Contact surface resistivity: its effect on shielding effectiveness

2004 ◽  
Author(s):  
E. Nakauchi ◽  
G. Fenical
Keyword(s):  
Contact Surface ◽  
Surface Resistivity ◽  
Shielding Effectiveness

scholarly journals Robust Design of PC/ABS Filled with Nano Carbon Black for Electromagnetic Shielding Effectiveness and Surface Resistivity

Processes ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 616
Author(s):  
Wipoo Sriseubsai ◽  
Arsarin Tippayakraisorn ◽  
Jun Wei Lim
Keyword(s):  
Carbon Black ◽  
Electromagnetic Interference ◽  
Electrostatic Discharge ◽  
Acrylonitrile Butadiene Styrene ◽  
Surface Resistivity ◽  
Shielding Effectiveness ◽  
Electromagnetic Interference Shielding Effectiveness ◽  
Electromagnetic Shielding Effectiveness ◽  
Emi Se ◽  
Butadiene Styrene

This study focuses on the electromagnetic interference shielding effectiveness (EMI SE), dissipation of electrostatic discharge (ESD), and surface resistivity of polymer blends between polycarbonate (PC) and acrylonitrile–butadiene–styrene (ABS) filled with carbon black powder (CBp) and carbon black masterbatch (CBm). The mixtures of PC/ABS/CB composites were prepared by the injection molding for the 4-mm thickness of the specimen. The D-optimal mixture design was applied in this experiment. The EMI SE was measured at the frequency of 800 and 900 MHz with a network analyzer, MIL-STD-285. The result showed that the EMI SE was increased when the amount of filler increased. The surface resistivity of the composites was determined according to the ASTM D257. It was found that the surface resistivity of the plastic with no additives was 1012 Ω/ square. When the amount of fillers was added, the surface resistivity of plastic composites decreased to the range of 106–1011 Ω/square, which was suitable for the application without the electrostatic discharge. The optimization of multi-response showed using high amounts of PC and CB was the best mixture of this research.

Non-contact surface resistivity tester for materials from 107 to 1011 Ω

2019 ◽  
Vol 98 ◽  
pp. 17-24
Author(s):  
Kazuki Numayama ◽  
Toshiyuki Sugimoto ◽  
Koichi Taguchi
Keyword(s):  
Contact Surface ◽  
Surface Resistivity

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.

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