Novel electromagnetic interference shielding effectiveness in the microwave band of magnetic nitrile butadiene rubber/magnetite nanocomposites

Abstract

A novel nitrile butadiene rubber (NBR)/ magnetite (Fe 3 O 4 ) nanocomposite for electromagnetic interference (EMI) shielding at microwave frequency was successfully fabricated. The structural features of assynthesized magnetite and NBR/Fe 3 O 4 were examined by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and energydispersive X-ray spectroscopy. The number of elastically effective chains, volume fraction of rubber, interparticle distance among conductive sites, polymer-filler interaction, and porosity of the nanocomposites were evaluated. The mechanical properties, including the tensile strength, elongation at break, and hardness, of the composites were measured. The static electrical properties, such as the elec-trical conductivity, carrier mobility, and number of charge carriers, as a function of magnetite content were evaluated. The interrelation between the electrical conductivity, shielding effectiveness (SE), dielectric constant, and skin depth of the composites are discussed. Finally, the EMI SE versus frequency was tested. The results reveal that an SE of 28-91 dB against EMI in the 1-12 GHz range depended on the loading of the conducting magnetite within the NBR matrix. Accordingly, these nanocomposites may used in the field of microwave absorption devices.

A novel facile synthesis and electromagnetic wave shielding effectiveness at microwave frequency of graphene oxide paper

“…Meanwhile, the observed interlayer spacing (d 002 ) of as synthesized GO of about 0.75 nm which corresponds to the GO (Lou et al 2014). Importantly, the increase in the interlayer space of GO is mainly ascribed to trapping of oxygen atoms and intercalated H 2 O molecules will attached to the graphite lattice and the atomic scale roughness arising from structural defects (sp3 bonding) generated on the originally atomically flat graphene sheet (Al-Ghamdi et al 2012;Liy and Oya 2014). To sum up, the X-ray results of the GO nanosheets are in good agreement with published reports available in the literatures (Panwar et al 2012).…”

Fabrication of magnetite nanoparticles/polyvinylpyrrolidone composite nanofibers and their application as electromagnetic interference shielding material

“…Magnetic materials are good potential candidates as microwave shielding due to their combination of dielectric and magnetic loss as well as controllable morphologies. 6 –8 Specially, among the available various magnetic materials, magnetite (Fe 3 O 4 ) nanoparticles are one of the most promising conduction allotropes, on the basis of their superior electrical and thermal properties comparing to other magnetic materials. 9,10 Fe 3 O 4 nanoparticles have recently attracted great attention because of their valuable properties, including extraordinary magnetic properties, low toxicity, good electrical conductivity, and nearly full spin polarization at room temperature; these properties have great potential for applications in EMI shielding/absorbing materials.…”

“…9,10 Fe 3 O 4 nanoparticles have recently attracted great attention because of their valuable properties, including extraordinary magnetic properties, low toxicity, good electrical conductivity, and nearly full spin polarization at room temperature; these properties have great potential for applications in EMI shielding/absorbing materials. 1,6,7,11 At present, Fe 3 O 4 nanoparticles have been intensively examined for their superior properties, which make them an excellent choice to fabricate magnetic polymer composite for EMI shielding at very low loading. 5,7 Various techniques have been developed to fabricate Fe 3 O 4 /polymer nanocomposites.…”

“…1,6,7,11 At present, Fe 3 O 4 nanoparticles have been intensively examined for their superior properties, which make them an excellent choice to fabricate magnetic polymer composite for EMI shielding at very low loading. 5,7 Various techniques have been developed to fabricate Fe 3 O 4 /polymer nanocomposites. 1,7,12 But, among the various methods, electrospinning is recognized as an economical method for manufacturing magnetic composite with nanofibrous structure, when compared with other techniques.…”

Electrical conductivity and percolation threshold of hybrid carbon/polymer composites

“…The resulting conductive composites can substitute metals in some application such as electromagnetic shielding, and are light weight, and corrosion resistant thus lending themselves for special applications …”