Electromagnetic shielding effectiveness of copper/glass fiber knitted fabric reinforced polypropylene composites

Cheng, K. B.; Ramakrishna, Seeram; Lee, K.C.

doi:10.1016/s1359-835x(00)00071-3

Cited by 161 publications

(96 citation statements)

References 10 publications

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“…It can be divided in two main groups: surface treatments of textiles and special types of additives incorporated into textiles. The first group includes thin mono-or two-layer coats of metal such as Ag, Cu or Ni deposited on textile surfaces [4][5][6]. Such coats are prepared by various methods, e.g.…”

Section: Introductionmentioning

confidence: 99%

Textile materials for electromagnetic field shielding made with the use of nano- and micro-technology

et al. 2012

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Abstract:Studies have been carried out aimed at the development of structures and technology for making special multi-layer textile-polymeric systems of shielding electromagnetic field (EMF). The use of textiles as EMF shielding materials is commonly known, however the EMF attenuation obtained practically exclusively results from the reflection of EMF, while the materials used for this purpose as a rule, show poor EMF absorption abilities. The basic assumption for a new solution is the exploitation of the multiple internal reflection of incident EMF either in textile-polymeric coating materials containing fine-particle electromagnetic materials or in special textile structures. This paper presents the results of investigating the EMF shielding effectiveness of several selected and developed textile-polymeric materials in respect of both their practical applications (protective clothing elements, technical materials, masking elements, etc.) and the structure and content of components with various EMF reflection and absorption properties. The measurement method for independent determination of reflection and transmission coefficients with a wavequide applicator was used. The results obtained with the 2.5 GHz to 18 GHz frequency range show a low value of transmission coefficient (min. −35 dB) and accepted reflection attenuation from about −4 dB to −15 dB for higher frequencies. PACS

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Section: Introductionmentioning

confidence: 99%

Textile materials for electromagnetic field shielding made with the use of nano- and micro-technology

et al. 2012

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“…Electromagnetic shielding effectiveness (EMSE) is described as blocking the electromagnetic fields by facilitating conductive or magnetic materials as barriers [5]. Effectiveness of a shield is influenced by the frequency of the EM, the distance of the shield from the source, the thickness of the shield and the shielding material composition.…”

Section: Introductionmentioning

confidence: 99%

Analyses of the mechanical, electrical and electromagnetic shielding properties of thermoplastic composites doped with conductive nanofillers

Yılmaz

Özen

Sancak

et al. 2018

Journal of Composite Materials

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The purpose of this study is to observe effect of incorporating vapor grown carbon nanofibers with various amounts in polyvinylidene fluoride matrix in terms of mechanical strength and electromagnetic shielding effectiveness. Thermoplastic conductive nanocomposites were prepared by heat pressed compression molding. Vapor grown carbon nanofibers were utilized at various weight ratios (1 wt. %, 3 wt. %, 5 wt. % and 8 wt. %) as conductive and reinforcing materials. Polyvinylidene fluoride was used as a thermoplastic polymer matrix. SEM analysis was conducted in order to characterize the morphology and structural properties of the nanocomposites and results revealed well dispersion of carbon nanofibers within the matrix for all concentrations. Mechanical characteristics were investigated according to standards. Findings proved that overall increments of 16%, 37,5% and 56% were achieved in terms of tensile strength, elasticity modulus and impact energy, *: Corresponding author E-mail: acyilmaz@cu.edu.tr 1 respectively where a total reduction of 44.8% was observed in terms of elongation for 8 wt.% vapor grown nanofiber matrix compared to that of 0 wt.%. Electromagnetic shielding effectivenesses of the nanocomposites were determined by standard protocol using coaxial transmission line measurement technique in the frequency range of 15-3000 MHz. It was observed that resistance, sheet resistance and resistivity of nanocomposites depicted substantial reduction with the increment of nanofiber content. Nevertheless, it was observed that nanofiber content, dispersion and network formation within the composites were highly influent on the electromagnetic shielding effectiveness performance of the structures.

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“…The textile metallization can also significantly improve the electrical conductivity and antistatic properties through conducting electricity and reducing static shock on insulated textiles [7,8]. Moreover, the electromagnetic interference (EMI) is becoming the fourth kind of public space pollution in addition to noise, water and air pollution [1,9]. The EMI is a well-known problem for commercial and scientific electronic instruments, antenna systems and military electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Rejection of far infrared radiation from the human body using Cu–Ni–P–Ni nanocomposite electroless plated PET fabric

et al. 2017

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An experimental investigation was utilized to present the IR rejection performance of Cu-Ni-P-Ni composite double-layer electroless plated PET fabric compared to fabric samples composed of Cu-Ni-P metallic monolayer. Accordingly, the effect of a range of operational parameters was explored on the conductivity of electroless plated PET fabric. Results indicate higher conductivity and lower durability for Cu-Ni-P-coated samples compared to its counterpart with same sub-layer included with nickel on top layer. The SEM image of CuNi-P particle on PET fabric shows a hexagonal non-homogenous morphology with nanoscale crack on its surface. However, the micrograph of the Cu-Ni-P-Ni electroless plated fabric shows an extremely compact and continuous phase with clear boundaries containing semispherical particles. The thermopile radiated sensing system was used as a sophisticated device to show the thermal energy absorption level. The acquired data indicate a 2.3 and 2.7 unit reduction in transmitted radiated power, respectively, for Cu-Ni-P and Cu-Ni-P-Ni conducting fabric. The captured thermal camera images of human body while keeping in front of a Cu-Ni-P conducting fabric revealed a nearly black and blue feature which proves the significant decrease in body radiated thermal energy. However, the thermal image of Cu-Ni-P-Ni conductive fabric shows almost black appearance in all areas. It can be presumably due to improving of the IR rejection performance and also formation of a massive barrier against body thermal radiation for promising camouflage applications.

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Electromagnetic shielding effectiveness of copper/glass fiber knitted fabric reinforced polypropylene composites

Cited by 161 publications

References 10 publications

Textile materials for electromagnetic field shielding made with the use of nano- and micro-technology

Textile materials for electromagnetic field shielding made with the use of nano- and micro-technology

Analyses of the mechanical, electrical and electromagnetic shielding properties of thermoplastic composites doped with conductive nanofillers

Rejection of far infrared radiation from the human body using Cu–Ni–P–Ni nanocomposite electroless plated PET fabric

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