Exceptional Electromagnetic Shielding Properties of Lightweight and Porous Multifunctional Layers

Militký, Jiřı́; Dana, Kausik; Venkataraman, Mohanapriya; Večerník, Josef

doi:10.1021/acsaelm.0c00109

Cited by 7 publications

(6 citation statements)

References 25 publications

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“…In addition to Cu, oxygen (O), carbon (C), calcium (Ca), and titanium (Ti) are visible, and their concentration is presented in Figure 5 . The presence of titanium is due to the matting of polyester by TiO 2 before creating a MILIFE structure [ 22 ]. It is observed that the copper coating is not continuous, but distances between coated parts are over the percolation threshold.…”

Section: Resultsmentioning

confidence: 99%

Ultrathin Multilayer Textile Structure with Enhanced EMI Shielding and Air-Permeable Properties

Wang

Periyasamy

et al. 2021

Polymers

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A textile material’s electromagnetic interference (EMI) shielding effectiveness mainly depends on the material’s electrical conductivity and porosity. Enhancing the conductivity of the material surface can effectively improve the electromagnetic shielding effectiveness. However, the use of highly conductive materials increases production cost, and limits the enhancement of electromagnetic shielding effectiveness. This work aims to improve the EMI shielding effectiveness (EMSE) by using an ultrathin multilayer structure and the air-permeable textile MEFTEX. MEFTEX is a copper-coated non-woven ultrathin fabric. The single-layer MEFTEX SE test results show that the higher its mass per unit area (MEFTEX 30), the better its SE property between 56.14 dB and 62.53 dB in the frequency band 30 MHz–1.5 GHz. Through comparative testing of three groups samples, a higher electromagnetic shielding effect is obtained via multilayer structures due to the increase in thickness and decrease of volume electrical resistivity. Compared to a single layer, the EMI shielding effectiveness of five layers of MEFTEX increases by 44.27–83.8%. Due to its ultrathin and porous structure, and considering the balance from porosity and SE, MEFTEX 10 with three to four layers can still maintain air permeability from 2942 L/m2/s–3658 L/m2/s.

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Section: Resultsmentioning

confidence: 99%

Ultrathin Multilayer Textile Structure with Enhanced EMI Shielding and Air-Permeable Properties

Wang

Periyasamy

et al. 2021

Polymers

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“…The copper deposit was about 3 g·m −2 , dependent on the planar weight of Milife. Copper-coated Milife has enhanced reflectance in the FIR region, and untreated Milife is sufficiently transparent for the NIR range (sun radiation) [ 26 ]. The structure of copper-coated Milife is shown in Figure 1 .…”

Section: Methodsmentioning

confidence: 99%

Sandwich Structures Reflecting Thermal Radiation Produced by the Human Body

et al. 2021

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Far infrared (FIR) textiles are a new category of functional textiles that have presumptive health and well-being functionality and are closely related to human thermo-physiological comfort. FIR exerts strong rotational and vibrational effects at the molecular level, with the potential to be biologically beneficial. In general, after absorbing either sunlight or heat from the human body, FIR textiles are designed to transform the energy into FIR radiation with a wavelength of 4–14 μm and pass it back to the human body. FIR textiles can meet increased demand for light, warm, comfortable, and healthy clothing. The main aim of this research is to describe the procedure for creating the FIR reflective textile layer as part of multilayer textile structures that have enhanced thermal protection. To develop the active FIR reflecting surface, the deposition of copper nanolayer on lightweight polyester nonwoven structure Milife, which has beneficial properties of low fiber diameters, good shape stability and comfort, was used. This FIR reflective layer was used as an active component of sandwiches composed of the outer layer, insulation layer, active layer, and inner layer. The suitable types of individual layers were based on their morphology, air permeability, spectral characteristics in the infra-red region, and thermal properties. Reflectivity, transmittance, and emissivity were evaluated from IR measurements. Human skin thermal behavior and the prediction of radiation from the human body dependent on ambient conditions and metabolic rate are also mentioned. The FIR reflective textile layer created, as part of multilayer textile structures, was observed to have enhanced thermal protection.

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“…Both layers are thermally bonded together (see Figure 6 a). MILIFE is a promising material for surface metals deposition because it is composed of a dense network of monofilaments connected by fixed points [ 22 , 23 ]. Plasma pretreatment with autocatalytic activation can be used for copper deposition (see Figure 6 b) from a strong alkaline bath containing copper salts and a reduction agent (borohydride).…”

Section: Literature Reviewmentioning

confidence: 99%

“…Plasma pretreatment with autocatalytic activation can be used for copper deposition (see Figure 6 b) from a strong alkaline bath containing copper salts and a reduction agent (borohydride). The copper surface concentration is about 3 g m −2 [ 23 ].…”

Section: Literature Reviewmentioning

confidence: 99%

A Review of Impact of Textile Research on Protective Face Masks

et al. 2021

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COVID-19, classified as SARS-CoV-2, is causing an ongoing global pandemic. The pandemic has resulted in the loss of lives and has caused economic hardships. Most of the devices used to protect against the transmission of the novel COVID-19 disease are related to textile structures. Hence, the challenge for textile professionals is to design and develop suitable textile structures with multiple functionalities for capturing viruses, passivating them, and, at the same time, having no adverse effects on humans during the complete period of use. In addition to manufacturing efficient, biocompatible, and cost-effective protective face masks, it is also necessary to inform the public about the benefits and risks of protective face mask materials. The purpose of this article is to address the concerns of efficiency and efficacy of face masks by primarily reviewing the literature of research conducted at the Technical University of Liberec. The main focus is on the presentation of problems related to the specification of aims of face mask applications, mechanisms of capture, durability, and modes of sterilization. The recommendations, instead of conclusions, are addressed to the whole textile society because they should be leading players in the design, creation, and proper treatment of face masks due to their familiarity with the complex behavior of textile structures and targeted changes of structural hierarchy starting from polymeric chains (nano-level) and ending in planar textile structures (millimeter level) due to action by mechanical, physical and chemical fields. This becomes extremely critical to saving hundreds of thousands of lives from COVID-19.

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Exceptional Electromagnetic Shielding Properties of Lightweight and Porous Multifunctional Layers

Cited by 7 publications

References 25 publications

Ultrathin Multilayer Textile Structure with Enhanced EMI Shielding and Air-Permeable Properties

Ultrathin Multilayer Textile Structure with Enhanced EMI Shielding and Air-Permeable Properties

Sandwich Structures Reflecting Thermal Radiation Produced by the Human Body

A Review of Impact of Textile Research on Protective Face Masks

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