Electromagnetic characterization of advanced nanostructured materials and multilayer design optimization for metrological and low radar observability applications

Micheli, Davide; Pastore, Roberto; Delfini, Andrea; Giusti, A M; Vricella, A.; Santoni, Fábio; Marchetti, M.; Толочко, О. В.; Vasilyeva, E. S.

doi:10.1016/j.actaastro.2017.01.044

Cited by 39 publications

(18 citation statements)

References 26 publications

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“…This occurrence could be associated with the conversion of magnetic to electric energy [12]. The µ and µ" were observed to decay towards unity and zero, respectively, as the frequency approaches 12 GHz and beyond, such behavior can be attributed to zero magnetic properties at high frequency [32]. The magnitude of the losses or energy dissipation can be estimated by evaluating the dielectric and magnetic loss tangents (tanδε and tanδµ).…”

Section: Em Wave Absorption Propertiesmentioning

confidence: 99%

Investigation of the Broadband Microwave Absorption of Citric Acid Coated Fe3O4/PVDF Composite Using Finite Element Method

et al. 2019

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Magnetite (Fe 3 O 4 ) have been thoroughly investigated as microwave absorbing material due to its excellent electromagnetic properties (permittivity and permeability) and favorable saturation magnetization. However, large density and impedance mismatch are some of the limiting factors that hinder its microwave absorption performance (MAP). Herein, Fe 3 O 4 nanoparticles prepared by facile co-precipitation method have been coated with citric acid and embedded in a polyvinylidene fluoride (PVDF) matrix. The coated Fe 3 O 4 nanoparticles were characterized by X-ray diffraction spectrometer (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), and vibrating sample magnetometer (VSM). COMSOL Multiphysics based on the finite element method was used to simulate the rectangular waveguide at X-band and Ku-band frequency range in three-dimensional geometry. The citric acid coated Fe 3 O 4 /PVDF composite with 40 wt.% filler loading displayed good microwave absorption ability over the studied frequency range (8.2-18 GHz). A minimum reflection loss of −47.3 dB occurs at 17.9 GHz with 2.5 mm absorber thickness. The composite of citric acid coated Fe 3 O 4 and PVDF was thus verified as a potential absorptive material with improved MAP. These enhanced absorption coefficients can be ascribed to favorable impedance match and moderate attenuation. Appl. Sci. 2019, 9, 3877 2 of 17 attracted much interest in the field of EM wave absorption. However, Fe 3 O 4 as an absorptive material have some limitations such as the rapid decrease in permeability value at microwave frequency, large density, ease of oxidation and mismatch of impedance which impedes its performance as an ideal MAM [6,7].Recently, several research efforts have been geared towards improving the microwave absorption performance (MAP) of Fe 3 O 4 . For example, Mingxu et al. [8] fabricated hollow Fe 3 O 4 nanoparticles via solvothermal route, with the aim of reducing its density while retaining good magnetic properties for efficient MAP. They established improved EM wave absorption with increasing particle size and change in morphology. Maximum EM absorption with RL value of −55.14 dB at 11.76 GHz was achieved with an absorber thickness of 2.07 mm. Guiquig et al. [9] synthesized nano-Fe 3 O 4 by an innovative wet chemical route, employing hydrazine hydrate as anti-oxidation agent. The synthesized Fe 3 O 4 nanoparticle of average diameter of 77 nm possessed high magnetization saturation and coercivity value of 72.36 emu/g and 95 Oe, respectively. The minimum RL value of −21.2 dB was achieved with 6 mm thickness. Similarly, optimization of the MAP of Fe 3 O 4 via design and fabrication of hierarchical nanostructure have also been explored. Chaomie et al. [10] exploit one-step and template-free synthesis method to prepare octahedral Fe 3 O 4 nanostructure by direct decomposition of an iron organic compound with molten salt. The sample annealed at 800 • C displayed maximum EM absorption of −23.67 dB at 15.24 GHz at a ...

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Section: Em Wave Absorption Propertiesmentioning

confidence: 99%

Investigation of the Broadband Microwave Absorption of Citric Acid Coated Fe3O4/PVDF Composite Using Finite Element Method

et al. 2019

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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%

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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“…Electromagnetic interference (EMI) and electromagnetic compatibility (EMC) are two major outbreak problems, which observed with microwave radiation in modern instruments such as satellite communications systems, mobile phones, automated teller machines (ATM), wireless systems and local area networks (LANs) . Today, protection of electronic equipment with microwave absorbing material against EMI and EMC is an inescapable requirement.…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite based on epoxy and MWCNTs modified with NiFe₂O₄ nanoparticles as efficient microwave absorbing material

Hosseini

Mahdavi

2018

Applied Organom Chemis

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In order to make a microwave absorbent material with good dielectric and magnetic properties, well dispersed microwave absorbing hybrid epoxy polymer composites containing nickel doped Fe 3 O 4 nanocrystals coated on carbon nanotubes (NiFe 2 O 4 -MWCNTs/epoxy) were synthesized by the combined precipitation-hydrothermal method in 1-30 wt.% of nanoparticles. Nickel possess well interaction with microwave radiation and represents fine electromagnetic interference (EMI) shielding and by dopping it into ferrite spinel structures, does not show any tendency to oxidation. Well-dispersed NiFe 2 O 4 -MWCNTs/epoxy nanocomposite prepared by new in-situ polymerization method. First, NiFe 2 O 4 -MWCNT nanoparticles ultrasonicated in acetone and after mixing with epoxy resin ultrasonicated again. Finally, hardner added to the composite and tuned temperature for evaporating solvent. X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) confirmed the synthesizing NiFe 2 O 4 nanoparticles. Saturation magnetization value of NiFe 2 O 4 -MWCNTs is about 29 emu/g with very low remanence and coercivity content, which revealed that the NiFe 2 O 4 -MWCNTs is ferromagnetic nanocrystal. Transmission electron microscopy (TEM) used to characterize the distribution of NiFe 2 O 4 nanocrystals on the surface of MWCNTs. The TEM images show that NiFe 2 O 4 nanocrystals have a mean size of 12 nm, and completely coated on the exterior surface of MWCNTs. The obtained results of reflection loss revealed that the maximum values of reflection loss of the NiFe 2 O 4 -MWCNTs/epoxy increase by enhancing the content of nanoparticles until 10 wt.% and decreases in 30 wt.%.

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Electromagnetic characterization of advanced nanostructured materials and multilayer design optimization for metrological and low radar observability applications

Cited by 39 publications

References 26 publications

Investigation of the Broadband Microwave Absorption of Citric Acid Coated Fe3O4/PVDF Composite Using Finite Element Method

Investigation of the Broadband Microwave Absorption of Citric Acid Coated Fe3O4/PVDF Composite Using Finite Element Method

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

Nanocomposite based on epoxy and MWCNTs modified with NiFe₂O₄ nanoparticles as efficient microwave absorbing material

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Electromagnetic characterization of advanced nanostructured materials and multilayer design optimization for metrological and low radar observability applications

Cited by 39 publications

References 26 publications

Investigation of the Broadband Microwave Absorption of Citric Acid Coated Fe3O4/PVDF Composite Using Finite Element Method

Investigation of the Broadband Microwave Absorption of Citric Acid Coated Fe3O4/PVDF Composite Using Finite Element Method

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

Nanocomposite based on epoxy and MWCNTs modified with NiFe2O4 nanoparticles as efficient microwave absorbing material

Contact Info

Product

Resources

About

Nanocomposite based on epoxy and MWCNTs modified with NiFe₂O₄ nanoparticles as efficient microwave absorbing material