Light-weight and flexible silicone rubber/MWCNTs/Fe3O4 nanocomposite foams for efficient electromagnetic interference shielding and microwave absorption

Highly Deformable Porous Electromagnetic Wave Absorber Based on Ethylene–Propylene–Diene Monomer/Multiwall Carbon Nanotube Nanocomposites

“…Hence, the use of rubber matrices could potentially reduce these shortcomings. Some studies have also reported adequate EMI shielding features of rubber nanocomposite foams, in particular, natural rubber (NR) filled with multiwall carbon nanotubes (MWCNTs) [21] and silicone rubber filled with MWCNTs/ferriferous oxide (Fe 3 O 4 ) [22]. Zhan et al fabricated closed-cell NR nanocomposite foams using supercritical CO 2 and observed improved electrical, EMI shielding, and compressive properties [21].…”

“…Zhan et al fabricated closed-cell NR nanocomposite foams using supercritical CO 2 and observed improved electrical, EMI shielding, and compressive properties [21]. Yang et al investigated the effect of MWCNTs/Fe 3 O 4 and reported average EM absorptions of up to 64% in the X-band [22].…”

NiFe2O4 Nanoparticles Synthesized by Dextrin from Corn-Mediated Sol–Gel Combustion Method and Its Polypropylene Nanocomposites Engineered with Reduced Graphene Oxide for the Reduction of Electromagnetic Pollution

“…26,27 The natural resonance, eddy current loss, and hysteresis losses generated by NiFe 2 O 4 spinel ferrite can provide efficient magnetic loss in shielding material to efficiently absorb the electromagnetic waves. 28 Reduced graphene oxide exhibits a high dielectric loss; therefore, it provides attenuation characteristics to electromagnetic waves because of its high conductivity. 29 The combination of conducting reduced graphene oxide and spinel ferrite can provide high dielectric and magnetic loss in the polymer matrix, which can generate efficient electromagnetic interference shielding composite material.…”

Preparation and Characterization of Highly Elastic Foams with Enhanced Electromagnetic Wave Absorption Based On Ethylene-Propylene-Diene-Monomer Rubber Filled with Barium Titanate/Multiwall Carbon Nanotube Hybrid

“…Hence, we calculated the extent of improvement reported on foamed nanocomposites filled with hybrid fillers as a way to establish a comparative analysis ( Table 2 ). It can be observed that our synthesized EPDM foam filled with BT/MWCNTs (20/10 phr) shows the highest percentage of improvement for SE T (40%), compared to the other polymeric foams reported by others [ 7 , 13 , 34 , 44 , 49 , 50 ].…”

“…Therefore, the total SE (SET) can be expressed as follows [ 41 , 42 ]: SE T = SE A + SE R + SE M where SE A , SE R , and SE M are the shielding effectivenesses by absorption, reflection, and multiple reflections, respectively, which are defined as [ 42 ]: SE T = 10log(P i /P t ) SE A = 20loge t/ σ SE R = 39.5 + 10log(σ/2fπμ) SE M = 20log(1 − e −2t/δ ) where Pi, Pt, σ, f, μ, and δ are the incident and transmitted power, conductivity, frequency, permeability, and skin depth, respectively. Since the shield thickness of the developed foams is greater than skin depth (defined as the distance from the surface of the shield where the EM energy has dropped to 1/e of its initial value at the surface) [ 42 ], the effect of multiple reflections can be overlooked [ 43 , 44 ]. The three SE parameters were calculated ( Figure 6 ) for our tested samples with the thickness of 9 mm over the X-band frequencies [ 41 ].…”