Controllable synthesis of mesoporous carbon hollow microsphere twined by CNT for enhanced microwave absorption performance

Li, Minghang; Fan, Xiaomeng; Xu, Hailong; Ye, Fang; Xue, Jimei; Li, Xiaoqiang; Cheng, Laifei

doi:10.1016/j.jmst.2020.04.048

Cited by 141 publications

(38 citation statements)

References 44 publications

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“…Since CNT has excellent mechanical properties, it is attracting attention as a filler for reinforcing polymer materials, and is also highly expected to be used as a conductivity‐imparting material. Cao et al report in detail on the conductive mechanism of CNTs, 42 and many other researchers have contributed detailed reports on this topic 43–52 . The most common application to be developed is the use of CNTs for electromagnetic wave shielding; polymer matrix composite materials 43–48 are also attracting attention for their effects on electromagnetic wave shielding.…”

Section: Resultsmentioning

confidence: 99%

“…Cao et al report in detail on the conductive mechanism of CNTs, 42 and many other researchers have contributed detailed reports on this topic. [43][44][45][46][47][48][49][50][51][52] The most common application to be developed is the use of CNTs for electromagnetic wave shielding; polymer matrix composite materials [43][44][45][46][47][48] are also attracting attention for their effects on electromagnetic wave shielding. As seen in the development of flexible…”

Section: Characteristic Improvement By Microwave Heat Treatmentmentioning

confidence: 99%

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Preparation of high‐performance carbon nanotube/polyamide composite materials by elastic high‐shear kneading and improvement of properties by induction heating treatment

Noguchi

Niihara

Kawamoto

et al. 2021

J of Applied Polymer Sci

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Polyamide 66 (PA66) nanocomposites were prepared by compounding carbon nanotubes (CNTs) using an elastic high‐shear kneading method, and the mechanism to understand their excellent properties was verified. In addition, we developed a microwave heat treatment that increases toughness quickly and at low cost. By combining 6.6 vol% or more of CNTs, PA66 with improved mechanical properties, such as higher elastic modulus and yield strength, was achieved, making it possible to obtain a composite having excellent high‐temperature characteristics that does not melt even at a temperature above the melting point. These effects appeared to be due to defibration of CNT aggregates and isolation and dispersion in PA66. A lamellar crystal of PA66 grows around the CNT, forming an interphase. The higher performance appeared to be attributable to a continuous three‐dimensional structure in which CNTs are bound via the interphase, and the improvement of the elastic modulus of the composite material was tentatively ascribed to a Halpin‐Tsai model in which the size of the unit cell of the three‐dimensional structure is introduced. The resulting CNT/PA66 composite materials are superior not only in performance but also in price.

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Section: Resultsmentioning

confidence: 99%

Section: Characteristic Improvement By Microwave Heat Treatmentmentioning

confidence: 99%

Preparation of high‐performance carbon nanotube/polyamide composite materials by elastic high‐shear kneading and improvement of properties by induction heating treatment

Noguchi

Niihara

Kawamoto

et al. 2021

J of Applied Polymer Sci

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“…With increase of frequency, the ε′ of MF composites show a downward trend, which explained by Debye's theory. [25,26] Correspondingly, the imaginary part ε ″ of composites fluctuate in the range of 8.2-12.4 GHz and the dielectric loss tangent tanε appear similar trend, which indicating the multiple polarization come from Ti 3 C 2 T x @FCI heterogeneous Adv. Electron.…”

Section: Electromagnetic Properties At Room Temperaturementioning

confidence: 87%

Ultrathin Self‐Assembly MXene@flake Carbonyl Iron Composites with Efficient Microwave Absorption at Elevated Temperatures

