Electromagnetic properties of carbon nanotube reinforced concrete composites for frequency selective shielding structures

Micheli, Davide; Vricella, A.; Pastore, Roberto; Delfini, Andrea; Morles, Ramon Bueno; Marchetti, M.; Santoni, Fábio; Bastianelli, Luca; Moglie, Franco; Primiani, Valter Mariani; Corinaldesi, Valeria; Mazzoli, Alida; Donnini, Jacopo

doi:10.1016/j.conbuildmat.2016.11.078

Cited by 69 publications

(18 citation statements)

References 41 publications

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“…The thickness of the RGO film can be tuned by changing the volume of RGO suspension during filtration. This lamellar structure contributes to the absorption of electromagnetic waves that are emit in the vertical direction [ 22 , 23 , 24 ]. The ultrathin films are flexible as evident from Figure 3 c, where they are shown to be bent and rolled around a pen.…”

Section: Resultsmentioning

confidence: 99%

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Broadband Microwave Absorbing Composites with a Multi-Scale Layered Structure Based on Reduced Graphene Oxide Film as the Frequency Selective Surface

Chen

Zhou

et al. 2018

Materials

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A broadband microwave absorbing composite with a multi-scale layered structure is proposed, in which a reduced graphene oxide (RGO) film sandwiched between two layers of epoxy glass fiber laminates serves as the frequency selective surface (FSS). RGO films with the desired electrical properties were synthesized directly by hydrothermal reaction, vacuum filtration, and heat treatment without subsequent processing. With the novel layer-by-layer structure ranging from micro to macro scale, the optimized composite exhibits excellent microwave absorption performance with a total thickness of 3.2 mm. Its reflection coefficient (RC) is less than −10 dB in the entire X and Ku band, reaching a minimum value of −32 dB at 10.2 GHz and an average RC of −22.8 dB from 8 to 18 GHz. Enhanced microwave absorption of the composites is achieved through the optimization of layer thickness in the sandwich structure to promote destructive interference. Improved impedance matching by the introduction of FSS along with the polarization and conduction loss of layered graphene films also contribute to the increased absorption.

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Section: Resultsmentioning

confidence: 99%

“…There is a similar tendency between the simulated and experimental results. Although it is difficult to eliminate the difference between the two results, it can be reduced by optimizing algorithm and refining database as the cases in other studies [ 21 , 22 , 23 ].…”

Section: Resultsmentioning

confidence: 99%

Broadband Microwave Absorbing Composites with a Multi-Scale Layered Structure Based on Reduced Graphene Oxide Film as the Frequency Selective Surface

Chen

Zhou

et al. 2018

Materials

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“…The incorporation of carbonaceous materials (carbon fibres, carbon black, and carbon nanomaterials) into cement-based materials has achieved a wide range of novel functionalities. Apart from self-sensing capabilities (14)(15)(16)(17)(18), such an approach has resulted in cementitious materials with other properties, such as electromagnetic shielding (19,20), self-heating (17,(21)(22)(23), cathodic protection of structures (24,25), and chloride removal (25,26).…”

Section: Introductionmentioning

confidence: 99%

Development of conductive cementitious materials using recycled carbon fibres

Faneca¹,

Segura

Torrents

et al. 2018

Cement and Concrete Composites

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Conductive cementitious materials have gained immense attention in recent years owing to the possibility of achieving multifunctional materials. The usual approach has been to incorporate carbonaceous nanomaterials and/or virgin carbon fibres into cementitious matrices. This paper presents the first research devoted to the development of conductive cementitious materials using recycled carbon fibres (rCFs). Four different types of PANbased rCFs were studied, by varying the aspect ratio and supplying characteristics, in two concrete dosages: conventional and ultra-high-performance concrete mixes. Two mixing methods-dry and wet-commonly used to fabricate fibre-reinforced concrete were considered. The results obtained in our result have shown that wet mix method achieves better

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“…Thus, preparing PCs with superior EMI SE at low nanofiller loading remains a mission of shouldering heavy responsibilities. It is well known that regulating the structure of PCs has a remarkable influence on the electrical conductivity, which is directly related to EMI SE [24,25,26,27,28,29]. Recently, a large number of researchers have proven that PCs with layer-structured possessed superior EMI SE than conventional PCs at low filler content [20,26,30,31,32,33,34,35].…”

Section: Introductionmentioning

confidence: 99%

Layer-Structured Design and Fabrication of Cyanate Ester Nanocomposites for Excellent Electromagnetic Shielding with Absorption-Dominated Characteristic

Ren

Guo

et al. 2018

Polymers

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In this work, we propose novel layer-structured polymer composites (PCs) for manipulating the electromagnetic (EM) wave transport, which holds unique electromagnetic interference (EMI) shielding features. The as-prepared PCs with a multilayered structure exhibits significant improvement in overall EMI shielding effectiveness (EMI SE) by adjusting the contents and distribution of electrical and magnetic loss fillers. The layer-structured PCs with low nanofiller content (5 wt % graphene nanosheets (GNSs) and 15 wt % Fe3O4) and a thickness of only 2 mm exhibited ultrahigh electrical conductivity and excellent EMI SE, reaching up to 2000 S/m and 45.7 dB in the X-band, respectively. The increased EMI SE of the layer-structured PCs was mainly based on the improved absorption rather than the reflection of electromagnetic waves, which was attributed to the “absorb-reflect-reabsorb” process for the incident electromagnetic waves. This work may provide a simple and effective approach to achieve new EMI shielding materials, especially for absorption-dominated EMI shielding.

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Electromagnetic properties of carbon nanotube reinforced concrete composites for frequency selective shielding structures

Cited by 69 publications

References 41 publications

Broadband Microwave Absorbing Composites with a Multi-Scale Layered Structure Based on Reduced Graphene Oxide Film as the Frequency Selective Surface

Broadband Microwave Absorbing Composites with a Multi-Scale Layered Structure Based on Reduced Graphene Oxide Film as the Frequency Selective Surface

Development of conductive cementitious materials using recycled carbon fibres

Layer-Structured Design and Fabrication of Cyanate Ester Nanocomposites for Excellent Electromagnetic Shielding with Absorption-Dominated Characteristic

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