Microwave Absorption and EMI Shielding Behavior of Nanocomposites Based on Intrinsically Conducting Polymers, Graphene and Carbon Nanotubes

Saini, Parveen; Arora, Manju

doi:10.5772/48779

Cited by 160 publications

(140 citation statements)

References 58 publications

(143 reference statements)

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“…This paper purpose a composite material that consist in a mixture of polypropylene with multi-walled carbon nanotubes, which would result in a material with better mechanical and physical properties. These properties can be improved by varying the percentage of the conductive inclusions (MWCNT's) in the base polymer (PP) matrix [1,5].…”

Section: Methodsmentioning

confidence: 99%

“…The designing of an EMI screen with a desired level of effectiveness, meeting a set of physical criteria, maintaining economics limits and regulating the involved shielding mechanism is not a straight forward task and also involves complex interaction of inherent characteristics (dielectric properties) of shielding material and logical selection of extrinsic parameters. Therefore, to touch the theoretically desired shielding performance of a materials and to satisfy complex design criteria, elementary knowledge of shielding theory, set of governing theoretical equations, important design parameters and relevant measurement technique must be studied with carefully [1].…”

Section: Introductionmentioning

confidence: 99%

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Dielectric and Electromagnetic Behavior of Conductive Nanocomposites Polymers: PP/MWCNT Investigations for EMI Applications

Ursache

Ciobanu

Scarlatache

et al. 2013

AEF

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Abstract. The paper highlights the most important dielectric features for some nanocomposites polymer matrix based on polypropylene (PP) with insertion of carbon nanotubes multi-walled (MWCNTs). The dielectric characteristics analyzed are the real permittivity and dielectric losses of the sample based on PP with 5% insertion of MWCNTs. The measurements are made in a range of frequency between 1 MHz to 3 GHz. The composite form was also analyzed through computer modeling and simulation and electromagnetic properties for EMC shielding applications are also considered. PP/MWCNTs composite with shielding effectiveness of 15-20 dB was investigated through modeling and simulation at about 5% MWCNTs filling. Shielding mechanism was estimated by calculating the total shielding effectiveness (SE) into absorption and reflection loss. PP/MWCNTs composite indicates a shielding mostly by absorption mechanism; therefore it also can be used in other microwave applications or like a radar absorbing material. The effect of MWCNTs affects the electrical conductivity of the nanocomposite. The proposed material shows some interesting electromagnetic compatibility (EMC) properties and promises better performance using different amounts of MWCNT's.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dielectric and Electromagnetic Behavior of Conductive Nanocomposites Polymers: PP/MWCNT Investigations for EMI Applications

Ursache

Ciobanu

Scarlatache

et al. 2013

AEF

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“…Electromagnetic waves consist of two essential components, a magnetic field H and an electric field E. Assuming a uniform plane wave characteristic of E and H, that varies only along x direction, the Maxwell's curl equations are expressed as [17] dE dx = −jωµH and…”

Section: Electromagnetic Shielding Phenomenonmentioning

confidence: 99%

“…Thus shielding effectiveness is the sum of the three components, absorption (A), reflection (R) and multiple reflections (M) and it can be expressed in logarithmic scale as [5,17] …”

Section: Electromagnetic Shielding Phenomenonmentioning

confidence: 99%

Material Analysis and Application for Radio Frequency Electromagnetic Wave Shielding

Yener

Cerezci

2016

Acta Phys. Pol. A

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Our environment is full of radio frequency (RF) electromagnetic radiation due to rapid progress of wireless communication technologies, which have many applications, such as base stations of mobile communication networks and wireless internet antennas. In the context of Electromagnetic Compatibility (EMC) discipline, the word shield is used to describe any sort of metal sheet or material capable of reflecting, refracting or absorbing electromagnetic radiation (EMR), which is custom manufactured for the target electronic device casing, in a way to intervene any radiation passing to and from the device. Examining of electromagnetic shielding effectiveness (SE) is an important part of not only ensuring electromagnetic compatibility and of protecting electrical and electronic equipment but also protection of human beings against electromagnetic energy exposure as well. In this study, after a brief introduction and review on electromagnetic shielding, material selection and their applications for an indoor environment protection against electromagnetic radiation are explained. Potential electromagnetic shielding values of fabrics found in the market have been analyzed and compared by considering various criteria and requirements. Experimental results show that around 20 dB shielding effectiveness values can be obtained using test fabrics for a typical indoor environment.

