scholarly journals Effect of the Characteristics of Solvent on the Shielding Effectiveness in Electromagnetic Shielding Material

2016 ◽  
Author(s):  
Qian Wei ◽  
Guohui Zhu
Keyword(s):  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Shielding Material

The investigation of the electromagnetic shielding effectiveness of multi-layered nanocomposite materials from reduced graphene oxide-doped P(AN-VAc) nanofiber mats/PP spunbond

2018 ◽  
Vol 53 (11) ◽  
pp. 1541-1553
Author(s):  
İsmail Tiyek ◽  
Mustafa Yazıcı ◽  
Mehmet Hakkı Alma ◽  
Şükrü Karataş
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Surface Samples ◽  
Reduced Graphene ◽  
Nanofiber Mats ◽  
Electromagnetic Shielding Effectiveness ◽  
Poly Acrylonitrile ◽  
Shielding Material

In this study, the production of an electromagnetic shielding material by doping reduced graphene oxide was aimed. Graphene oxide was produced from graphite through modified Hummer's method, and reduced graphene oxide was obtained by reducing graphene oxide. The reduced graphene oxide- doped poly(acrylonitrile-co-vinyl acetate) nanofiber mats were spun on the Polypropylene spunbond fabrics by a multi-needle electrospinning device at different lap numbers. Multi-layered surface samples of spunbond/nanofiber mats were obtained via calendaring process after overlapping in different layer numbers. The electromagnetic shielding effectiveness (EMSE) of these samples was measured in the range of 0.03–1.5 GHz according to ASTM D4935 standard. The effects of the numbers of laps and layers on the electromagnetic shielding effectiveness of the mats were also investigated. It was found that electromagnetic shielding effectiveness is greatly affected by changing the numbers of laps and layers. Consequently, the highest electromagnetic shielding effectiveness value of 35.49 dB was obtained from the sample containing two layers of nanofiber mats, each of which consisted 50 laps of nanofibers.

Study on Lightweight Composited Electromagnetic Shielding Materials of Flakeboard with Electroless Copper

2009 ◽  
Vol 79-82 ◽  
pp. 827-830 ◽  
Author(s):  
Jin Tian Huang ◽  
Jiang Zhu ◽  
Jin Jia
Keyword(s):  
Electromagnetic Shielding ◽  
Potassium Ferrocyanide ◽  
Copper Plating ◽  
Shielding Effectiveness ◽  
Hot Press ◽  
Electroless Copper Plating ◽  
Electroless Copper ◽  
Main Components ◽  
Electromagnetic Shielding Effectiveness ◽  
Shielding Material

In order to obtain the electromagnetic shielding material, the lightweight flakes of poplar are selected to be the substrate. After the electroless copper plating, the flakes turn to electric cell which is made by hot-press with bicomponent epoxy, and it turn to electromagnetic shielding materials. In this paper, the electromagnetic shielding effectiveness of electromagnetic shielding materials is investigated. The results indicates that the reasonable ratio of main components of the electroless copper plating is: copper sulfate 80g/L, reducing agent 90 g/L, K-Na tartrate (TART) 65 g/L, EDTA•2Na100 g/L, α, α'-dipyridyl 10mg/L, potassium ferrocyanide 50 mg/L. In the testing of Hertzian waves between 9 kHz～1.5GHz, the average effectiveness of electromagnetic shielding is 60.4dB.

scholarly journals Process and Structure of Electromagnetic Shielding Plywood Composite Laminated with Carbon Fiber Paper

2014 ◽  
Vol 8 (1) ◽  
pp. 99-107 ◽  
Author(s):  
Quanping Yuan ◽  
Keyang Lu ◽  
Feng Fu
Keyword(s):  
Carbon Fiber ◽  
Three Dimensional ◽  
Single Layer ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Hot Press ◽  
Wood Veneer ◽  
Carbon Fiber Paper ◽  
Shielding Material ◽  
Better Than

Carbon fiber paper (CFP), a type of flexible planer electromagnetic shielding material with thin thickness, low density, and good adhesion property and permeability, was laminated with wood veneer to produce a plywood composite with good shielding effectiveness (SE). It was found that a hot-press pressure of 1.2 MPa and a double-sized adhesive concentration of 380 g/m2 were most appropriate for the production of CFP plywood composites. SE of plywood composite laminated with single layer CFP was better than that before hot pressed, which result from the formation of three-dimensional and smaller conductive carbon fiber circuitries. The space between two-layer CFPs and the thickness of the surface-layer veneer had significant influence on SE. The SE of the composites laminated with two-layer CFPs was significantly higher than those with one-layer CFPs. The SE in the frequency range of 30 MHz to 1 GHz reached above 30 dB depending on the space between two-layer CFPs and the thickness of the surface veneer, which was sufficient SE for commercialization and the use of plywood composites.

