Optimization of Multilayer Shields Made of Composite Nanostructured Materials

Micheli, Davide; Apollo, Carmelo; Pastore, Roberto; Barbera, Daniele; Morles, Ramon Bueno; Marchetti, M.; Gradoni, Gabriele; Primiani, Valter Mariani; Moglie, Franco

doi:10.1109/temc.2011.2171688

Cited by 94 publications

(38 citation statements)

References 20 publications

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“…Theoretical calculations show that CNTs act to like insulators, semiconductors or metals depending on their radii and chiralities. Composites with multiwalled carbon nanotubes (MWNTs) embedded into a polymer host have been use to microwave applications, such as antireflection, electromagnetic interference shielding (EMI) or microwave absorber 1,[47][48][49][50][51][52][53][54] . Thus, the objective of this work was to process nanostructured composite materials based on formulations containing different quantities of multiwalled carbon nanotubes in an epoxy resin matrix, aiming to determine the adequate quantity of CNT for processing X-band microwave absorbing nanostructured composite.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured composites based on carbon nanotubes and epoxy resin for use as radar absorbing materials

et al. 2013

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Nanostructured polymer composites have opened up new perspectives for multifunctional materials. In particular, carbon nanotubes (CNTs) present potential applications in order to improve mechanical and electrical performance in composites with aerospace application. The combination of epoxy resin with multiwalled carbon nanotubes results in a new functional material with enhanced electromagnetic properties. The objective of this work was the processing of radar absorbing materials based on formulations containing different quantities of carbon nanotubes in an epoxy resin matrix. To reach this objective the adequate concentration of CNTs in the resin matrix was determined. The processed structures were characterized by scanning electron microscopy, rheology, thermal and reflectivity in the frequency range of 8.2 to 12.4 GHz analyses. The microwave attenuation was up to 99.7%, using only 0.5% (w/w) of CNT, showing that these materials present advantages in performance associated with low additive concentrations.

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Section: Introductionmentioning

confidence: 99%

Nanostructured composites based on carbon nanotubes and epoxy resin for use as radar absorbing materials

et al. 2013

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“…Hence, the composite composed of two dielectric materials (CNT-PANI) and magnetic material (Fe‚ Co) oxide can be used as a high operation and light weight microwave absorber wherein the mechanism of electrical polarization of interface has a positive effect on increasing its absorption ability. C-C bound in carbon nanotubes actually acts as a short circuit‚ therefore causes the high protective and low reflection effect against the incident waves [34].…”

Section: Microwave Absorption Propertiesmentioning

confidence: 99%

Nanosized amorphous (Co‚ Fe) oxide particles decorated PANI–CNT: facile synthesis‚ characterization‚ magnetic‚ electromagnetic properties and their application

et al. 2017

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In this research (PANI/CNT) core/shell nanocomposite were synthesized via in situ chemical oxidative seeding polymerization‚ the results of SEM indicated the structure of synthesized nanocomposite. TEM‚ FTIR‚ UV-Vis‚ XRD analyses of samples showed that this nanocomposite is decorated with (Fe‚ Co) oxide nanoparticles. The VSM test of as prepared and annealed nanocomposite exhibited the saturated magnetization of 1.1 and 3.86 emu/g, respectively; the coercivity values were also − 350 and − 110 Oe, respectively. The reflection loss characteristics of (Fe‚ Co) oxide-Pani-CNT core/shell nanocomposite were also investigated with a vector network analyzer‚ in the 8.2-12.4 GHz range (X band). The maximum absorption increases with enhancement of the dispersed nanoparticles percent in polyurethane matrix from 1 to 10%. The value of the maximum reflection loss in the absorption samples with 1 and 10% of nanoparticles is − 2.14 dB at 9.33 GHz and − 7.32 dB at 11.97 GHZ, respectively.

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“…The database is being reproduced in Table 1 for the sake of completeness. The number of materials in the database is limited to 16; however, database can be extended for any number of materials (experimentally achieved/fictitious) such as the materials database used by the researchers in reference [7,12,30].…”

Section: Examplesmentioning

confidence: 99%

“…The shielding concepts are adopted in EMI applications, while absorption concepts are quite often utilized for radar-absorbing materials (RAMs) [7]. Designing a technical and economical competitive electromagnetic (EM) shield/absorber to meet the electromagnetic compatibility standards or shielding requirements are crucial as over-shielding increases the cost, weight and processing complexity of materials, whereas under-shielding could results in device/equipment failure [8].…”

Section: Introductionmentioning

confidence: 99%

“…The design problem of these EM absorbers mainly lies in the minimization of reflection coefficient in the specific band of frequency and angle of incidence for any transverse electric (T E)/transverse magnetic (T M ) polarization through the selection of the material type, the ordering, and the thickness of each layer from the predefined or recorded database. To tackle this absorber design problem, genetic algorithms (GAs) [9][10][11][12], particle swarm optimization (PSO) [13], self-adaptive differential evolution (SADE) [14], differential evolution (DE) with competitive control-parameter setting technique [15], central force optimization (CFO), gravitational search algorithm (GSA) [16] and winning particle optimization (WPO) [7], have been employed. Among these techniques, Asi and Dib [16] reported that the results of CFO are comparable to SADE and better than PSO and GSA.…”

Section: Introductionmentioning

confidence: 99%

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On the Design and Reliability Analysis of Electromagnetic Absorbers Using Real-Coded Genetic Algorithm and Monte Carlo Simulation

Gargama¹,

Chaturvedi²,

Thakur³

2012

PIER B

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Abstract-In this paper, we propose an approach for designing and quantitatively assessing the performance of the multilayered radarabsorbing structure. In our proposed approach, a five layered radarabsorbing materials design is optimized from the predefined materials database. But to determine the optimal choice of the material and thickness of each layer, a combined binary and real-coded genetic algorithm (GA) is used to handle the integer and real variables involved in such designs. Further, the proposed approach employs the Latin hypercube sampling with Monte Carlo Simulation to carry out the performance based reliability analysis of the design. Absorber synthesized results are compared with the published work using other algorithms. The outcomes of our approach show that the combined GA works quite well, and most prominently the reliability analysis provides the decision maker a means to select among the several design alternatives available before him.

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Optimization of Multilayer Shields Made of Composite Nanostructured Materials

Cited by 94 publications

References 20 publications

Nanostructured composites based on carbon nanotubes and epoxy resin for use as radar absorbing materials

Nanostructured composites based on carbon nanotubes and epoxy resin for use as radar absorbing materials

Nanosized amorphous (Co‚ Fe) oxide particles decorated PANI–CNT: facile synthesis‚ characterization‚ magnetic‚ electromagnetic properties and their application

On the Design and Reliability Analysis of Electromagnetic Absorbers Using Real-Coded Genetic Algorithm and Monte Carlo Simulation

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