The calculation of surface resistivity and measurement of shielding effectiveness for the planar electromagnetic shielding material

2014 ◽  
Author(s):  
Cai Qing
Keyword(s):  
Electromagnetic Shielding ◽  
Surface Resistivity ◽  
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.

Electrical properties and electromagnetic shielding effectiveness of polyester yarns with polypyrrole deposition

2012 ◽  
Vol 82 (20) ◽  
pp. 2137-2148 ◽  
Author(s):  
Z Yildiz ◽  
I Usta ◽  
A Gungor
Keyword(s):  
Vapour Phase ◽  
Electromagnetic Shielding ◽  
Surface Resistivity ◽  
Morphological Properties ◽  
Polymerization Process ◽  
Shielding Effectiveness ◽  
Initiator Concentration ◽  
Electrical Resistivities ◽  
Yarn Structure ◽  
Electromagnetic Shielding Effectiveness

Polypyrrole was deposited on polyester yarns by vapour phase polymerization technique. Ferric chloride was used as an initiator. In order to determine the effect of the initiator concentration on polymerization process, four different initiator concentrations (0.2, 0.4, 0.6 and 0.8 mol/l) were used. The effect of the initiator in terms of tensile properties, electrical resistivities and morphological properties of the yarns was investigated. The polypyrrole deposited polyester yarns were then weaved in a handloom to form fabric for the investigation of surface resistivity and electromagnetic shielding effectiveness. Scanning electron microscopy, energy dispersive spectroscopy and Fourier transform infrared analyses illustrated that polypyrrole has penetrated into the yarn structure and the highest polypyrrole deposition was obtained at the initiator concentration of 0.6 mol/l. Also, the highest electromagnetic shielding effectiveness value and the lowest surface resistivity were obtained at this concentration.

Multi-Functional Metallic/FIR-PET Wrapped Yarn and Woven Fabric: Electromagnetic Shielding Effectiveness, Mechanical and Electrical Properties

2015 ◽  
Vol 749 ◽  
pp. 265-269 ◽  
Author(s):  
Jia Horng Lin ◽  
Ting An Lin ◽  
Chien Teng Hsieh ◽  
Jan Yi Lin ◽  
Ching Wen Lou
Keyword(s):  
Electrical Resistance ◽  
Copper Wire ◽  
Far Infrared ◽  
Woven Fabrics ◽  
Electromagnetic Shielding ◽  
Surface Resistivity ◽  
Woven Fabric ◽  
Shielding Effectiveness ◽  
Best Value ◽  
Electromagnetic Shielding Effectiveness

This study uses 0.08mm copper wire and nickel-coated copper wire as the core and 75 D far infrared filament as the wrapped material to manufacture Cu/FIR-PET wrapped yarn, Ni-Cu/FIR-PET wrapped yarn and Ni-Cu/Cu/FIR-PET wrapped yarn. The three optimum metallic/FIR-PET wrapped yarns are then weaving into Cu/FIR-PET woven fabrics, Ni-Cu/FIR-PET woven fabrics and Ni-Cu/Cu/FIR-PET woven fabrics. Tensile property of metallic/FIR-PET wrapped yarns, electrical resistance of metallic/FIR-PET wrapped yarns, surface resistivity of metallic/FIR-PET woven fabrics and electromagnetic shielding effectiveness of metallic/FIR-PET woven fabric are discussed. According to the results, the optimum tenacity and elongation are chosen as 7 turns/ cm, electrical resistance of Ni-Cu/Cu/FIR-PET wrapped presents the best value, Cu/FIR-PET woven fabric has the lowest surface resistivity and Ni-Cu/Cu/FIR-PET woven fabric shows the best EMSE at 37.61 dB when the laminating-layer number is double layer and laminating at 90 ̊. In this study, three kinds of metallic/FIR-PET woven fabrics are successfully manufactured and looking forward to applying on industrial domains.

Preparation and evaluation of polyester-cotton/wire blended conductive woven fabrics for electromagnetic shielding

2021 ◽  
pp. 152808372199718
Author(s):  
Ching-Wen Lou ◽  
Yan-Ling Liu ◽  
Bing-Chiuan Shiu ◽  
Hao-Kai Peng ◽  
Jia-Horng Lin
Keyword(s):  
Performance Test ◽  
Air Permeability ◽  
Woven Fabrics ◽  
Structure Design ◽  
Electromagnetic Shielding ◽  
Surface Resistivity ◽  
Shielding Effectiveness ◽  
Weave Structure ◽  
Effectiveness Measurement ◽  
Metal Wires

