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 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.

Surface Coatings Based on Carbon Paper and its Electromagnetic Shielding Property

2011 ◽  
Vol 236-238 ◽  
pp. 1261-1264
Author(s):  
Zhi Jun Hu ◽  
Jiang Lin ◽  
Jing An Yu
Keyword(s):  
Carbon Fiber ◽  
Coating Layer ◽  
Magnetic Loss ◽  
Interaction Mechanism ◽  
Electromagnetic Shielding ◽  
Carbon Paper ◽  
Shielding Effectiveness ◽  
Coating Method ◽  
Carbon Fiber Paper ◽  
Conductive Properties

Carbon fiber paper was coated with multiple layers coating composed by conductive and magnetic fillers. The electromagnetic shielding and conductive properties of the coating were investigated. The effluencing factors such as the ratio of conductive and magnetic fillers, the composition of magnetic fillers, the contrast of coating method, the structure of shielding layer were assessed according with effectiveness. The results showed the best component for the coating layer was: conductive substrate, conductive coating layer and magnetic coating layer sequently. The compound of magnetic fillers with differenet electromagnetic interaction mechanism would produce a complementary magnetic loss, and display a high absorption in broader frequency band. The shielding effectiveness of multi-layer coated carbon fiber paper at 1.5 GHz was shown up to 45 dB.

A simple, repeatable and highly stable self-powered solar-blind photoelectrochemical-type photodetector using amorphous Ga2O3 films grown on 3D carbon fiber paper

2021 ◽  
Author(s):  
Lijuan Huang ◽  
Zhengrui Hu ◽  
Hong Zhang ◽  
Yuanqiang Xiong ◽  
Shiqiang Fan ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Gallium Oxide ◽  
Three Dimensional ◽  
Next Generation ◽  
Solar Blind ◽  
Carbon Fiber Paper ◽  
Deep Ultraviolet ◽  
Self Powered ◽  
Ultraviolet Photodetectors

Gallium oxide (Ga2O3) has been extensively studied in recent years because it is a natural candidate material for next-generation solar-blind deep ultraviolet photodetectors (PDs). Herein, a three dimensional (3D) amorphous...

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.

The effects of the structural parameters of three-dimensional warp interlock woven fabrics with silver-based hybrid yarns on electromagnetic shielding behavior

2019 ◽  
Vol 90 (11-12) ◽  
pp. 1354-1371
Author(s):  
Marzieh Javadi Toghchi ◽  
Carmen Loghin ◽  
Irina Cristian ◽  
Christine Campagne ◽  
Pascal Bruniaux ◽  
...  
Keyword(s):  
Unit Area ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Woven Fabrics ◽  
Electromagnetic Shielding ◽  
Woven Fabric ◽  
Shielding Effectiveness ◽  
Conductive Material ◽  
Conductive Yarns ◽  
Multifilament Yarns

The main objective of the present study was to investigate the increase in the electromagnetic shielding effectiveness (EMSE) of a set of five variants of three-dimensional (3D) warp interlock woven fabrics containing silver multifilament yarns arranged in a 3D orthogonal grid. The EMSE enlargement as a factor of increasing the quantity of the conductive material per unit area was investigated. The quantity of the conductive material per unit area in a 3D woven fabric can be enlarged by increasing either the yarn undulation or the number of conductive yarn systems, while the yarn density and yarn fineness are fixed. Thus, the binding depth of the conductive warp was gradually increased for the first four variants in order to increase the yarn undulation. Alternatively, the conductive weft system was doubled for the last variant with the aim of increasing the quantity of the conductive component. It should be noted that changing the weave structure requires less effort and energy while keeping the same threading of warps in the reed compared to altering the warp density. The EMSE was measured in an anechoic chamber and the shielding was satisfactory for all the variants in the frequency range of 1–6 GHz (19–44 dB). The results revealed that increasing only 7% of the waviness degree of the conductive warps led to 17% EMSE improvement due to increasing of the conductive yarns through the thickness of the variants. Moreover, no upward EMSE was detected for the last variant, despite the fact that the conductive weft system was doubled.

Electromagnetic shielding performance of three-dimensional woven fabrics with copper-based hybrid yarn in X-band frequency range

2018 ◽  
Vol 49 (4) ◽  
pp. 484-502 ◽  
Author(s):  
Dharmendra Nath Pandey ◽  
Arindam Basu ◽  
Pramod Kumar ◽  
Himangshu B Baskey
Keyword(s):  
Cotton Fabric ◽  
Three Dimensional ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Frequency Range ◽  
Structural Configuration ◽  
Band Frequency ◽  
Hybrid Yarn ◽  
X Band ◽  
Electromagnetic Shielding Effectiveness