Preparation and Kinetics of Wood-Based Ni-P Coating Electromagnetic Shielding Material by Ytterbium-Improved Electroless Plating

2011 ◽  
Vol 199-200 ◽  
pp. 404-408
Author(s):  
Bo Quan Jiang ◽  
Yu De Liu ◽  
Jiang Nan Zeng ◽  
Wen Long Zhang
Keyword(s):  
Kinetic Model ◽  
Deposition Rate ◽  
Electroless Plating ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Plating Bath ◽  
Operation Conditions ◽  
Electromagnetic Shielding Effectiveness ◽  
Kinetics Of ◽  
Shielding Material

A wood-based Ni-P coating electromagnetic shielding material was prepared in an ytterbium oxide-added electroless plating bath. The kinetic model was established and confirmed to be in accord with the experiment and can be used to predict the deposition rate within a certain range. The experimental results showed that the Ni-P coating prepared with the addition of Yb2O3 were smoother, denser and brighter than that prepared without addition of Yb2O3. The deposition rate and electromagnetic shielding effectiveness of the former were 2.662mol×10-4/(cm2h) and 56.48 dB which is about 13% and 9% higher than those of the latter under the same bath compositions and operation conditions.

Realization of electromagnetic shielding performance for polyimide-matrix composite by self-metallization

2021 ◽  
pp. 002199832110316
Author(s):  
Jiayang Zhang ◽  
Hongjiang Ni ◽  
Ming Gong ◽  
Jun Li ◽  
Daijun Zhang ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Matrix Composite ◽  
Electromagnetic Interference ◽  
Interfacial Strength ◽  
Amic Acid ◽  
Thermal Reduction ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Heat Condition ◽  
Electromagnetic Interference Shielding Effectiveness

Electromagnetic shielding performance has been achieved for a polyimide (PI)-matrix composite by the strategy of self-metallization of its thermosetting PI matrix. Self-metallization of the thermosetting PI was realized by silver ion/poly(amic acid) (PAA) precursor ion exchange and thermal reduction. The factors influencing the self-metallization were investigated. The electrical conductivity and integrity for the surface of the PI were achieved by optimization of ion exchange/thermal reduction parameters. The fabricated PI-matrix composite exhibits a maximum electromagnetic interference shielding effectiveness value of 81 dB. Importantly, the electromagnetic shielding performance can be maintained even after heat condition of 300°C. Meanwhile, the surface-metallized PI composite exhibits mechanical property equivalent to the pristine composite, and an Ag/matrix interfacial strength higher than 19.6 MPa. Besides, self-metallization mechanism of the thermosetting PI was investigated.

Analyses on the Manufacture and Physical Properties of Electromagnetic Shielding/ Far Infrared Ray Nonwoven

2010 ◽  
Vol 97-101 ◽  
pp. 1790-1793
Author(s):  
Jia Horng Lin ◽  
Yu Tien Huang ◽  
Chin Mei Lin ◽  
Yi Chang Yang ◽  
Chien Teng Hsieh ◽  
...  
Keyword(s):  
Physical Properties ◽  
Far Infrared ◽  
Electromagnetic Shielding ◽  
Breaking Force ◽  
Shielding Effectiveness ◽  
Machine Direction ◽  
Tear Strength ◽  
Burst Strength ◽  
Far Infrared Ray ◽  
Electromagnetic Shielding Effectiveness

According to the results, when low melting polyester fiber increased to be 20%, the electromagnetic shielding/ far infrared ray nonwoven obtained the optimum burst strength, maximum breaking force and maximum tear strength, and they were as follows: burst strength was 4.2 kgf/cm2; maximum breaking force was 153.59 N in the cross machine direction and 70.80 N in the machine direction; maximum tear strength was 215.77 N in cross machine direction and 117.07 N in machine direction; and optimum electromagnetic shielding effectiveness (EMSE) was 45 dB.

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