Microwave absorbers based on foamed nanocomposites with graded concentration of carbon nanotubes

Huynen, Isabelle; Bednarz, Łukasz; Thomassin, Jean‐Michel; Pagnoulle, Christine; Jérôme, Robert; Detrembleur, Christophe

doi:10.1109/eumc.2008.4751372

Cited by 22 publications

(15 citation statements)

References 8 publications

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“…It can be seen in Fig. 6 that the predictions obtained with the help of the analytical model matches the measurements, validating (7). The geometrical parameters were = 0 or 5.5 and = 60 ∘ .…”

Section: Em Characterizationsupporting

confidence: 69%

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Electromagnetic absorption of sandwich panel made of glass fiber reinforced polymer and nanocomposite foam filled honeycomb

Bollen

Quiévy

Detrembleur

et al. 2012

International Symposium on Electromagnetic Compatibility - EMC EUROPE

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Sandwich panels were processed and characterized for electromagnetic absorption. The faces are made of glass fiber reinforced epoxy. The core of the panel is made of carbon nanotubes reinforced polymer foam filling a metallic honeycomb. Electromagnetic modeling and experimental characterization of the core showed that the honeycomb, acting as a hexagonal waveguide, improves the absorption properties in the GHz range above the cut-off frequency compared to the composite foam alone. The EM absorption can be tuned by changing the hybrid material properties. The required levels of electrical conductivity are attained owing to the dispersion of low amounts (1-2wt%) of carbon nanotubes inside the polymer matrix. The combination of the foam and a honeycomb architecture contributes to the decrease of the real part of the relative effective permittivity ℜ( , ). Varying the cell shape of the honeycomb changes the frequency range for high absorption. The absorption properties of sandwich panels has been measured from 8 to 40 GHz and succesfully compared to predictions from an analytical model developed for multilayered topologies. Our results show that a careful design of face-sheets allows to preserve and even improve the absorption performances of the hybrid in a dedicated frequency range.

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Section: Em Characterizationsupporting

confidence: 69%

“…However, the relative permittivity is also increased which results in a higher reflectivity. Foaming can reduce the permittivity: CNT filled polymer foams have already been developed by our group [7] [8] [9] [10] [11].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic absorption of sandwich panel made of glass fiber reinforced polymer and nanocomposite foam filled honeycomb

Bollen

Quiévy

Detrembleur

et al. 2012

International Symposium on Electromagnetic Compatibility - EMC EUROPE

Self Cite

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“…designed a gradient multilayer MAM by adding carbon nanotubes (CNTs) into foamed polycaprolactone (PCL) matrix. In the case of the same CNTs content, the reflectivity of the gradient multilayer CNTs/PCL composites was 5 dB lower than that of the single‐layer MAMs with CNTs evenly dispersed in PCL …”

Section: Introductionmentioning

confidence: 95%

“…Methods to reduce the filler concentration have been studied extensively, including modification of magnetic fillers, employment of multiple absorbents, and structural design of MAMs . Owing to the merits of facile processing and low cost, structural design was widely accepted by researchers.…”

Section: Introductionmentioning

confidence: 99%

Microwave absorbing and mechanical properties of alternating multilayer carbonyl iron powder‐poly(vinyl chloride) composites

Gao

et al. 2017

J of Applied Polymer Sci

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Polymeric composites filled with magnetic absorbents have been used extensively as microwave absorbing materials. However, their high filler content obstructed the application. In order to optimize the filler content and further improve the microwave absorbing properties, alternating multilayer carbonyl iron powder (CIP)/poly(vinyl chloride) (PVC) composites were designed and prepared by stacking neat PVC and CIP filled PVC alternately. The microwave absorbing properties were theoretically calculated by the transmission line theory and experimentally measured by the arch method, respectively. The experimental results were consistent with the calculated ones, which demonstrated that the alternating multilayer structure design can significantly improve the microwave absorbing property without increasing the filler content. The consistent results also demonstrated that the reflection loss (R L ) of the multilayer composites was strongly dependent on the layer number and layer arranging sequence. The minimum R L (R L -min) and effective bandwidth were exponentially dependent on the layer number. And the dependencies of the R L -min and effective bandwidth on layer number exhibited a "regularity reversal" phenomenon when different layers faced to the incident wave. The mechanical property test showed that the alternating multilayer composites possessed enhanced tensile strength and elongation at break as the layer number increased.

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“…Nanocomposite materials composed of foamed polymers with embedded carbon nanotubes (CNTs) can be specifically designed to combine a low dielectric constant, because of their significant porosity and a rather high electrical conductivity due to the presence of conductive nanoparticles. The resulting very good shielding effectiveness and low reflectivity of these composites make them especially attractive as microwave absorbers for electromagnetic interferences shielding applications .…”

Section: Introductionmentioning

confidence: 99%

Simple, convenient, and nondestructive electromagnetic characterization technique for composite and multiscale hybrid samples at microwave frequencies

Molenberg

Bernal

Bollen

et al. 2013

Micro & Optical Tech Letters

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A new method is presented to characterize absorbing materials, based on a classical Line‐Line method but more nondestructive and more convenient. This modified Line‐Line technique is used to characterize polymer/carbon nanotubes composite foams. The advantages and limitations of this technique are highlighted and compared to those of the standard method. An advantageous use of the modified Line‐Line method in the particular case of multiscale hybrid materials is also presented and discussed. Finally, some conclusions are drawn. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:504–509, 2014

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Microwave absorbers based on foamed nanocomposites with graded concentration of carbon nanotubes

Cited by 22 publications

References 8 publications

Electromagnetic absorption of sandwich panel made of glass fiber reinforced polymer and nanocomposite foam filled honeycomb

Electromagnetic absorption of sandwich panel made of glass fiber reinforced polymer and nanocomposite foam filled honeycomb

Microwave absorbing and mechanical properties of alternating multilayer carbonyl iron powder‐poly(vinyl chloride) composites

Simple, convenient, and nondestructive electromagnetic characterization technique for composite and multiscale hybrid samples at microwave frequencies

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