Yao

Feng

Yao

et al. 2021

Adv Elect Materials

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waves produced by electronic devices, speed up information transmission while creating a lot of pollution, providing more and more harm to human beings. Thus, the investigation on lightweight and high efficiency EM absorbing materials and devices is widely developed. However, with the emergence of new application, such as 5G electronic devices, EM absorption materials are expected to show stable and efficient performance in thermal environments. There are rarely reports about EM absorbers to meet harsh requirement of thermal environments. The investigation of highly efficient, lightweight EM absorption materials at elevated temperature is still a great challenge.Recently, 2D materials apply to EM absorbers have attracted much attention. For example, graphene have been widely applied in EM absorbing materials due to high specific surface area, light weight, and excellent polarization loss, which enhance polarization to attenuate EM waves. [1] In addition, a class of metal carbide and metal nitride materials (MXene) as a new candidate in 2D materials has been extensively used in fields of EM absorbing and electromagnetic interference (EMI) shielding due to its excellent metal-like conductivity, abundant active surface functional groups, and good machine performance. [2][3][4][5] Ti 3 C 2 T x (T x represents OH, O, or F), a typical MXene material, can be used as a potential EMI material based on high conductivity, which has EMI effectiveness of 92 dB at 45 µm. [3] The metal-like conductivity of Ti 3 C 2 T x causes interface impedance mismatch resulting in poor EM absorbing performance, though there is part of the EM wave attenuation due to polarization and conductivity loss. It is considered that combination of dielectric and magnetic loss materials for high-efficiency EM wave absorbers as an effective strategy, which not only contributes to interface impedance matching of the material and EM waves, but also broadens the EM waves absorption mechanism. [6,7] Magnetic material-carbonyl iron powder, compared with ferrites and ferroalloys such as Fe 3 O 4 , [8] FeCo, [9] has the advantage of strong magnetic loss in the gigahertz frequency band, high Curie temperature, and low cost. [10] In addition, the flake carbonyl iron (FCI) possesses high anisotropy and its magnetic permeability is further enhanced. [11] It has been proven to exhibit the potential to be broadband andThe exploration for the potential lightweight and high efficiency microwave absorbers with thermal stability is a great challenge for researchers. More importantly, the electromagnetic parameters of absorbers at elevated temperatures are seldom studied. In this work, sandwich MXene-Ti 3 C 2 T x @flake carbonyl iron (MF) composites with tunable and efficient microwave absorption at elevated temperatures are successfully fabricated by an electrostatic selfassembly method. Both the complex permittivity and permeability of the MF are strongly temperature dependent in the temperature range of 298-473 K and X band (8.2-12.4 GHz). The efficient microwave ab...

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“…Among the various morphologies, one-dimensional (1D) nanostructures have attracted wide interests for their considerable advantages, such as low density and large aspect ratio [ 60 ], which performed excellent EMI shielding with absorption-dominated behavior [ 61 ]. Typically, materials with nanofibrous structure belong to 1D nanomaterials, including carbon nanotubes (CNTs) [ 62 ] and carbon nanofibers [ 63 ].…”

Section: Electromagnetic Functional Materialsmentioning

confidence: 99%

Recent Advances in Design and Fabrication of Nanocomposites for Electromagnetic Wave Shielding and Absorbing

et al. 2021

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Electromagnetic (EM) pollution has raised significant concerns to human health with the rapid development of electronic devices and wireless information technologies, and created adverse effects on the normal operation of the sensitive electronic apparatus. Notably, the EM absorbers with either dielectric loss or magnetic loss can hardly perform efficient absorption, which thereby limits their applications in the coming 5G era. In such a context, the hotspot materials reported recently, such as graphene, MXenes, and metal-organic frameworks (MOF)-derived materials, etc., have been explored and applied as EM absorbing and shielding materials owing to their tunable heterostructures, as well as the facile incorporation of both dielectric and magnetic components. In this review, we deliver a comprehensive literature survey according to the types of EM absorbing and shielding materials, and interpret the connectivity and regularity among them on the basis of absorbing mechanisms and microstructures. Finally, the challenges and the future prospects of the EM dissipating materials are also discussed accordingly.

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Controllable synthesis of mesoporous carbon hollow microsphere twined by CNT for enhanced microwave absorption performance

Cited by 141 publications

References 44 publications

Preparation of high‐performance carbon nanotube/polyamide composite materials by elastic high‐shear kneading and improvement of properties by induction heating treatment

Preparation of high‐performance carbon nanotube/polyamide composite materials by elastic high‐shear kneading and improvement of properties by induction heating treatment

Ultrathin Self‐Assembly MXene@flake Carbonyl Iron Composites with Efficient Microwave Absorption at Elevated Temperatures

Recent Advances in Design and Fabrication of Nanocomposites for Electromagnetic Wave Shielding and Absorbing

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