scholarly journals Electromagnetic Interference Shielding Efficiency in the Range 8.2-12.4 GHz of Polymer Composites with Dispersed Carbon Nanoparticles

2011 ◽  
Vol 14 (1) ◽  
pp. 55 ◽  
Author(s):  
Anna V. Gubarevich ◽  
Kazuki Komoriya ◽  
Osamu Odawara
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Black ◽  
Polymer Composites ◽  
Electromagnetic Interference ◽  
Carbon Nanoparticles ◽  
Hot Press ◽  
Frequency Range ◽  
Electromagnetic Interference Shielding ◽  
X Band ◽  
Graphite Nanoparticles

In the present work, electromagnetic interference shielding properties of polymer composites with dispersed cup-stacked carbon nanotubes, graphite nanoparticles and carbon black were investigated. The polymer composites with carbon nanoparticles content from 1 to 5 w% were successfully prepared by the coagulation method, and composite sheets with thickness from 0.25 to 0.77 mm were formed by the hot press technique. The electromagnetic interference shielding efficiency measured in the frequency range of 8.2~12.4 GHz (X-band) of cup-stacked carbon nanotubes/polymer composite was considerably higher than that of carbon black and graphite nanoparticles polymer composites at the same contents of carbon nanoparticles, and contribution of absorption to the shielding efficiency was found to be higher than that of reflection.

scholarly journals Graphene Infused Ecological Polymer Composites for Electromagnetic Interference Shielding and Heat Management Applications

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2856
Author(s):  
Klaudia Zeranska-Chudek ◽  
Anna Wróblewska ◽  
Sebastian Kowalczyk ◽  
Andrzej Plichta ◽  
Mariusz Zdrojek
Keyword(s):  
Polymer Composites ◽  
Electromagnetic Interference ◽  
Microwave Range ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Heat Management ◽  
Thick Sample ◽  
Graphene Nanoplatelet ◽  
Dual Functional ◽  
X Band

In the age of mobile electronics and increased aerospace interest, multifunctional materials such as the polymer composites reported here are interesting alternatives to conventional materials, offering reduced cost and size of an electrical device packaging. We report a detailed study of an ecological and dual-functional polymer composite for electromagnetic interference (EMI) shielding and heat management applications. We studied a series of polylactic acid/graphene nanoplatelet composites with six graphene nanoplatelet loadings, up to 15 wt%, and three different flake lateral sizes (0.2, 5 and 25 μm). The multifunctionality of the composites is realized via high EMI shielding efficiency exceeding 40 dB per 1 mm thick sample and thermal conductivity of 1.72 W/mK at 15 wt% nanofiller loading. The EMI shielding efficiency measurements were conducted in the microwave range between 0.2 to 12 GHz, consisting of the highly relevant X-band (8–12 GHz). Additionally, we investigate the influence of the nanofiller lateral size on the studied physical properties to optimize the studied functionalities per given nanofiller loading.

EMI Shielding Effectiveness of CNTs Composites

2013 ◽  
Vol 331 ◽  
pp. 439-442 ◽  
Author(s):  
Ping Li ◽  
Aik Seng Low ◽  
Yue Yan Shan ◽  
Guat Choon Ong ◽  
Xi Jiang Yin
Keyword(s):  
Carbon Nanotubes ◽  
Electromagnetic Interference ◽  
Conductive Network ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Frequency Range ◽  
Electromagnetic Interference Shielding ◽  
Emi Shielding Effectiveness ◽  
Electromagnetic Interference Shielding Effectiveness ◽  
5 Ghz

A carbon nanotubes (CNTs) composite and its electromagnetic interference shielding effectiveness (SE) were investigated. Its absorptance, reflectance and shielding effectiveness (SE) were analysed. The CNTs composite has a shielding effectiveness (SE) of more than 25 dB (>99.68%) in frequency range from 30 MHz to 5 GHz. The testing results also demonstrate that the shielding mechanism of the CNTs composite is mainly EMI absorption of electromagnitic radiation. The high SE of the CNTs composite in the study is attributed to a high aspect ratio (>3000) and good conductive network of CNTs within the composite.

