Multifunctional Nanocellulose/Carbon Nanotube Composite Aerogels for High-Efficiency Electromagnetic Interference Shielding

Abstract

Bio-based specialized components have emerged as a promising trend to limit the use of petroleum derivatives. Conversely, the current use of electronic systems has conditioned the emission of electromagnetic waves that interfere with high-precision devices and harm human health. Thus, robust, ultralight, and conductive nanocellulose-based aerogels paired with carbon nanotubes appear as an electromagnetic interference (EMI) shielding biomaterial to reduce the dispersion of microwaves emitted or received from a device. This study proposes a reliable aerogel system to deflect radiation by integrating TEMPO-oxidized cellulose nanofibrils, cationic cellulose nanocrystals, and sodium alginate, with carbon nanotubes at various concentrations. After inducing gelation, the aerogels were obtained by freeze drying. According to zeta potential and FTIR analysis data of nanocellulose, the aerogel frame was induced by electrostatic attraction and hydrogen bonds between the cellulosic matrix and the nanofillers. Finally, lightweight (density < 0.075 g/cm3), highly porous (porosity > 95.47%), conductive (up to 26.2 S/m), mechanically resistant, and EMI-protective aerogels were obtained, proving their potential to be used as green and lightweight shielding elements against electromagnetic radiation.

Segregated MWCNT Structure Formation in Conductive Rubber Nanocomposites by Circular Recycling of Rubber Waste

“…This might be attributed to destruction of molecular structure during the reclaiming process. The effective formation of segregated CNT structure and the low percolation threshold in HX-RR can be an advantage for flexible strain sensor ,, and EMI shielding applications. , The utilization of recycled rubber to fabricate conductive rubber not only reduces the production cost but also promotes a circular economy model.…”

Fabrication of Ni-Encapsulated Carbon Tube/Poly(dimethylsiloxane) Composite Materials for Lightweight and Flexible Electromagnetic Interference Shielding Material

“…All of the experimental materials except cotton were purchased from Aladdin Chemical Reagent Company (China) and used without further purification. The cotton was composed of 80% cotton and 20% polyester, and was bought from Wanchang Weaving Co., Ltd. (Jinzhou, China); the gram weight was 105 g/m 2 .…”

“…Both of the two techniques could enable more EM waves to enter the shielding materials instead of reflection with increasing EM absorption. [1][2][3]6,22 Up to the present, although research on and companies manufacturing the lower-reflection shielding (SE R ) materials have made considerable progress, the major shortcoming is the tension between performance and density. 6−9,12−16 In this study, a textured porous conductive material was fabricated by electroless nickel plating (ECP-Ni) and carbonization technology and used as EM shielding material (An cotton).…”

Advanced applications of cellulose nanocrystals: a mini review

“…Increase EMI shielding effectiveness for application in which beside thermal insulation, shielding is also required , the cover also needs to provide shield against penetration for electromagnetic waves. Study in ref 214 , suggested an effective aerogel method to block radiation by combining sodium alginate, cationic CNCs, and TEMPO-oxidized cellulose nanofibrils with carbon nanotubes at different concentrations.…”