Remarkable microwave absorption of GO-SiO2/Fe3O4 via an effective design and optimized composition

Ebrahimi-Tazangi, Fatemeh; Hekmatara, Seyedeh Hoda; Seyed-Yazdi, Jamileh

doi:10.1016/j.jallcom.2020.157213

Cited by 33 publications

(9 citation statements)

References 57 publications

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“…Here, real permittivity (ε′) and real permeability (μ′) represent the storage capacity toward electromagnetic energy and imaginary permittivity (ε″) and imaginary permeability (μ″) represent the storage and dissipation capacity toward electromagnetic energy . Meanwhile, dielectric loss tangent (tan δ ε = ε″/ε′) and magnetic loss tangent (tan δ μ = μ″/μ′) are used to characterize the dielectric and magnetic attenuation capacity, respectively. ,, Clearly, as the frequency increases in the range of 2–18 GHz, both the ε′ and ε″ of different HCF@NC/Co show a similar declining trend (Figure a,b). In detail, the ε′ values of HCF@NC/Co-600, HCF@NC/Co-700, HCF@NC/Co-800, and HCF@NC/Co-900 decreases from 4.0 to 3.1, 6.0 to 4.0, 11.2 to 4.9, and 18.1 to 7.4, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…As for the tan δ μ value, it is much lower than the tan δ ε values, demonstrating the dielectric loss dominant dissipation mechanism. Generally, eddy current loss can be expressed as follows: C 0 = μ″(μ′) −2 f –1 = 2πμ 0 d 2 σ/3, where σ and μ 0 stand for electric conductivity and vacuum dielectric constant, respectively . If the C 0 values remain constant, eddy current loss is considered to be the only magnetic loss mode.…”

Section: Resultsmentioning

confidence: 99%

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Hierarchical HCF@NC/Co Derived from Hollow Loofah Fiber Anchored with Metal–Organic Frameworks for Highly Efficient Microwave Absorption

Guo

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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Hierarchical electromagnetic wave (EMW) absorption materials with a dielectric−magnetic dual-loss mechanism are promising candidates for highly efficient EMW attenuation. Herein, hierarchical dielectric−magnetic composite hollow carbon fiber@nitrogen-doped carbon/Co (HCF@NC/Co) was successfully synthesized via in situ growth of two-dimensional (2D) Co metal−organic framework (MOF) (ZIF-67) nanosheets on the surface of hollow loofah fiber (HLF), followed by a calcination process, where the aggregation of carbonized MOFs was effectively avoided to construct a homogeneous hierarchical onedimensional structure. Based on the advantages of the carbon/Co dielectric−magnetic dual-loss mechanism that results in good impedance matching and multiple polarization loss arising from the extensive heterointerfaces (e.g., HCF-NC/Co, air−carbon, nitrogen−carbon, and Co−carbon interfaces), dipole active sites (e.g., doped N, Co particle, and crystalline defects in graphitic carbon), and hierarchical porous structures, optimal EMW absorption performance of HCF@NC/Co is achieved through regulating the calcination temperature and filler content, where the HCF@NC/Co calcinated at 700 °C exhibits a minimum reflection loss (RL min ) value of −50.14 dB with only 14% filler loading and 2.25 mm thickness, and the maximum effective absorption bandwidth (EAB max ) also reaches 7.36 GHz. Meanwhile, adjustable EAB can also be achieved by optimizing the sample thickness, making it applicable in a wider frequency region. It is expected that our prepared HCF@NC/Co might shed light on designing lightweight and highly efficient EMW MOF-derived EMW absorbing materials.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Hierarchical HCF@NC/Co Derived from Hollow Loofah Fiber Anchored with Metal–Organic Frameworks for Highly Efficient Microwave Absorption

Guo

Wang

et al. 2021

ACS Appl. Mater. Interfaces

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“…Additionally, numerous reports confirm that combining other metal oxides with magnetite enhances the absorption properties of the resulting hybrid nanoparticles. The incorporation of metal oxide hybrids into magnetic materials results in the development of conduction loss mechanisms, residuals, interfacial polarization, electron spin resonance, and a resonant domain wall, all of which contribute directly to improving microwave absorption properties 7 – 9 . Many reports indicate that hybridized magnetite/metallic or magnetite/semiconductor nanoparticles embedded in a conductive polymer or loaded on carbon materials, especially carbon nanotubes, is an effective strategy in producing microwave absorber composites with sound absorption performance 10 – 13 .…”

Section: Introductionmentioning

confidence: 99%

Tuned MWCNT/CuO/Fe3O4/Polyaniline nanocomposites with exceptional microwave attenuation and a broad frequency band

