Constructing 3D cross-connected networks in spongy MgO/Ni/MWCNT composites to synchronously boost microwave absorption and thermal conductivity

You, Feifei; Chen, Yangbing; Ying, Meiwan; Zhu, Chenxu; Tong, Guoxiu; Wang, Xiaojuan; Wu, Wenhua

doi:10.1016/j.apsusc.2023.157852

Cited by 16 publications

(2 citation statements)

References 63 publications

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“…Referring to the transmission line theory, the relevant formulas are given below: , R L 0.25em ( dB ) = 20 0.25em lg | false( Z in − Z 0 false) / false( Z in + Z 0 false) | Z in = Z 0 false( μ r / ε r false) 1 / 2 tan normalh [ j false( 2 π italicfd / c false) ( μ normalr ε normalr ) 1 / 2 ] where Z 0 denotes the impedance of free space, whereas Z in represents the input impedance of an absorber; f and c denote the electromagnetic wave frequency and the light velocity under vacuum conditions, respectively; and d refers to the thickness of the absorber. In addition, the complex permittivity and permeability are represented by μ r and ε r , respectively. , …”

Section: Results and Discussionmentioning

confidence: 99%

“…In most of the magnetic/carbon composite materials, the synthesis and introduction of magnetic components are usually achieved by a cumbersome and time-consuming chemical process. , For the large-scale production and application of absorbers in the future, low-cost raw materials and production costs also need to be seriously considered. To achieve this goal, our research group previously attempted to recycle carbonaceous solid waste, such as fly ash, coal gangue, and coal gasification residue to replace expensive carbon materials in the construction of magnetic/C composite absorbers.…”

Section: Introductionmentioning

confidence: 99%

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Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Xue,

Su,

Jia

et al. 2024

ACS Appl. Electron. Mater.

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To achieve the high-value utilization of solid waste red mud and the low-cost preparation of efficient microwave absorbers, we recycled red mud (RM) and coal (C) to economically synthesize Fe x O y /C-based microwave absorbers (named RMCs) via a one-pot method and carbothermal reduction technology. It was found that the magnetic species and carbon crystallinity are sensitive to the carbothermal temperature. Interestingly, the microwave absorption performances of RMC composites display strong inclusiveness to the variable magnetic components with temperature. Benefiting from the suitable magnetic species and graphitization degree of carbon, excellent microwave absorption properties are achieved in the RMC composites. For RMC-700 composites, all of the minimum reflection loss (RL min ) values are less than −30 dB when the coating thickness is above 1.5 mm, and its maximum efficient absorption bandwidth (EAB max ) covers five-sixths of the Ku band (5 GHz). For RMC-900 samples with a coating thickness of 1.5 mm, the RL min value could reach −25 dB with a corresponding EAB of 4.16 GHz. An RL min value of −34.6 dB and an EAB max of 4.08 GHz are also obtained in RMC-1000 composites. The above excellent properties are mainly benefited by the strong dielectric loss, which is derived from Fe and its oxide particles as well as graphitized carbon. Moreover, multiple interface polarization and dipole polarization loss provide a guarantee for the powerful attenuation capability of the RMC composite. Impedance matching is also effectively regulated by the changeable magnetic constituents. More importantly, this work provides a direction for the application of recycled red mud, further reducing the environmental pollution caused by its stacking, and is expected to make certain contributions toward protection against electromagnetic radiation.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Xue,

Su,

Jia

et al. 2024

ACS Appl. Electron. Mater.

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Integration of Heterogeneous Interfaces and Multi‐Dimensional Encapsulation Structure in Fe₂N@CNTs Enabling Highly Efficient Thermal Management and Microwave Absorption

Wang,

Miao,

Gao

et al. 2024

Adv Funct Materials

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The opposing effects of interface effect on phonon heat conduction and microwave absorption hinder the integration of thermal conduction with microwave absorption. Reconciling this contradiction by rationally optimizing the material structure remains a challenge. Herein, Fe2N@CNTs with heterogeneous interfaces and multi‐dimensional encapsulated structures are fabricated through in situ chemical vapor deposition (CVD) to realize excellent thermal conductivity and microwave absorption. When the mass fraction of active material is 40 wt.%, the thermal conductivity (λ//) of Fe2N@CNTs composite films is 6.69 W m−1 K−1. The minimum reflection loss (RLmin) is up to −54.55 dB at a thickness of 3.43 mm, and the effective absorption bandwidth (EAB) is 5.52 GHz at 1.82 mm. The well‐designed Fe2N@CNTs is an ideal model for gaining insight into electron transportation and phonon multi‐dimensional heat transport. Heterogeneous interface improves the dielectric loss and facilitates microwave and phonon absorption and conversion. The multi‐dimensional encapsulation structure increases the electron transport path and phonon heat transport paths making axial and radial co‐transfer possible. The multi‐dimensional encapsulation structure demonstrates extremely high microwave absorption and thermal management capabilities, which open up new possibilities for multifunctional applications in host materials with internal hollows.

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Double-layered chitosan aerogel/MXene film composites with asymmetric structure for absorption-dominated electromagnetic interference shielding and solar-driven interfacial evaporation

Zhou,

Zhang,

Zhang

2024

Adv Compos Hybrid Mater

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Constructing 3D cross-connected networks in spongy MgO/Ni/MWCNT composites to synchronously boost microwave absorption and thermal conductivity

Cited by 16 publications

References 63 publications

Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Integration of Heterogeneous Interfaces and Multi‐Dimensional Encapsulation Structure in Fe₂N@CNTs Enabling Highly Efficient Thermal Management and Microwave Absorption

Double-layered chitosan aerogel/MXene film composites with asymmetric structure for absorption-dominated electromagnetic interference shielding and solar-driven interfacial evaporation

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Constructing 3D cross-connected networks in spongy MgO/Ni/MWCNT composites to synchronously boost microwave absorption and thermal conductivity

Cited by 16 publications

References 63 publications

Facile Synthesis of FexOy/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Facile Synthesis of FexOy/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Integration of Heterogeneous Interfaces and Multi‐Dimensional Encapsulation Structure in Fe2N@CNTs Enabling Highly Efficient Thermal Management and Microwave Absorption

Double-layered chitosan aerogel/MXene film composites with asymmetric structure for absorption-dominated electromagnetic interference shielding and solar-driven interfacial evaporation

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Product

Resources

About

Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Facile Synthesis of Fe_xO_y/C-Based Microwave Absorption Composites under Elevated-Temperature Heat Treatment for the High-Value Utilization of Red Mud

Integration of Heterogeneous Interfaces and Multi‐Dimensional Encapsulation Structure in Fe₂N@CNTs Enabling Highly Efficient Thermal Management and Microwave Absorption