Gotowe bibliografie tematyczne / EMI shielding behavior

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Gotowa bibliografia na temat „EMI shielding behavior”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "EMI shielding behavior"

Yim, Yoon-Ji, Jae Jun Lee, Alexandre Tugirumubano, Sun Ho Go, Hong Gun Kim, and Lee Ku Kwac. "Electromagnetic Interference Shielding Behavior of Magnetic Carbon Fibers Prepared by Electroless FeCoNi-Plating." Materials 14, no. 14 (2021): 3774. http://dx.doi.org/10.3390/ma14143774.

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In this study, soft magnetic metal was coated on carbon fibers (CFs) using an electroless FeCoNi-plating method to enhance the electromagnetic interference (EMI) shielding properties of CFs. Scanning electron microscopy, X-ray diffraction, and a vibrating sample magnetometer were employed to determine the morphologies, structural properties, and magnetic properties of the FeCoNi-CFs, respectively. The EMI shielding behavior of the FeCoNi-CFs was investigated in the frequency range of 300 kHz to 3 GHz through vector network analysis. The EMI shielding properties of the FeCoNi-CFs were significantly enhanced compared with those of the as-received CFs. The highest EMI shielding effectiveness of the 60-FeCoNi-CFs was approximately 69.4 dB at 1.5 GHz. The saturation magnetization and coercivity of the 60-FeCoNi-CFs were approximately 103.2 emu/g and 46.3 Oe, respectively. This indicates that the presence of FeCoNi layers on CFs can lead to good EMI shielding due to the EMI adsorption behavior of the magnetic metal layers.

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Xia, Xiaodong, and George J. Weng. "Dual percolations of electrical conductivity and electromagnetic interference shielding in progressively agglomerated CNT/polymer nanocomposites." Mathematics and Mechanics of Solids 26, no. 8 (2021): 1120–37. http://dx.doi.org/10.1177/10812865211021460.

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Recent experiments have revealed two distinct percolation phenomena in carbon nanotube (CNT)/polymer nanocomposites: one is associated with the electrical conductivity and the other is with the electromagnetic interference (EMI) shielding. At present, however, no theories seem to exist that can simultaneously predict their percolation thresholds and the associated conductivity and EMI curves. In this work, we present an effective-medium theory with electrical and magnetic interface effects to calculate the overall conductivity of a generally agglomerated nanocomposite and invoke a solution to Maxwell’s equations to calculate the EMI shielding effectiveness. In this process, two complex quantities, the complex electrical conductivity and complex magnetic permeability, are adopted as the homogenization parameters, and a two-scale model with CNT-rich and CNT-poor regions is utilized to depict the progressive formation of CNT agglomeration. We demonstrated that there is indeed a clear existence of two separate percolative behaviors and showed that, consistent with the experimental data of poly-L-lactic acid (PLLA)/multi-walled carbon nanotube (MWCNT) nanocomposites, the electrical percolation threshold is lower than the EMI shielding percolation threshold. The predicted conductivity and EMI shielding curves are also in close agreement with experimental data. We further disclosed that the percolative behavior of EMI shielding in the overall CNT/polymer nanocomposite can be illustrated by the establishment of connective filler networks in the CNT-poor region. It is believed that the present research can provide directions for the design of CNT/polymer nanocomposites in the EMI shielding components.

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Saboor, Khalid, Jan, et al. "PS/PANI/MoS2 Hybrid Polymer Composites with High Dielectric Behavior and Electrical Conductivity for EMI Shielding Effectiveness." Materials 12, no. 17 (2019): 2690. http://dx.doi.org/10.3390/ma12172690.

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Liquid exfoliated molybdenum disulfide (MoS2) nanosheets and polyaniline (PANI) nanoparticles are dispersed in polystyrene (PS) matrix to fabricate hybrid polymer composites with high dielectric and electromagnetic interference (EMI) shielding behavior. A phase-separated morphology is formed when PANI and MoS2 are incorporated into polystyrene (PS) matrix. An increasing concentration of MoS2 nanoparticles inside PS/PANI (5 wt %) polymer blend forms an interconnected network, resulting in high electrical conductivity and dielectric behavior, making them a suitable candidate for EMI shielding application. An increment in dielectric constant and loss, up to four and five orders of magnitude, respectively, is recorded at a maximum concentration of 1 wt % of MoS2 in PS/PANI-5 polymer blend at 100 Hz. The enhanced dielectric characteristics for PS/PANI/MoS2 composites are then theoretically evaluated for the estimation of EMI shielding effectiveness in the frequency range of 100 Hz to 5 MHz. The maximum dielectric constant and loss achieved for PS/PANI-5 wt %/MoS2-1 wt % are responsible for estimated shielding effectiveness of around 92 dB at 100 Hz. The increase in dielectric behavior and shielding effectiveness is probably due to the increased number of charged dipoles accumulated at the insulator–conductor interface.

