Study of reflection process for nickel coated activated carbon fiber felt applied with electromagnetic interference shielding

Amaral, Miguel Angelo do; Marcuzzo, Jossano Saldanha; Pinheiro, Bárbara da Silva; Lopes, Braulio Haruo Kondo; Oliveira, Ana Paula; Matsushima, Jorge Tadao; Baldan, Maurício Ribeiro

doi:10.1016/j.jmrt.2019.07.014

Cited by 29 publications

(7 citation statements)

References 22 publications

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“…The basic condition for reflection shielding is the materials electric conductivity, while materials possessing magnetic or electric dipoles are suitable candidates for absorption shielding. The multiply reflection operates via the internal reflections of electromagnetic radiation waves from various in-homogeneities and phase interfaces within the shield [ 6 , 7 ]. From the practical point of view, the shielding by absorption has become the most demanding, as the electromagnetic radiation waves are efficiently absorbed by the shield and not emitted back to the surrounding.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Interference Shielding and Physical-Mechanical Characteristics of Rubber Composites Filled with Manganese-Zinc Ferrite and Carbon Black

et al. 2021

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In the present work, composite materials were prepared by incorporation of manganese-zinc ferrite, carbon black and combination of ferrite and carbon black into acrylonitrile-butadiene rubber (NBR). For cross-linking of composites, standard sulfur-based curing system was applied. The main goal was to investigate the influence of the fillers on the physical-mechanical properties of composites. Then, the electromagnetic absorption shielding ability was investigated in the frequency range 1 MHz–3 GHz. The results revealed that composites filled with ferrite provide sufficient absorption shielding performance in the tested frequency range. On the other hand, ferrite behaves as an inactive filler and deteriorates the physical-mechanical characteristics of composites. Carbon black reinforces the rubber matrix and contributes to the improvement of physical-mechanical properties. However, composites filled with carbon black are not able to absorb electromagnetic radiation in the given frequency range. Finally, the combination of carbon black and ferrite resulted in the modification of both physical-mechanical characteristics and absorption shielding ability of hybrid composites.

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Section: Introductionmentioning

confidence: 99%

Electromagnetic Interference Shielding and Physical-Mechanical Characteristics of Rubber Composites Filled with Manganese-Zinc Ferrite and Carbon Black

et al. 2021

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“…The coating of metallic nickel on the activated carbon fiber felt (ACFF) via the electrodeposition method and investigation of EMI SE of the prepared materials in the X-band frequency was the main goal of the work. 12 Ni coating on ACFF lowered the absorbed process, and the main mechanism of EMI shielding was based on reflection (almost 94% at around 8 GHz). ACFF in the felt form contributed to the decrease of the EM wave transmission, while the nickel-coated film contributed to the increase of the EM wave reflection.…”

Section: Materials Used For Emi Shieldingmentioning

confidence: 99%

Progress in polymers and polymer composites used as efficient materials for EMI shielding

et al. 2021

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“…By doping with high-band-gap materials, the optical absorption is enhanced in the visible regions . Activated carbon (AC) increases the band gaps of CuO and Fe 3 O 4 for absorbing EM wave interference. ,, AC is used to tune the structural, magnetic, and optical properties of the semiconductor by doping it with various materials ,,, depending on the application. ,− In our previous study, we successfully used Co/Fe 2 O 3 –AC for EM absorbers, but the physical phenomena between Fe 2 O 3 and AC are still not fully understood. Several questions exist regarding the relations between the optical, magnetic, electronic, and structural properties that support the applications of multifunctional materials.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Visible-Light Absorption of Fe₂O₃ Covered by Activated Carbon for Multifunctional Purposes: Tuning the Structural, Electronic, Optical, and Magnetic Properties

et al. 2021

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Visible-light absorption is a critical factor for photocatalyst activity and absorption of electromagnetic (EM) interference application. The band gap of Fe 2 O 3 is 2 eV, which can be increased by doping with a high-band-gap material such as carbon from activated carbon (AC) with a band gap of 4.5 eV for increased visible-light absorption. The porosity decreases from 88 to 81.6%, and the band gap increases from 2.14 to 2.64 eV by increasing the AC from 10 to 25%, respectively. The photocatalytic activity takes 120 min to produce a harmless product for 10− 20% AC, but 25% AC shows 89.5% degradation in only 90 min and the potential to attenuate the EM wave up to 99% due to the RL being below −20 dB. The secondand third-cycle degradation achieved by the composite Fe 2 O 3 −AC having 25% AC is 88.2 and 86.5% in 90 min, respectively. The pore of the surface state of AC contains a trapped charge, and interaction occurs between the charge (electron/hole) and O 2 or H 2 O to produce OH and superoxide (O 2 − ) radicals. These radicals move inside the molecule of the pollutant (methylene blue (MB)) to break up the bond, with the final products being H 2 O and CO 2 . The X-ray photoelectron (XPS) spectra show that oxygen plays a key role in the interatomic bonding with Fe, C, and MB atoms. The best absorption of EM interference is −21.43 dB, with degradation reaching 89.51% in only 90 min for 25% AC due to its higher band gap and anisotropy constant. Fe 2 O 3 −carbon is a multifunctional material for the green environment because of its electromagnetic interference absorption and photodegradation of wastewater.

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Study of reflection process for nickel coated activated carbon fiber felt applied with electromagnetic interference shielding

Cited by 29 publications

References 22 publications

Electromagnetic Interference Shielding and Physical-Mechanical Characteristics of Rubber Composites Filled with Manganese-Zinc Ferrite and Carbon Black

Electromagnetic Interference Shielding and Physical-Mechanical Characteristics of Rubber Composites Filled with Manganese-Zinc Ferrite and Carbon Black

Progress in polymers and polymer composites used as efficient materials for EMI shielding

Enhanced Visible-Light Absorption of Fe₂O₃ Covered by Activated Carbon for Multifunctional Purposes: Tuning the Structural, Electronic, Optical, and Magnetic Properties

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Study of reflection process for nickel coated activated carbon fiber felt applied with electromagnetic interference shielding

Cited by 29 publications

References 22 publications

Electromagnetic Interference Shielding and Physical-Mechanical Characteristics of Rubber Composites Filled with Manganese-Zinc Ferrite and Carbon Black

Electromagnetic Interference Shielding and Physical-Mechanical Characteristics of Rubber Composites Filled with Manganese-Zinc Ferrite and Carbon Black

Progress in polymers and polymer composites used as efficient materials for EMI shielding

Enhanced Visible-Light Absorption of Fe2O3 Covered by Activated Carbon for Multifunctional Purposes: Tuning the Structural, Electronic, Optical, and Magnetic Properties

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Enhanced Visible-Light Absorption of Fe₂O₃ Covered by Activated Carbon for Multifunctional Purposes: Tuning the Structural, Electronic, Optical, and Magnetic Properties