Design and preparation of double-layer iron ore tailings cement-based electromagnetic wave absorbing materials containing carbon black and steel fiber

Li, Huawei; Chen, Hengyi; Wei, Muwang; Wang, Rong; Lei, Nengzhong; Wang, Qian

doi:10.1016/j.conbuildmat.2022.129972

Cited by 20 publications

(3 citation statements)

References 52 publications

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“…The attenuation constant is another important index for evaluating the attenuation capability of materials, and it can be calculated by the following formula: α = 2 π italicf italicc × false{ false( μ ″ ε ″ − μ ′ ε ′ false) + [ false( μ ″ ε ″ − μ ′ ε ′ false) 2 + false( ε ′ μ ″ + ε ″ μ ′ false) 2 false] 0.5 } 0.5 where α represents the attenuation constant, ε r = ε′ – jε″ and μ r = μ′ – jμ″ are the relative complex permittivity and relative complex permeability of samples, respectively, f is the frequency, and c represents the speed of light in vacuum . The results in Figure i show that FMGM-1 possesses the highest α values, which can be attributed to the increased surface area resulting from the introduction of the flowerlike Fe 3 O 4 /MoS 2 composites.…”

Section: Resultsmentioning

confidence: 99%

“…where α represents the attenuation constant, ε r = ε′ − jε″ and μ r = μ′ − jμ″ are the relative complex permittivity and relative complex permeability of samples, respectively, f is the frequency, and c represents the speed of light in vacuum. 54 The results in Figure 5i show that FMGM- ity. The introduction of Fe 3 O 4 /MoS 2 leads to a reduction in permittivity, which is expected to optimize impedance matching.…”

Section: Em Wave Absorption Performancementioning

confidence: 87%

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Ultralight Hierarchical Fe₃O₄/MoS₂/rGO/Ti₃C₂T_x MXene Composite Aerogels for High-Efficiency Electromagnetic Wave Absorption

Yan,

Shao,

Tang

et al. 2024

ACS Appl. Mater. Interfaces

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Aerogel-based composites, renowned for their three-dimensional (3D) network architecture, are gaining increasing attention as lightweight electromagnetic (EM) wave absorbers. However, attaining high reflection loss, broad effective absorption bandwidth (EAB), and ultrathin thickness concurrently presents a formidable challenge, owing to the stringent demands for precise structural regulation and incorporation of magnetic/dielectric multicomponents with synergistic loss mechanisms within the 3D networks. In this study, we successfully synthesized a 3D hierarchical porous Fe 3 O 4 /MoS 2 /rGO/Ti 3 C 2 T x MXene (FMGM) composite aerogel via directional freezing and subsequent heat treatment processes. Owing to their ingenious structure and multicomponent design, the FMGM aerogels, featured with abundant heterogeneous interface structure and magnetic/dielectric synergism, show exceptional impedance matching characteristics and diverse EM wave absorption mechanisms. After optimization, the prepared ultralight (6.4 mg cm −3 ) FMGM-2 aerogel exhibits outstanding EM wave absorption performance, achieving a minimal reflection loss of −66.92 dB at a thickness of 3.61 mm and an EAB of 6.08 GHz corresponding to the thickness of 2.3 mm, outperforming most of the previously reported aerogel-based absorbing materials. This research presents an effective strategy for fabricating lightweight, ultrathin, highly efficient, and broad band EM wave absorption materials.

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Section: Resultsmentioning

confidence: 99%

Section: Em Wave Absorption Performancementioning

confidence: 87%

Ultralight Hierarchical Fe₃O₄/MoS₂/rGO/Ti₃C₂T_x MXene Composite Aerogels for High-Efficiency Electromagnetic Wave Absorption

Yan,

Shao,

Tang

et al. 2024

ACS Appl. Mater. Interfaces

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“…In addition, the 3 d, 7 d, and 28 d specimens' mineral compositions were essentially the same, consisting mainly of quartz, calcite, C-S-H, and C-A-S-H, indicating that their mineral phases were produced at 3 d; therefore, the early intensity at 3 d and 7 d was also greater. The small amount of quartz and calcite diffraction peaks comprised the residual minerals in the system that exhibited incomplete reactions [23,38]. Compared with the diffraction peaks at 3 d and 7 d, the quartz and calcite diffraction peaks in the 28 d specimen decreased to different degrees, and a "pack peak" formed by amorphous material appeared in the range of 20-40 • at an angle of 2θ.…”