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Reshi, Hilal Ahmad, Shreeja Pillai, Avanish Pratap Singh, S. K. Dhawan, and Vilas Shelke. "Enhanced electromagnetic interference (EMI) shielding in BiFeO₃–graphene oxide nanocomposites over X-band frequency region." Journal of Applied Physics 131, no. 17 (2022): 174101. http://dx.doi.org/10.1063/5.0086882.

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BiFeO3–graphene oxide (BFO–GO) nanocomposites were synthesized through ultra-sonication under mild heating, and their electromagnetic interference (EMI) shielding performance was investigated. The nanocomposites preserve the crystalline phase with R3c symmetry as analyzed by Rietveld refinement of x-ray diffraction data. The Raman spectroscopy and x-ray photoelectron spectroscopy studies confirm the formation of structured GO in nanocomposites samples. Magnetic hysteresis curves indicate unsaturated magnetic behavior. The interfacial polarization is dominating in BFO–GO composites as estimated from frequency dependent complex parameters determined in line with the Nicolson–Ross–Weir algorithm. The BFO–GO nanocomposites showed EMI shielding effectiveness of 18 dB (93% attenuation) over the measured frequency range. The oxide composite is a suitable EMI shielding material for techno-commercial applications.

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Chang, Ming Kuen, Hsin Hong Hsieh, and Siou Jyuan Li. "A Study of Thermal Stability and Electromaganetic Shielding Behavior of Polyaniline-P-Toluene Sulfonic Acid/Montmorillonite Nanocomposites." Applied Mechanics and Materials 52-54 (March 2011): 180–85. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.180.

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Intrinsically conductive polymer-Polyaniline had high conductivity and many other properties, such as environmental stability and rather simple synthesis. In addition, doping with organic acids could enhance its processing, so it had wide range of applications, such as solar cells, antistatic and electromagnetic interference shielding. In this study, the organic amine 1-Dodecylamine (DOA) modification of sodium montmorillonite (NA+-MMT), and conducting polymer / layered silicate salt nanocomposites (PANI-PTSA/DOA-MMT) had been prepared by doping aniline with organic acid (PTSA), then added organic clay. The thermal, electrical properties and EMI effects of nanocomposites had discussed by XRD, TEM, EMI, TGA analysis, conduction measure and EMI tested. The results indicated the organo-clay interlayer distance expanded from 1.29 to 1.8 nm, and DOA-MMT dispersed in the material, that formed an exfoliated nanocomposite. The thermal stability of nanocomposites depended on content of DOA-MMT, material had the better thermal stability when DOA-MMT load was 5 wt. %. The nanocomposites had the best conductivity when DOA-MMT load was 1 wt. % as well as the electromagnetic shielding effectiveness was increase with increase in conductivity. In addition, the electromagnetic shielding of nanocomposites also depended on thickness and frequency of electromagnetic wave, the electromagnetic shielding was increased with increase in thickness and frequency.

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Zhao, Hui Hui, Ke Ju Ji, Ting Ting Liu, Yin Song Xu, and Zhen Dong Dai. "Electrophoretic Deposition of Foam Ni/CNT Composites and their Electromagnetic Interference Shielding Performance." Applied Mechanics and Materials 461 (November 2013): 436–44. http://dx.doi.org/10.4028/www.scientific.net/amm.461.436.

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Abstract. One of the most effective means to treat electromagnetic pollution is to develop electromagnetic interference shielding materials. Such as Foam nickel, a new lightweight porous material with large surface area, good conductivity and permeability, has drawn much expectation by virtue of its excellent electromagnetic interference shielding(EMI) performance. Recently, with the development of nanometer materials, Tremendous researches also showed that it is an efficient way to combine Foam Ni with nanometer materials for enhanced EMI performance. Herein, in this work, porous nickl/carbon nanotubes(CNT) composites were successfully prepared by a facile electrophoretic deposition method. scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and EMI tests were adopted to carefully characterize its morphology, compositions and EMI performance, respectively. The results indicated that CNT were homogeneously and tightly deposited on the surface of foam Ni by electric field force during the electrophoresis process. With the addition of CNT, the shielding behavior of the 90 PPI and 1.5 mm thick composite could be as high as 31dB in average, which is 14 dB increased compared with the pure foam Ni under same conditions around 8~12GHz frequencies. The synergistic effects of both foam Ni and CNT resulted in superior EMI performance and broad application prospects.