Contemporary applications of carbon black-filled polymer composites: An overview of essential aspects

2017 ◽  
Vol 34 (3) ◽  
pp. 256-299 ◽  
Author(s):  
Ayesha Kausar
Keyword(s):  
Carbon Black ◽  
Polymer Composites ◽  
Electromagnetic Interference ◽  
Dye Sensitized Solar Cells ◽  
Particle Dispersion ◽  
Interfacial Interaction ◽  
Processing Conditions ◽  
Electromagnetic Interference Shielding ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

This article appraises the contemporary reinforcement of carbon black in different polymer matrices. Essential features of polymer/carbon black composites are influenced by particle size, surface area, and surface chemistry of filler. Special emphasis is placed on recent research trends attained using polymer/carbon black composites. These materials have potential in fuel cells, sensors, detectors, supercapacitors, electromagnetic interference shielding, shape memory, dye-sensitized solar cells, and coatings. Various aspects, such as interfacial interaction, processing conditions, particle dispersion, and other physical properties, are highlighted for further exploration to discover hidden possibilities for these indispensable polymer composites.

scholarly journals Nanostructured La0.7Sr0.3MnO3 compounds for effective electromagnetic interference shielding in the X-band frequency range

2015 ◽  
Vol 3 (4) ◽  
pp. 820-827 ◽  
Author(s):  
Hilal Ahmad Reshi ◽  
Avanish P. Singh ◽  
Shreeja Pillai ◽  
Rama Shankar Yadav ◽  
S. K. Dhawan ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Frequency Range ◽  
Electromagnetic Interference Shielding ◽  
Band Frequency ◽  
Emi Shielding Effectiveness ◽  
X Band

EMI shielding effectiveness values of up to 19 dB are observed in LSMO nanomaterials.

Electromagnetic interference shielding performance of lightweight NiFe2O4/rGO nanocomposite in X- band frequency range

2020 ◽  
Vol 46 (10) ◽  
pp. 15473-15481 ◽  
Author(s):  
Ajit Kumar ◽  
Ashwani K. Singh ◽  
Monika Tomar ◽  
Vinay Gupta ◽  
P. Kumar ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Frequency Range ◽  
Electromagnetic Interference Shielding ◽  
Band Frequency ◽  
X Band

scholarly journals Polyethylene Composites with Segregated Carbon Nanotubes Network: Low Frequency Plasmons and High Electromagnetic Interference Shielding Efficiency

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1118 ◽  
Author(s):  
Ludmila Vovchenko ◽  
Ludmila Matzui ◽  
Viktor Oliynyk ◽  
Yurii Milovanov ◽  
Yevgen Mamunya ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electromagnetic Interference ◽  
Complex Impedance ◽  
Low Frequency ◽  
Negative Permittivity ◽  
Network Interface ◽  
60 Ghz ◽  
Frequency Range ◽  
Electromagnetic Interference Shielding ◽  
Thick Sample

Polyethylene (PE) based composites with segregated carbon nanotubes (CNTs) network was successfully prepared by hot compressing of a mechanical mixture of PE and CNT powders. Through comparison with a composite comprising randomly distributed carbon nanotubes of the same concentration, we prove that namely the segregated CNT network is responsible for the excellent electrical properties, i.e., 10−1 S/m at 0.5–1% and 10 S/m at 6–12% of CNT. The investigation of the complex impedance in the frequency range 1 kHz–2 MHz shows that the sign of real part of the dielectric permittivity ε r ′ changes from positive to negative in electrically percolated composites indicating metal-like behavior of CNT segregated network. The obtained negative permittivity and AC conductivity behavior versus frequency for high CNT content (3–12%) are described by the Drude model. At the same time, in contrast to reflective metals, high electromagnetic shielding efficiency of fabricated PE composites in the frequency range 40–60 GHz, i.e., close to 100% at 1 mm thick sample, was due to absorption coursed by multiple reflection on every PE-CNT segregated network interface followed by electromagnetic radiation absorbed in each isolated PE granule surrounded by conductive CNT shells.

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