Multi-layered composites using polyurethane-based foams and 3D-printed structures to curb electromagnetic pollution

Abstract

Herein, a comparative study of the electromagnetic interference (EMI) shielding performance of multi-layered architectures fabricated using different strategies (i.e., polyurethane (PU)-based film, foam, and 3D printed structures) has been evaluated....

Absorption Dominated Directional Electromagnetic Interference Shielding through Asymmetry in a Multilayered Construct with an Exceptionally High Green Index

“…It is to be noted that PC−CNT film was prepared using a solution mixing−compression molding technique (refer to Figure S2), and the exact details are described in our previous work. 38 Neat PC films were prepared similarly by compression molding the commercial PC beads (no fillers) at 260 °C. Also, the layers were consolidated using an epoxy-based adhesive similar to our previous work.…”

‘Template-free’ synthesis of self-assembled micro-spikes resulting in ‘sea-urchin’-like carbon structures for suppressing electromagnetic radiation

“…The SE values are practically determined from scattering parameters (i.e., S 11 , S 22 , S 12 , and S 21 ) obtained from the VNA data, as shown in eqn ( 5)-( 7): SE T ¼ 10 log 10 1 S 21 j j 2 ¼ 10 log 10 1 S 12 j j 2…”

“…To incorporate magnetic /conducting /dielectric fillers, researchers are opting for a hybrid approach or architectural tweaking. A single monolith with nano-flakes dispersed in a matrix is not amenable to meeting the stringent requirements; hence, the research is focused on designing hybrid, core-shell and multilayered structures, etc 7,10,22,23 . However, such strategies involve cumbersome synthesis procedures and too many parameters that require precise control.…”

“…A single monolith with nano-flakes dispersed in a matrix is not amenable to meeting the stringent requirements; hence, research has focused on designing hybrid, core-shell, and multilayered structures. 7,10,22,23 However, such strategies involve cumbersome synthesis procedures and too many parameters that require precise control. Among the various fillers that have been researched, carbon-based nanofillers, such as carbon nanotubes (CNTs), graphene, and carbon fibers (CFs), have attracted a great deal of attention for designing efficient shielding materials and effectively reinforcing composites.…”

“…Conventionally, metals and metallic composites have been used extensively as EMI shielding materials because of their high conductivity, which makes them good reflectors due to the availability of a large number of free electrons. 10,11 The main drawback of using metals as shielding materials is that the electric field inside the metal is zero; therefore, the incoming EM waves are reflected/scattered back into the environment, which can further disturb the functioning of nearby devices. Apart from this, metals suffer from several other issues, like having a high density, being prone to corrosion, having poor chemical resistance, and creating processing difficulties.…”