Related Papers
POLYMERS
A Facile Approach to Produce Activated Carbon from Waste Textiles via Self-Purging Microwave Pyrolysis and FeCl 3 Activation for Electromagnetic Shielding Applications
2024 •
Sema Sert
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Materials
Activated Carbon Derived from Carbonization of Kevlar Waste Materials: A Novel Single Stage Method
2021 •
jiri militky
The augmented demands of textile materials over time have brought challenges in the disposal of substantial volumes of waste generated during the processing and end of life of such materials. Taking into consideration environmental safety due to discarding of textile waste, it becomes critical to recuperate useful products from such waste for economic reasons. The present work deals with the preparation of porous and electrically conductive activated carbon fabric by a novel single stage method of simultaneous carbonization and physical activation of Kevlar feedstock material procured from local industries, for effective electromagnetic (EM) shielding applications. The Kevlar fabric waste was directly carbonized under a layer of charcoal without any intermediate stabilization step at 800 °C, 1000 °C, and 1200 °C, with a heating rate of 300 °C/h and without any holding time. The physical and morphological properties of the activated carbon, influenced by carbonization process paramet...
C
Joule Heating of Carbon-Based Materials Obtained by Carbonization of Para-Aramid Fabrics
2023 •
jiri militky
Electrical Properties and Electromagnetic Interference Shielding Effectiveness of Interlayered Systems Composed by Carbon Nanotube Filled Carbon Nanofiber Mats and Polymer Composites
Utpal Basuli
Nano-Micro Letters
Biomass-Derived Carbon Heterostructures Enable Environmentally Adaptive Wideband Electromagnetic Wave Absorbers
Ufuoma Kara
Although advances in wireless technologies such as miniature and wearable electronics have improved the quality of our lives, the ubiquitous use of electronics comes at the expense of increased exposure to electromagnetic (EM) radiation. Up to date, extensive efforts have been made to develop high-performance EM absorbers based on synthetic materials. However, the design of an EM absorber with both exceptional EM dissipation ability and good environmental adaptability remains a substantial challenge. Here, we report the design of a class of carbon heterostructures via hierarchical assembly of graphitized lignocellulose derived from bamboo. Specifically, the assemblies of nanofibers and nanosheets behave as a nanometer-sized antenna, which results in an enhancement of the conductive loss. In addition, we show that the composition of cellulose and lignin in the precursor significantly influences the shape of the assembly and the formation of covalent bonds, which affect the dielectric...
Journal of Materials Science
Lightweight and highly conductive silver nanoparticles functionalized meta-aramid nonwoven fabric for enhanced electromagnetic interference shielding
2021 •
Xin Ning
Applied Surface Science
Self-bonded natural fiber product with high hydrophobic and EMI shielding performance via magnetron sputtering Cu film
2019 •
Sheldon Shi
Materials
Electromagnetic Shielding by MXene-Graphene-PVDF Composite with Hydrophobic, Lightweight and Flexible Graphene Coated Fabric
Cheol-Min Yang
MXene and graphene based thin, flexible and low-density composite were prepared by cost effective spray coating and solvent casting method. The fabricated composite was characterized using Raman spectroscopy, X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray (EDX). The prepared composites showed hydrophobic nature with higher contact angle of 126°, −43 mN·m−1 wetting energy, −116 mN·m−1 spreading Coefficient and 30 mN·m−1 lowest work of adhesion. The composites displayed excellent conductivity of 13.68 S·cm−1 with 3.1 Ω·sq−1 lowest sheet resistance. All the composites showed an outstanding thermal stability and constrain highest weight lost until 400 °C. The MXene-graphene foam exhibited excellent EMI shielding of 53.8 dB (99.999%) with reflection of 13.10 dB and absorption of 43.38 dB in 8–12.4 GHz. The single coated carbon fabric displayed outstanding absolute shielding effectiveness of 35,369.82 dB·cm2·...
Chemistry of Materials
Recent Advances in 2D MXene Integrated Smart-Textile Interfaces for Multifunctional Applications
2020 •
Milon Hossain
Applied Nanoscience
Effect of chlorination with carbon tetrachloride on the interaction of carbon fibers with electromagnetic radiation in the ultrahigh-frequency band
2023 •
Vladyslav Lisnyak
Polyacrylonitrile-based carbon fibers (PAN CFs) were chlorinated with carbon tetrachloride vapor at 300 °C, 450 °C, and 600 °C. The surface chlorine concentration in the chlorinated PAN CFs increased from 1.82 to 3.73 mmol g-1 with increasing temperature. The chlorinated PAN CFs were characterized by SEM, TEM, and FTIR-ATR methods. The surface morphology is preserved after chlorination at the SEM characterization level; the HRTEM shows the formation of nanoscale surface carbon structures. FTIR-ATR showed the oxidation of the carbon surface and the formation of carbon-oxygen groups. From the TGA and TPD MS analysis of HCl vacuum thermodesorption below 800 °C, the most thermally stable CCl 3 groups were proposed as the source of HCl gas, and their highest concentration corresponds to the highest chlorination temperature. From the results of electromagnetic shielding studies, higher chlorination temperature increases the attenuation parameter S 21 and reflection coefficient S 11 measured for a layer of the chlorinated PAN ACFs over the X-band and Ka-band frequencies. Both the S 21 and S 11 parameters have nearly constant values over a wide range of frequencies. This behavior can be used to construct the latest generation of microwave attenuators with attenuation controlled by chlorination, and they are also promising microwave absorbers for the protection of biological objects.
