3D core-shell Fe3O4@SiO2@MoS2 composites with enhanced microwave absorption performance

Liao, Jun; Qiu, Jun-Feng; Wang, Guohui; Du, Rongxiao; Tsidaeva, Natalia; Wang, Wei

doi:10.1016/j.jcis.2021.07.032

Cited by 89 publications

(26 citation statements)

References 62 publications

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“…19-0629). 27,28 No other diffraction peaks are found, indicating the high purity of the as-prepared Fe 3 O 4 . 29 Similar to the XRD pattern of Fe 3 O 4 , the XRD pattern of Fe 3 O 4 @ SiO 2 shows the characteristic peaks of Fe 3 O 4 only, which reveals a homogeneous dispersion of the amorphous SiO 2 shell and no other characteristic peaks are found.…”

Section: Resultsmentioning

confidence: 94%

Preparation of magnetic silica supported Brønsted acidic ionic liquids for the depolymerization of lignin to aromatic monomers

Cui

Wang

et al. 2022

New J. Chem.

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Section: Resultsmentioning

confidence: 94%

Preparation of magnetic silica supported Brønsted acidic ionic liquids for the depolymerization of lignin to aromatic monomers

Cui

Wang

et al. 2022

New J. Chem.

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“…Figure S13a–c shows Cole–Cole semicircles for three samples; all the curves are composed of multiple irregular semicircles and a straight line. These semicircles represent multiple polarization relaxations, including interfacial polarization and dipole polarization, and the straight line is related to conduction loss . Also, with the introduction of a hollow structure and CNT, the curve gradually becomes flat, indicating that conduction loss is gradually strengthened.…”

Section: Resultsmentioning

confidence: 99%

“…These semicircles represent multiple polarization relaxations, including interfacial polarization and dipole polarization, and the straight line is related to conduction loss. 65 Also, with the introduction of a hollow structure and CNT, the curve gradually becomes flat, indicating that conduction loss is gradually strengthened. Also, the diameter of Cole−Cole semicircles of CoNi/CNT/HCNs is large and shows the strongest polarization relaxation.…”

Section: Resultsmentioning

confidence: 99%

Decorating CoNi Alloy-Encapsulated Carbon Nanotube Hollow Nanocages to Enable Dielectric Loss for Highly Efficient Microwave Absorption

Huang

Wang

et al. 2022

ACS Appl. Nano Mater.

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Metal–organic framework-derived carbon materials have attracted considerable attention as efficient electromagnetic microwave absorption (EMA) materials due to their tunable structure and components. However, their poor electrical conductivity and restricted pore volume lead to poor impedance matching and high filler content, limiting further applications. Herein, an efficient strategy is proposed for designing hollow CoNi/carbon nanotube (CNT)/hollow carbon nanocage (HCN) composites through Ni2+ etching and subsequent thermal catalysis treatment. The CoNi alloy nanoparticle-encapsulated CNTs are decorated on the surface of HCNs and unique CoNi alloy nanoparticles on the top of the CNT. The introduction of CNTs not only enhances the attenuation capacity of the electromagnetic microwave (EMW) but also effectively maintains the hollow structure of the matrix to optimize impedance matching characteristics and construct abundant heterogeneous interfaces with the CoNi alloy, enhancing the interfacial polarization loss. Benefitting from the hollow structure and a large number of micropores which facilitate impedance matching, the strong conduction loss, and enhanced interfacial polarization loss of the CNT, the dielectric loss of CoNi/CNT/HCNs is effectively improved. CoNi/CNT/HCNs exhibit excellent EMA performance with a minimum reflection loss of −59.5 dB and achieve a maximum effective absorption bandwidth of 7.1 GHz at 1.8 mm. This study not only proposes an effective strategy to achieve an efficient EMW absorber with a strong attenuation and broadband but also provides insights into how to maintain the hollow structure of the substrate.

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“…[ 21 ] However, MW catalytic capability about ferromagnetic MoS 2 composites in addition to electrocatalytic, photocatalytic, or Photo‐Fenton like catalyst performance has seldom been explored. [ 22–24 ] When used alone, either magnetic or dielectric MW thermosensitive agents do not have excellent MW absorption (MA) capabilities. However, composites of magnetic and dielectric sensitizers are promising high‐performance MTT agents with fixed dielectric and magnetic losses.…”

Section: Introductionmentioning

confidence: 99%

“…[ 22 ] The excellent MA performance of Fe 3 O 4 @C@MoS 2 composite can be attributed to synergistic effects and multiple components effects. [ 23 ] The improved MA performance is attributed to the polarization loss, and the synergistic effect. [ 25–27 ] These studies provide references for the design and construction of highly efficient absorbers.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Composite Rapidly Treats Staphylococcus aureus‐Infected Osteomyelitis through Microwave Strengthened Thermal Effects and Reactive Oxygen Species

Jin

Zheng

Liu

et al. 2022

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It is difficult to effectively treat bacterial osteomyelitis using photothermal therapy or photodynamic therapy due to poor penetration of light. Here, a microwave (MW)‐excited magnetic composite of molybdenum disulfide (MoS2) / iron oxide (Fe3O4) is reported for the treatment of bacteria‐infected osteomyelitis. In in vitro and in vivo experiments, MoS2/Fe3O4 is shown to effectively eradicate bacteria‐infected mouse tibia osteomyelitis, due to MW thermal enhancement and reactive oxygen species (ROS) (1O2 and ·O2–) production under MW radiation. In addition, the mechanism of MW heat generation is proposed by MW network vector analysis. By the density functional theory and finite element method, the ROS generation mechanism is proposed. The synergy or conductive network between dielectric MoS2 and magnetic Fe3O4 can reach both enhancement of the dielectric and magnetic attenuation capability. In addition, abundant interfaces are generated to enhance the attenuation of electromagnetic waves by MoS2 and Fe3O4, introducing multiple reflections and interfacial polarization. Therefore, MoS2/Fe3O4 has excellent MW absorption ability based on the synergy or conductive network between MoS2 and magnetic Fe3O4 as well as multiple dielectric reflections and interfacial polarization.

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3D core-shell Fe3O4@SiO2@MoS2 composites with enhanced microwave absorption performance

Cited by 89 publications

References 62 publications

Preparation of magnetic silica supported Brønsted acidic ionic liquids for the depolymerization of lignin to aromatic monomers

Preparation of magnetic silica supported Brønsted acidic ionic liquids for the depolymerization of lignin to aromatic monomers

Decorating CoNi Alloy-Encapsulated Carbon Nanotube Hollow Nanocages to Enable Dielectric Loss for Highly Efficient Microwave Absorption

Magnetic Composite Rapidly Treats Staphylococcus aureus‐Infected Osteomyelitis through Microwave Strengthened Thermal Effects and Reactive Oxygen Species

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