Permittivity and Electromagnetic Interference Shielding Investigations of Activated Charcoal Loaded Acrylic Coating Compositions

Khan, Sharief ud Din; Arora, Manju; Wahab, M. A.; Saini, Parveen

doi:10.1155/2014/193058

Cited by 30 publications

(16 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Microwave complex dielectric properties of materials are very important for EMI shielding applications. The most suitable materials should exhibit optimal microwave dielectric properties [ 15 ]. As shown in Figure 5 , the dielectric permittivity was between 4 and 7 for neat fibers, which is a typical low value of dielectric permittivity for various polymers, including polyamides [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

“…However, to obtain high electrical or dielectric properties, they need to be added at high concentrations, which causes limitations in their processing by standard industrial techniques and increases the weight of the composite. From the newest solutions, electrically conductive polymers such as polyaniline and 2-D inorganic layered materials, called M-Xenes, have been tested with respect to their EMI shielding ability [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fibers of Thermoplastic Copolyamides with Carbon Nanotubes for Electromagnetic Shielding Applications

et al. 2021

View full text Add to dashboard Cite

Polymer composites containing carbon nanofillers are extensively developed for electromagnetic shielding applications, where lightweight and flexible materials are required. One example of the microwave absorbers can be thermoplastic fibers fabricated from copolyamide hot melt adhesives and 7 wt % of multi-walled carbon nanotubes, as presented in this paper. A broadband dielectric spectroscopy confirmed that the addition of carbon nanotubes significantly increased microwave electrical properties of the thin (diameter about 100 μm) thermoplastic fibers. Moreover, the dielectric properties are improved for the thicker fibers, and they are almost stable at the frequency range 26–40 GHz and not dependent on the temperature. The variances in the dielectric properties of the fibers are associated with the degree of orientation of carbon nanotubes and the presence of bundles, which were examined using a high-resolution scanning microscope. Analyzing the mechanical properties of the nanocomposite fibers, as an effect of the carbon nanotubes addition, an improvement in the stiffness of the fibers was observed, together with a decrease in the fibers’ elongation and tensile strength.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fibers of Thermoplastic Copolyamides with Carbon Nanotubes for Electromagnetic Shielding Applications

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In addition, MWCNT has higher permittivity compare to SWCNT due to the presence of more number of defects. Khan et al reported that both electrical conductivity and permittivity are important factor for the improvement of total shielding effectiveness. On the other hand, It was also reported the small difference in the conductivity caused by the type of CNT .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of hybrid PANI/MWCNT nanocomposites for EMI applications

Kumar

et al. 2017

Polymer Composites

View full text Add to dashboard Cite

The present study reports on a simple and very efficient solution mixing method for the preparation of functionalized multiwalled carbon nanotube/polyaniline nanocomposites (f‐MWCNT/PANI) for electromagnetic interference (EMI) application. The synthesized composites have been characterized by different physiochemical techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), X‐ray diffractometry (XRD), and Fourier transform infrared (FT‐IR) spectroscopy. The electron microscopy analysis of nanocomposites reveals the good dispersion and agglomeration of CNT in PANI matrix at higher concentration. X‐ray study shows the higher crystallinity of PANI with the addition of f‐MWCNT. FTIR spectroscopy has confirmed the interactions of the carbonyl group of f‐MWCNT with the quinoid ring of PANI. The resulting f‐MWCNT/PANI nanocomposites (0 to 21 vol% CNT) shows higher electrical conductivity than that of pure PANI due to the formation of conducting path between CNT and PANI matrix. The increased electrical conductivity of nanocomposites also improved the estimated EMI shielding. The percolation threshold was found to occurs at 0.1 vol% of f‐MWCNT, where the DC electrical conductivity started to increase abruptly. The one‐order increment in electrical conductivity was observed which is 12 times more than that of pure PANI. The DC electrical conductivity of nanocomposite at 3.3 vol% and 13.9 vol% of f‐MWCNT was 1.6 × 10−1 S/cm and 1.8 × 10−1 S/cm, respectively. In addition, the estimated EMI shielding of nanocomposites at 3.3 vol% of f‐MWCNT and beyond it was found to be 12dB. POLYM. COMPOS., 39:3858–3868, 2018. © 2017 Society of Plastics Engineers

show abstract

“…EMI shielding material should be thin, light, flexible, cheep and easy in processing. A wide range of polymer materials satisfy this conditions providing shielding effectiveness due to dielectric loss only 4,5 . However variety of metals is attractive for the same purpose because of high magnetic loss 6,7 .…”

Section: Introductionmentioning

confidence: 99%

Electrodynamic properties of the nanocarbon/polymer composites with aligned by magnetic field secondary non-conductive component

et al. 2015

View full text Add to dashboard Cite

Multiwall carbon nanotubes/epoxy and graphite nanoplatelets/epoxy composite materials (2-5 wt %) as well as the composite materials with barium hexaferrite as secondary filler (27 wt %) were prepared. Alignment of barium hexaferrite nanoparticles was performed by magnetic field action during polymerization process. Morphology, the electrical conductivity and shielding efficiency of the composite materials in the frequency range of 36-55.5 GHz were investigated. Optical and electron microscopy, standard 2-and 4-probe methods of electrical conductivity measurement and network analyzer were used for that purpose. The arguments about secondary filler addition and its alignment on electrodynamic properties of the obtained composite materials are given.

show abstract

Permittivity and Electromagnetic Interference Shielding Investigations of Activated Charcoal Loaded Acrylic Coating Compositions

Cited by 30 publications

References 34 publications

Fibers of Thermoplastic Copolyamides with Carbon Nanotubes for Electromagnetic Shielding Applications

Fibers of Thermoplastic Copolyamides with Carbon Nanotubes for Electromagnetic Shielding Applications

Synthesis and characterization of hybrid PANI/MWCNT nanocomposites for EMI applications

Electrodynamic properties of the nanocarbon/polymer composites with aligned by magnetic field secondary non-conductive component

Contact Info

Product

Resources

About