Afzali

Hekmatara

Seyed-Yazdi

et al. 2022

Sci Rep

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In this study, novel quaternary MWCNT/CuO/Fe3O4/PANI nanocomposites were synthesized with three different weight ratios of CuO/Fe3O4/PANI to MWCNT (1:3), (1:4), and (1:5), where all of its components were synthesized separately and then combined in specific weight ratios. CuO/Fe3O4/PANI transmission electron microscopy (TEM) images revealed that most nanoparticles were in a CuO/Fe3O4 hybrid form, with a narrow size distribution uniformly dispersed in a polymer background. The TEM and scanning electron microscopy (SEM) images of the MWCNT/CuO/Fe3O4/PANI nanocomposite revealed that the MWCNT was uniformly coated with CuO/Fe3O4/PANI. All three nanocomposites samples demonstrated superior microwave attenuation performance in terms of reflection loss and absorption bandwidth. The minimum reflection losses for MWCNT/CuO/Fe3O4/PANI nanocomposites (1:3), (1:4), and (1:5) were 45.7, 58.7, and 85.4, 87.4 dB, respectively. The absorption bandwidths (RL ≤ −10 dB) of MWCNT/CuO/Fe3O4/PANI nanocomposites (1:3), (1:4), and (1:5) were 6, 7.6, and 6 GHz, respectively.

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“…It is well known that the high specific surface area, the high aspect ratio and strength of silica nanoparticles make them attractive candidates for polymer reinforcement. 25,26 Recently, various hybrid nanomaterials have attracted widespread attention, driven by the possibility of combining the advantages of different materials, 27 including GO and silica. The OH groups on the surface of GO sheets and SiO 2 nanoparticles can allow the SiO 2 nanoparticles to be grafted onto the surface of GO.…”

Section: Introductionmentioning

confidence: 99%

Preparation and anti‐migration performance of ethylene propylene diene terpolymer composites modified with GO‐SiO₂ hybrid nanomaterials

Zhang

et al. 2022

J of Applied Polymer Sci

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The anti-migration ethylene propylene diene terpolymer (EPDM) inhibitor coating was prepared by using EPDM as a composite matrix and siliconfunctionalized graphene oxide (GO-SiO 2 ) as modifiers to prevent the migration of energetic plasticizers in propellants. The anti-migration performance at different temperatures was analyzed by investigating the diffusion of dioctyl sebacate (DOS) using thermal analysis and immersion tests. After adding 1.0 wt% GO-SiO 2 , the overall performance of the inhibitor coating was the best, and the concentration of DOS that migrated into the inhibitor coating at 30 C was reduced from 45.1% to 38.8% (13.9% decrease). The results confirmed that the introduction of GO-SiO 2 prevented the migration of dioctyl sebacate to the EPDM inhibitor coating. The scanning electron microscopy results showed that GO-SiO 2 was well-dispersed in the inhibitor coating, and the tensile strength increased from 1.80 to 2.11 MPa. Migration kinetics analysis showed that the anti-migration performance was closely related to the crosslink density.

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Remarkable microwave absorption of GO-SiO2/Fe3O4 via an effective design and optimized composition

Cited by 33 publications

References 57 publications

Hierarchical HCF@NC/Co Derived from Hollow Loofah Fiber Anchored with Metal–Organic Frameworks for Highly Efficient Microwave Absorption

Hierarchical HCF@NC/Co Derived from Hollow Loofah Fiber Anchored with Metal–Organic Frameworks for Highly Efficient Microwave Absorption

Tuned MWCNT/CuO/Fe3O4/Polyaniline nanocomposites with exceptional microwave attenuation and a broad frequency band

Preparation and anti‐migration performance of ethylene propylene diene terpolymer composites modified with GO‐SiO₂ hybrid nanomaterials

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Remarkable microwave absorption of GO-SiO2/Fe3O4 via an effective design and optimized composition

Cited by 33 publications

References 57 publications

Hierarchical HCF@NC/Co Derived from Hollow Loofah Fiber Anchored with Metal–Organic Frameworks for Highly Efficient Microwave Absorption

Hierarchical HCF@NC/Co Derived from Hollow Loofah Fiber Anchored with Metal–Organic Frameworks for Highly Efficient Microwave Absorption

Tuned MWCNT/CuO/Fe3O4/Polyaniline nanocomposites with exceptional microwave attenuation and a broad frequency band

Preparation and anti‐migration performance of ethylene propylene diene terpolymer composites modified with GO‐SiO2 hybrid nanomaterials

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Preparation and anti‐migration performance of ethylene propylene diene terpolymer composites modified with GO‐SiO₂ hybrid nanomaterials