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“…It is also obvious that the electromagnetic shielding is vital in military applications. [13][14][15] Shielding effectiveness is the ratio of impinging energy to the residual energy. When an electromagnetic wave passes through a shield, absorption and reflection take place.…”

Section: Electromagnetic-shielding Effectivenessmentioning

confidence: 99%

Electromagnetic-shielding effectiveness and fracture behavior of laminated (Ni–NiAl3) composites

Yener¹,

Yener²,

Zeytin³

2016

Mater. Tehnol.

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In this research Ni-NiAl3 multilayer composites were produced through reactive sintering in an open atmosphere using Ni and Al foils with a 250-μm initial thickness. The sintering was performed at 700°C under 2 MPa of pressure for 6 h. The microstructure and phase characterizations of the samples were performed. The hardness values of samples were determined using the Vickers indentation technique for the intermetallic and metallic regions as 765±60 HV and 90±10 HV, respectively. For the mechanical examinations, a perpendicular load was applied to the composite in order to observe the fracture behavior of the metallic-intermetallic laminate composites. SEM fracture surface analyses indicated that cracks initiated in the intermetallic region, and the crack propagation stopped when it reaches the ductile nickel phase. In addition, shielding-effectiveness measurements were performed. The MIL composite exhibits over 50 dB electromagnetic-shielding effectiveness against a very wide frequency range, from a few GHz to over 18 GHz. Keywords: intermetallics, MIL composites, fracture behavior, electromagnetic interference shielding V raziskavi so bili izdelani Ni-NiAl3 ve~plastni kompoziti z reakcijskim sintranjem na atmosferi in z uporabo Ni-in Al-folij z za~etno debelino 250 μm. Sintranje je bilo 6 h na 700°C, pri tlaku 2 MPa. Na vzorcih je bila izvedena karakterizacija mikrostrukture in faz. Trdota vzorcev je bila dolo~ena po Vickersu, 765±60 HV, za podro~ja intermetalnih faz in 90±10 HV pri osnovi. Za mehanske preiskave je bila uporabljena navpi~na obremenitev, za opazovanje obna{anja kompozita pri lomljenju kovinskih in intermetalnih lamel. SEM-preiskave prelomov so pokazale, da je za~etek razpoke v podro~ju intermetalne faze in da se {irjenje razpoke ustavi, ko pride v duktilno fazo niklja. Izvedene so bile tudi meritve u~inkovitosti za{~ite sevanja. MIL kompozit ka`e u~inkovitost pred elektromagnetnim sevanjem, vi{jo od 50 dB v zelo {irokem obmo~ju frekvenc od nekaj GHz do preko 18 GHz. Klju~ne besede: intermetalne zlitine, MIL kompoziti, obna{anje pri lomu, elektromagnetna interferen~na za{~ita

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Microwave Absorption and EMI Shielding Behavior of Nanocomposites Based on Intrinsically Conducting Polymers, Graphene and Carbon Nanotubes

Cited by 160 publications

References 58 publications

Dielectric and Electromagnetic Behavior of Conductive Nanocomposites Polymers: PP/MWCNT Investigations for EMI Applications

Dielectric and Electromagnetic Behavior of Conductive Nanocomposites Polymers: PP/MWCNT Investigations for EMI Applications

Material Analysis and Application for Radio Frequency Electromagnetic Wave Shielding

Electromagnetic-shielding effectiveness and fracture behavior of laminated (Ni–NiAl3) composites

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