For the pursuit of conductive textiles with high electromagnetic shielding performance, specified yarns are processed with a special spinning feeding device with twist counts of 40 T, 50 T, 60 T, 70 T, 80 T, and 90 T, for Next, the optimal yarns from each group are made into SS/Pc-70 and Cu/Pc-80 conductive woven fabrics with a plain weave structure design. In addition, the surface resistivity, electromagnetic shielding effectiveness measurement and air permeability of the two conductive woven fabrics were tested and analyzed. Regarding the electromagnetic shielding performance test, the effects of the complete shielding network, the lamination layers of fabric, and lamination angle on the electromagnetic shielding performance are discussed. The test results indicate that Cu/Pc-80 woven fabrics has the lowest surface resistivity, which means it has the best electrical conductivity; Moreover, different types of metal wires provide the conductive fabrics with different levels of surface resistance. The variations in the lamination angles help attain a complete conductive network that significantly enhances the EMSE, and Cu/Pc-80 have a greater average shielding value comparatively and thus greater EMSE. For both types of conductive woven fabrics, one-layered conductive woven fabrics exhibit the maximal air permeability. As the air permeability of conductive woven fabrics is correlated with the thickness of fabrics, the greater the number of lamination layers, the lower the air permeability of the conductive fabrics.

Comparison of Electroless Nickel-Plated Wood-Based EMI Composite with Two Methods of Pd Activation

2011 ◽  
Vol 183-185 ◽  
pp. 1563-1567 ◽  
Author(s):  
Hai Bing Liu ◽  
Li Juan Wang
Keyword(s):  
Electroless Nickel ◽  
Xrd Analysis ◽  
Electromagnetic Shielding ◽  
Surface Resistivity ◽  
The Other ◽  
Shielding Effectiveness ◽  
P Content ◽  
Electroless Ni ◽  
Electromagnetic Shielding Effectiveness

In this paper we prepared electroless Ni-plated wood veneers using two Pa activation methods. One is the traditional Pa colloid activation and the other uses Pa2+ions. SEM-EDS results indicated that the coatings were continuous, uniform and compact with a P content of lower than 4 wt.%. XRD analysis showed that the coatings were crystalline, which was related to the low P content. The plated wood veneers exhibit good electro-conductivity with surface resistivity of lower than 0.3 Ω cm-2and higher electromagnetic shielding effectiveness of over 60 dB in frequencies from 10 MHz to 1.5 GHz.

scholarly journals A Novel Two-Step Method for Fabricating Silver Plating Cotton Fabrics

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Hao Liu ◽  
Lili Zhu ◽  
Jie Xue ◽  
Lei Hao ◽  
Jin Li ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Nitrate Solution ◽  
Covalent Bond ◽  
Silver Ions ◽  
Cotton Fabrics ◽  
Electromagnetic Shielding ◽  
Surface Resistivity ◽  
Shielding Effectiveness ◽  
Step Method ◽  
Smart Garments

A novel two-step method was presented for fabricating silver plating cotton fabrics (SPCFs) with high electrical conductivity and excellent washing fastness. First, polydopamine (PDA) film was coated on the surface of cotton fabrics byin situpolymerization of dopamine, the silver ions in silver nitrate solution were reduced by the catechol groups of polydopamine, and silver nanoparticles were combined with polydopamine by covalent bond on the surface of cotton fabrics. Second, silver ions were reduced by glucose, and silver plating was coated on the surface. Subsequently, the properties of SPCFs were characterized by field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA), and so forth. With the increasing of silver-ammonia solution concentration or dopamine concentration, the surface resistivity of SPCFs decreases and gradually stabilized. The surface resistivity of the SPCFs can reach0.12±0.02 Ω, and electromagnetic shielding effectiveness (ESE) of the SPCFs can reach58.5±4.5 dB. Conductive fabrics have wide application prospect in many of fields, such as antibacterial, intelligent textiles, smart garments, electromagnetic shielding, and flexible sensors.

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.

Study on Multilayer Electromagnetic Shielding Coating Fabrics Based on Graphite and Nickel

2013 ◽  
Vol 677 ◽  
pp. 157-160
Author(s):  
Ying Chen ◽  
Yuan Liang Li ◽  
Xue Gang Ma ◽  
Rong Li Sang
Keyword(s):  
Electromagnetic Shielding ◽  
Surface Resistivity ◽  
Shielding Effectiveness ◽  
Water Based ◽  
Coating Method ◽  
Electromagnetic Shielding Effectiveness

Nickel and graphite are selected as conductive powders. Water-based adhesive are selected as coating. Electromagnetic shielding textiles were prepared with coating method. In order to improve the shielding effectiveness of textiles, multilayer compositing is used. The surface resistivity, coating amount, electromagnetic shielding effectiveness are tested to select the best process.

Sign in / Sign up

Export Citation Format

Share Document