This study involves a comprehensive evaluation of electromagnetic shielding characteristics of multilayer three-dimensional conductive fabrics by using cotton/copper wrapped hybrid yarn in X band frequency range. Five, three-dimensional fabrics with different structural configuration, such as orthogonal, angle interlock, cellular spacer, multi-tubular spacer, and contour were produced. Three different series of all five structures was also developed using pure cotton fabric, conductive hybrid yarn in weft and one-third hybrid yarn and two-third cotton yarn in warp Also, the effect of vertical and horizontal polarization of electromagnetic waves on electromagnetic shielding effectiveness was studied. The comparative analysis of reflectance transmittance and absorption behavior was also undertaken. The results indicate that pure cotton fabric (A series) does not have electromagnetic shielding capabilities. The difference between the electromagnetic shielding effectiveness values in vertical and horizontal planes of fabrics, having conductive hybrid yarn in weft direction (B series), showed significantly better results on the vertical plane in comparison to that on the horizontal plane. Fabric containing conductive hybrid yarn in both warp and weft (C series) exhibits consistent electromagnetic shielding effectiveness in both the planes. It is worth mentioning that the structural configuration in all five three-dimensional fabrics in B and C series has shown differential trends of electromagnetic shielding effectiveness in terms of reflectance, transmittance and absorption behavior. They are also found to be statistically significant. Finally, it is concluded that the conductive 3-D multilayer system develops special protective capabilities, mostly due to its larger surface area.

Measurement of Electromagnetic Shielding Effectiveness of the Composite Carbon Fibers/Nickel Thin Film

2010 ◽  
Vol 437 ◽  
pp. 580-583
Author(s):  
Ho Chang ◽  
Yun Min Yeh ◽  
Ching Song Jwo ◽  
Sih Li Chen
Keyword(s):  
Carbon Fiber ◽  
Average Particle Size ◽  
Composite Films ◽  
Waterborne Polyurethane ◽  
Electromagnetic Shielding ◽  
Average Particle ◽  
Shielding Effectiveness ◽  
Conductive Composite ◽  
Blending Method ◽  
Electromagnetic Shielding Effectiveness

This paper presents the development of a conductive composite film and the measurement of electromagnetic (EM) shielding effectiveness (SE) of the prepared film. A coaxial transmission-line technique based on ASTM D4935-99 Standard was used to measure the electromagnetic shielding effectiveness. A nickel nanofluid with an average particle size of 50 nm was prepared with a self-developed nanofluid synthesis system. By using a polymer blending method, carbon fiber and carbon fiber/nickel nanoparticles were blended with waterborne polyurethane (WPU) to prepare conductive composite films of 0.25 mm thick. Experimental results have shown that the electromagnetic shielding effectiveness value of the prepared conductive composite material can reach 26 dB within the range of 50 MHz ~ 1.5GHz.

Digital description model of a three-dimensional arrangement structure of conductive fiber of electromagnetic shielding fabric

2017 ◽  
Vol 29 (1) ◽  
pp. 14-24 ◽  
Author(s):  
Xiuchen Wang ◽  
Yaping Li ◽  
Ying Su ◽  
Zhen Pan ◽  
Zhe Liu
Keyword(s):  
Feature Extraction ◽  
Complex Structure ◽  
Three Dimensional ◽  
Electromagnetic Shielding ◽  
Electromagnetic Properties ◽  
Shielding Effectiveness ◽  
Content Type ◽  
Conductive Fiber ◽  
Feature Parameters ◽  
Conductive Fibers

Purpose The three-dimensional arrangement structure of the conductive fiber is an important factor of the shielding effectiveness of the electromagnetic shielding fabric (EMSF). However, until now, the three-dimensional arrangement structure has not been described because of the complex structure, which leads to many difficulties for the subsequent analysis of the electromagnetic characteristics. Therefore, the purpose of this paper is to propose a feature extraction method to describe the arrangement structure of the conductive fiber based on the three-dimensional calibration and image processing technology, providing a new idea for the above problem. Design/methodology/approach First, the three-dimensional positions of the conductive fibers in the EMSF are calibrated using the VHX-600 3D digital microscope and the MATLAB7.5 software. The arrangement characteristics of the conductive fibers are analyzed, and equivalent twist, cross-sectional content, and average angle of a single fiber are proposed to describe the arrangement characteristic of the conductive fiber. Then, a digital description model of the conductive fiber is constructed according to the feature parameters and its three-dimensional structures are reproduced using CATIA. Finally, the reliability of the model is verified by an FDTD example, and the significance and application of the model are given. Findings The proposed method can provide the feature extraction and description for the complex spatial three-dimensional arrangement structure of conductive fibers. The feature parameters can reflect different micro arrangement features of the conductive fiber. The proposed idea and method can provide a solid foundation for subsequent studies of the electromagnetic properties of the EMSF. Originality/value The study in this paper is of great significance and academic value. This paper provides a new three-dimensional calibration method and constructs multiple feature parameters to describe the complex three-dimensional arrangement structure, providing a new effective method to overcome the problem of the conductive fiber description. The proposed method provides an important basis for the shielding mechanism, transmission characteristics, electromagnetic calculation and product design, and woven technology of the EMSF.

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