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Ursache, Ştefan, Romeo Cristian Ciobanu, Vlad Scarlatache, and Andrei Niagu. "Dielectric and Electromagnetic Behavior of Conductive Nanocomposites Polymers: PP/MWCNT Investigations for EMI Applications." Advanced Engineering Forum 8-9 (June 2013): 353–60. http://dx.doi.org/10.4028/www.scientific.net/aef.8-9.353.

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The paper highlights the most important dielectric features for some nanocomposites polymer matrix based on polypropylene (PP) with insertion of carbon nanotubes multi-walled (MWCNTs). The dielectric characteristics analyzed are the real permittivity and dielectric losses of the sample based on PP with 5% insertion of MWCNTs. The measurements are made in a range of frequency between 1 MHz to 3 GHz. The composite form was also analyzed through computer modeling and simulation and electromagnetic properties for EMC shielding applications are also considered. PP/MWCNTs composite with shielding effectiveness of 15-20 dB was investigated through modeling and simulation at about 5% MWCNTs filling. Shielding mechanism was estimated by calculating the total shielding effectiveness (SE) into absorption and reflection loss. PP/MWCNTs composite indicates a shielding mostly by absorption mechanism; therefore it also can be used in other microwave applications or like a radar absorbing material. The effect of MWCNTs affects the electrical conductivity of the nanocomposite. The proposed material shows some interesting electromagnetic compatibility (EMC) properties and promises better performance using different amounts of MWCNTs.

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Çat, Yunus, Veysel Baran, and Süleyman Özçelik. "EMI Shielding Effectiveness and Heater Behavior for Ge IR Windows." physica status solidi (a) 216, no. 14 (2019): 1900005. http://dx.doi.org/10.1002/pssa.201900005.

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Zhang, Yang Fei, Yang Luo, Shu Lin Bai, Man Li, and Zhi Yong Jia. "Shielding Effectiveness of CNTs/SSFs/PA6 Conductive Composites." Materials Science Forum 706-709 (January 2012): 1873–78. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.1873.

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A series of carbon nanotube (CNTs) and stainless steel fiber (SSFs) filled nylon 6 (PA6) conductive composites were synthesized for electromagnetic interference (EMI) shielding applications. The materials were prepared by the melt blending method with CNTs weight fraction of 1 and 3 wt% and SSFs of 2, 4, 6, 8, 10, and 12 wt%. The shielding effectiveness, electrical resistance and crystallization behaviors were measured. The results indicate that the shielding effectiveness and electrical properties can be improved by increasing either SSFs or CNTs contents. Higher content of CNTs can bring forward the percolation threshold and enhance the shielding effectiveness to 51.8 dB. Due to the nanoconfinement/multiple nucleation effects, PA6 crystallization behavior is influenced by adding the CNTs and SSFs.

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Madinehei, Milad, Scheyla Kuester, Tatiana Kaydanova, Nima Moghimian, and Éric David. "Influence of Graphene Nanoplatelet Lateral Size on the Electrical Conductivity and Electromagnetic Interference Shielding Performance of Polyester Nanocomposites." Polymers 13, no. 15 (2021): 2567. http://dx.doi.org/10.3390/polym13152567.

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Polyester nanocomposites reinforced with graphene nanoplatelets (GnPs) with two different lateral sizes are prepared by high shear mixing, followed by compression molding. The effects of the size and concentration of GnP, as well as of the processing method, on the electrical conductivity and electromagnetic interference (EMI) shielding behavior of these nanocomposites are experimentally investigated. The in-plane electrical conductivity of the nanocomposites with larger-size GnPs is approximately one order of magnitude higher than the cross-plane volume conductivity. According to the SEM images, the compression-induced alignments of GnPs is found to be responsible for this anisotropic behavior. The orientation of the small size GnPs in the composite is not influenced by the compression process as strongly, and consequently, the electrical conductivity of these nanocomposites exhibits only a slight anisotropy. The maximum EMI shielding effectiveness (SE) of 27 dB (reduction of 99.8% of the incident radiation) is achieved at 25 wt.% of the smaller-size GnP loading. Experimental results show that the EMI shielding mechanism of these composites has a strong dependency on the lateral dimension of GnPs. The non-aligned smaller-size GnPs are leveraged to obtain a relatively high absorption coefficient (≈40%). This absorption coefficient is superior to the existing single-filler bulk polymer composite with a similar thickness.

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