Nanosilver Finishing of Composite Materials for EMSE

Perumalraj, R.; Nalankilli, G.; Arunprasath, V.K.; Dharmaraj, K.; Adithya, Sathish; Dasaradan, B S

doi:10.1177/0731684409359545

Cited by 4 publications

(4 citation statements)

References 20 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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“…[16][17][18][19][20][21][22][23][24][25][26] Stainless steel, copper, silver, carbon yarn and their combinations, the effect of fabric parameters such as weave, ends per inch (EPI), picks per inch (PPI), number of fabric layers and diameter of copper yarns were also investigated by many researches for EM shielding effectiveness. 27 It was generally observed that increase in EPI, PPI and cover factor of fabric increase the SE from 350 up to 18,000 MHz. 12 Su and Chern 16 studied shielding behavior of conductive fabrics containing three different yarns namely cover, core, and plied yarns which consist of stainless steel as core and polyester as sheath.…”

Section: Introductionmentioning

confidence: 95%

Electromagnetic Shielding and Reflection Loss of Conductive Yarn Incorporated Woven Fabrics at the S and X Radar Bands

Bahadır

Mitilineos

Symeonidis

et al. 2019

Journal of Elec Materi

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This study provides comparison of different types of conductive yarns stitched on top of the plain woven fabric via two different structures (parallel and mesh form) for electromagnetic shielding applications. Different types of structures with conductive yarns were investigated for electromagnetic shielding and reflection loss features within the S and X Radar bands. Conductive yarns; namely stainless steel, copper and silver plated polyamide yarns, having different linear resistance values were arranged evenly throughout the woven structure in parallel lines and in mesh form. The S-parameters (S 11 and S 21 ) of the woven fabrics were measured using a vector network analyzer in conjunction with a waveguide system incorporating the woven fabric samples. More specifically, the transmission line techniques with waveguides of type WR430 (WG9) and WR90 (WG16) were used; as such, the frequencies between 2.2-3.3 and 8.2-12.0 GHz were tested, respectively. Test results revealed that there is a highly varying shielding effectiveness among samples while there is also a remarkable difference with respect to shielding effectiveness between samples having mesh and parallel structure at horizontal polarizations.

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“…À35 dB) and accepted reflection attenuation from about À4 dB to À15 dB for higher frequencies. Perumalraj et al 33 have studied the nano silver finishing of composite materials for EMSE. They observed that the EMSE of silver nano finished fabrics were improved by approximately 20-55% to that of the untreated copper core yarn fabrics.…”

Section: Introductionmentioning

confidence: 99%

Nano silver conductive composite material for electromagnetic compatibility

Perumalraj¹,

Narayanan²

2014

Journal of Reinforced Plastics and Composites

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In this research work, copper wires with 0.0564 mm, 0.0502 mm, and 0.0447 mm diameters were selected as a conductive filler of core material for producing various resultant count of copper core yarn with cotton fibers and polyester fibers as sheath material. The copper core yarns with a resultant count of 118 Tex, 98 Tex, and 84 Tex were produced by G5/1 ring spinning machine with the core attachment device. From the produced copper core yarn different types of fabrics were produced by using a weaving machine. In order to improve the electromagnetic shielding effectiveness of copper core yarn woven fabrics, nano silver finishing was given. The copper core fabrics were treated by nano silver particles with various levels of nano silver concentration, ethanol, time, and copper wire diameter using Taguchi design experiments. The morphology structure, bonding nature, and size of silver nanoparticle treated copper core cotton and polyester fabrics were studied by scanning electron microscopy, energy-dispersive X-ray spectroscopy, Raman spectroscopy analyzer and X-ray diffraction. The effect of antibacterial properties of silver nano treated copper core cotton and polyester fabrics were also analyzed. X-ray diffraction and Raman spectroscopic studies have confirmed the crystalline structure of silver nanoparticle over surface of copper core cotton and polyester fabrics. Scanning electron microscopic and energy-dispersive X-ray spectroscopic studies revealed that the silver nanoparticles were formed and dispersed with spherical shape of about 30 to 50 nm. On increasing the nano silver concentration an increase in nano silver deposition and electromagnetic shielding has been observed in 500-12,000 MHz frequency range. The electromagnetic shielding effectiveness of nano silver finished fabrics were improved by 20-55% to that of the untreated copper core yarn fabrics.

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Nanosilver Finishing of Composite Materials for EMSE

Cited by 4 publications

References 20 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

Electromagnetic Shielding and Reflection Loss of Conductive Yarn Incorporated Woven Fabrics at the S and X Radar Bands

Nano silver conductive composite material for electromagnetic compatibility

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