Enhanced of Electrical Properties and Shielding Efficiency of Hybrid Composite with Temperature

Merizgui, Tahar; Hadjadj, Abdechafik; Kious, Mecheri; Gaoui, Bachir

doi:10.18280/rcma.290307

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…They also explicated that when the incoming microwave temperature increases the conductivity decreases due to poor polarization, which gives lower conductivity factor. Similar work also reported by Ramesh et al [7] in natural rubber, which contain MWCNTs and Fe3O4 particles. The authors confirm the magnetization of 15vol.% of compound particles reinforced natural rubber composite gives 587E -6 .…”

Section: Introductionsupporting

confidence: 89%

“…All electronic tools that distribute or transmit electrical energy create electromagnetic waves, which have harmful impacts on human health, surrounding environment, and device performance [1]. The electromagnetic wave created by them gradually interfere with each other, as well are called the electromagnetic interference (EMI) [2][3][4][5][6][7][8]. In fact, the composite material that designed for the electromagnetic compatibility (EMC) applications contain conductive fibres (High electrical conductivity σ>>0) embedded in a dielectric medium (electrical conductivity σ=0) [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Impact of Temperature Variation on the Electromagnetic Shielding Behavior of Multilayer Shield for EMC Applications

Merizgui¹,

Hadjadj²,

Kious³

et al. 2019

RCMA

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This paper attempts to disclose how temperature variation affects the electromagnetic shielding of a multilayer composite made of copper (Cu) fibers surrounded by silicon (Si). The model of the composite was fabricated by physical vapor deposition method, and tested with the temperature rising from room temperature (RT), 50º C, 85º C to 110º C. Under these temperatures, several electromagnetic shielding parameters of the composite were measured in various operating microwave frequencies (E, F, I and J bands). Among them, dielectric permittivity was acquired by LCR tester, magnetic permeability was measured by vibrating sample magnetometer (VSM), and the electromagnetic (EM) wave attenuation was recorded by typical microwave test bench. The results show that the composite had an EMI shielding of 20dB at 85º and 100dB at the RT; the reflection loss of the composite (volume fraction: 0.32) was also 100dB at the RT. Thus, the temperature rise suppresses the reflection loss; the composite has better electromagnetic shielding effect at the RT than at elevated temperatures; the volume faction enhances the wave attenuation of the composite. The results provide a good reference for the design of stable electromagnetic shielding materials at elevated temperatures.

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Section: Introductionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Impact of Temperature Variation on the Electromagnetic Shielding Behavior of Multilayer Shield for EMC Applications

Merizgui¹,

Hadjadj²,

Kious³

et al. 2019

RCMA

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“…This phenomenon is the cause of very high amplitude microwave produces more crest and trough within skin depth and loss in their energy level. [ 37 ] Thus, larger attenuation is observed at larger frequencies.…”

Section: Resultsmentioning

confidence: 99%

Role of cobalt nanowire and graphene nanoplatelet on microwave shielding behavior of natural rubber composite in high frequency bands

Jeevakumari¹,

Indhumathi

Prakash³

2020

Polymer Composites

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Highly flexible microwave shielding E (2-3 GHz), F (3-4 GHz), I (8-12 GHz) and J (12-16 GHz) natural rubber composites for antenna application were prepared and characterized. The main objective of this current research is to develop a flexible microwave shielding material to reduce electromagnetic inference (EMI) effect. Graphene nanoplatelet and cobalt nanowire was selected for improving electric and magnetic losses. The flexible rubber composite was prepared using two-roll mill process and cured at an temperature of 150 ο C. The mechanical, dielectric, magnetic, and microwave shielding properties were tested in accordance to ASTM standards. Highest tensile strength of 30 MPa was obtained for composite made of 6phr (parts per hundred rubber) of graphene nanoplatelet and cobalt nanowire (NR 4). Dielectric results show that the composite consists of graphene nanoplatelet and cobalt nanowire of 6phr gives highest dielectric constant of 7.2. The hysteresis analysis shows a highest magnetization of 940 emu, remanence of 610 emu and coercivity of 2750G for NR 4 composite. Similarly, the maximum microwave attenuation of 38.1 dB at 18 GHz (J band) was achieved in NR 4 composite. This high microwave shielding flexible composite material could be used as EMI filter and electromagnetic absorber in antennae applications where EMI need to be lesser.

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“…Generally, the attenuation of external EMW can be divided in three mechanisms including the reflection, absorption mechanism of energy inside the shield, [10] and multiple internal reflections of waves. [ 11–14 ]…”

Section: Introductionmentioning

confidence: 99%

“…SE E and SE M are described by the following equations [ 11–15 ] :

{SE}_{E} = 20 \log_{10} \frac{E_{normali}}{E_{normalt}}

{SE}_{M} = 20 \log_{10} \frac{H_{normali}}{H_{normalt}}

where E i and H i are the electric and magnetic field that are incident to the hybrid polymer composite, and E t and H t are the electric and magnetic field that are transmitted by the mixture.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic shielding effectiveness improvement with high temperature in far‐field behavior multiwall carbon nanotube/iron (III) particles addition in composites

et al. 2020

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The hybrid polymer composite (HPMC) are increasingly used in the most shielding applications in the far field region, but the main problem is these HPMC should be having a good shielding efficiency and works at high temperature. The purpose of this research study was to prepare a high stable microwave shielding hybrid polymer composite for incremental temperature implementations with surface modified MWCNTs and Fe2O3 filled contents. In this paper, the kenaf fiber, Iron (III) oxide and MWCNTs particles were surface‐treated by APTMS for effective dispersion and adhesion on epoxy matrix medium. The morphology of the obtained shields was investigated by scanning electron microscopy. Thus, additions of MWCNTs and Iron (III) oxide particles increase the magnetic permeability and electrical permittivity of epoxy polymer matrix at high temperature (25°C‐100°C‐200°C). The kenaf fibers increase the mechanical properties such as the flexural, tensile. The principal advantages of these compositions are its low cost and its higher electrical conductivity which make it a suitable material as shielding material against electromagnetic field at high temperature. For electromagnetic compatibility in the far‐field regions, the adequate SE in the frequency range of 2 to 18 GHz of the epoxy polymer matrix‐kenaf fiber conducting composites was obtained by adding the MWCNT and Fe2O3 particles.

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Enhanced of Electrical Properties and Shielding Efficiency of Hybrid Composite with Temperature

Cited by 7 publications

References 12 publications

Impact of Temperature Variation on the Electromagnetic Shielding Behavior of Multilayer Shield for EMC Applications

Impact of Temperature Variation on the Electromagnetic Shielding Behavior of Multilayer Shield for EMC Applications

Role of cobalt nanowire and graphene nanoplatelet on microwave shielding behavior of natural rubber composite in high frequency bands

Electromagnetic shielding effectiveness improvement with high temperature in far‐field behavior multiwall carbon nanotube/iron (III) particles addition in composites

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