Section: Xrd Analysis Of Iot-based Cementitious Compositesmentioning

confidence: 98%

The Preparation and Dust Suppression Performance Evaluation of Iron Ore Tailing-Based Cementitious Composites

Nie,

Li,

et al. 2024

Molecules

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In order to comprehensively utilize iron ore tailings (IOTs), the possibility of using IOTs as raw materials for the preparation of cementitious composites (IOTCCs) was investigated, and IOTCC was further applied to mine interface pollution control. The mechanical properties, hydration products, wind erosion resistance, and freeze–thaw (F–T) cycle resistance of IOTCCs were evaluated rigorously. The activity index of iron tailings increased from 42% to 78% after grinding for 20 s. The IOTCC was prepared by blending 86% IOT, 10% ground granulated blast-furnace slag (GGBS), and 4% cement clinker. Meanwhile, the hydration products mainly comprised ettringite, calcium hydroxide, and C-S-H gel, and they were characterized via XRD, IR, and SEM. It was observed that ettringite and C-S-H gel were principally responsible for the strength development of IOTCC mortars with an increase in curing time. The results show that the kaolinite of the tailings was decomposed largely after mechanical activation, which promoted the cementitious property of IOT.

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Construction of multilayer carbon magnetic heterostructures on the surface of carbon fibers to improve the absorption performance

Jia,

He,

Sun

et al. 2024

Polymer Composites

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This study utilizes the strong complexation effect of polydopamine on metal ions and constructs multilayer carbon magnetic heterostructures on the surface of carbon fibers through the in situ reduction method, thereby obtaining a new type of multilayer carbon‐based composite absorbing material. The absorption properties at different layers were analyzed and compared through various characterization methods. Finally, the double‐layer structure demonstrated outstanding electromagnetic wave absorption characteristics, exhibiting a wide effective absorption bandwidth of 7.24 GHz and robust absorption of −44.48 dB, all within a mere thickness of 3.5 mm. Therefore, excellent market prospects for this material are anticipated.Highlights A multilayer carbon magnetic heterostructure absorbing material was constructed on micrometer‐scale carbon fibers. The test results show that a wide effective absorbing bandwidth of 7.24 GHz and a minimum reflection loss of −44.48 dB are obtained when the composite thickness is 3.5 mm. The prepared multilayer absorbing composites can adapt to a variety of application scenarios and have excellent application prospects in the industry. The self‐polymerization of dopamine and complexation of metal ions were used to construct multilayer absorbing materials, and the dielectric loss and magnetic loss capacity of the carbon fibers improved.

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Design and preparation of double-layer iron ore tailings cement-based electromagnetic wave absorbing materials containing carbon black and steel fiber

Cited by 20 publications

References 52 publications

Ultralight Hierarchical Fe₃O₄/MoS₂/rGO/Ti₃C₂T_x MXene Composite Aerogels for High-Efficiency Electromagnetic Wave Absorption

Ultralight Hierarchical Fe₃O₄/MoS₂/rGO/Ti₃C₂T_x MXene Composite Aerogels for High-Efficiency Electromagnetic Wave Absorption

The Preparation and Dust Suppression Performance Evaluation of Iron Ore Tailing-Based Cementitious Composites

Construction of multilayer carbon magnetic heterostructures on the surface of carbon fibers to improve the absorption performance

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Design and preparation of double-layer iron ore tailings cement-based electromagnetic wave absorbing materials containing carbon black and steel fiber

Cited by 20 publications

References 52 publications

Ultralight Hierarchical Fe3O4/MoS2/rGO/Ti3C2Tx MXene Composite Aerogels for High-Efficiency Electromagnetic Wave Absorption

Ultralight Hierarchical Fe3O4/MoS2/rGO/Ti3C2Tx MXene Composite Aerogels for High-Efficiency Electromagnetic Wave Absorption

The Preparation and Dust Suppression Performance Evaluation of Iron Ore Tailing-Based Cementitious Composites

Construction of multilayer carbon magnetic heterostructures on the surface of carbon fibers to improve the absorption performance

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Product

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Ultralight Hierarchical Fe₃O₄/MoS₂/rGO/Ti₃C₂T_x MXene Composite Aerogels for High-Efficiency Electromagnetic Wave Absorption

Ultralight Hierarchical Fe₃O₄/MoS₂/rGO/Ti₃C₂T_x MXene Composite Aerogels for High-Efficiency Electromagnetic Wave Absorption