerical Results

Absorbing Cross Section in Reverberation Chamber: Experimental and Numerical Results

Nickel nanoparticles embedded in carbon foam for improving electromagnetic shielding effectiveness

Fully carbon metasurface: Absorbing coating in microwaves

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