Broadband microwave absorption enabled by a novel carbon nanotube gratings/cement composite metastructure

Wang, Xiaoran; Li, Qinghua; Lai, Haoxin; Yu, Peng; Xu, Sheng

doi:10.1016/j.compositesb.2022.110071

Cited by 47 publications

(4 citation statements)

References 67 publications

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“…To create conductive gratings using a carbon nanotube (CNT), Wang et al [143] combined a cement composite with aluminum silicate ceramic fiberboard as the dielectric layer, resulting in a unique and practical cementitious metastructure. The microwave absorption of prepared specimens was greatly enhanced by an absorbing metastructure based on CNT gratings.…”

Section: Mw-t Of Cementitious Materials/concrete and Scmsmentioning

confidence: 99%

Novel Processing Methods of Low-Clinker Multi-Component Cementitious Materials—A Review

Lisowski,

Glinicki

2024

Applied Sciences

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The wide use of multi-component cement of highly reduced Portland clinker factor is largely impeded by detrimental changes in the rheological properties of concrete mixes, a substantial reduction in the early rate of cement hardening, and sometimes the insufficient strength of mature concrete. Therefore, major changes are needed in traditional concrete-production technologies if low-clinker cement is to gain wider acceptance. This review’s goal is to summarize the impacts of using non-ionizing radiation methods to improve the dispersion of concrete mix constituents, cement setting, and early hardening. The potential impacts of such interactions on the permeability and strength of concrete are also highlighted and investigated. Their intriguing potential for delivering additional energy to cementitious mixtures is analyzed for batch water, solid non-clinker constituents of cement (mainly supplementary cementitious materials), and their mixtures with aggregates. The advantages of adopting these non-traditional methods are found to be highly alluring to the greener preparation techniques used in the construction materials sector.

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Section: Mw-t Of Cementitious Materials/concrete and Scmsmentioning

confidence: 99%

Novel Processing Methods of Low-Clinker Multi-Component Cementitious Materials—A Review

Lisowski,

Glinicki

2024

Applied Sciences

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“…Metamaterials, artificially manufactured and absent in nature, typically exhibit negative refraction, negative permittivity, negative permeability, and perfect absorption due to strong coupling effects, usually achieving an RL of less than −10 dB 13,14 . Hossain utilized a metamaterial composed of double E‐shaped symmetric split ring resonators, Wang employed carbon nanotube periodic gratings, and Hannan implemented identical concentric copper SRRs to achieve strong resonance effect 15–17 . The absorption rates achieved were 99.9% (−40 dB), 99.9% (−38.7 dB), and 99.5% (−30 dB), respectively.…”

Section: Introductionmentioning

confidence: 99%

“…13,14 Hossain utilized a metamaterial composed of double E-shaped symmetric split ring resonators, Wang employed carbon nanotube periodic gratings, and Hannan implemented identical concentric copper SRRs to achieve strong resonance effect. [15][16][17] The absorption rates achieved were 99.9% (−40 dB), 99.9% (−38.7 dB), and 99.5% (−30 dB), respectively. The absorption mechanism of broadband microwave absorbers is usually qualitative rather than quantitative, which hinders people from gaining a clear understanding.…”

Section: Introductionmentioning

confidence: 99%

Enhanced microwave absorption of refractory SiBCN metamaterials

Qiao,

Li,

Chen

et al. 2024

J Am Ceram Soc.

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So far, developed microwave absorbers exhibit significant changes in absorption with temperature, which hinder their operation within a wide temperature range. In this paper, a microwave absorber based on SiBCN ceramics was prepared. Due to the excellent high‐temperature stability of SiBCN ceramics, its permittivity changes less with temperature, avoiding the issue of performance deterioration or even failure that traditional refractory absorbers face at high temperatures. The experiment proves the absorption bandwidth for –15 dB of the SiBCN metamaterials absorber (SMA) is 12 GHz at 800°C, with a maximum absorptivity of 99.99%. According to the computed data, the resonance loss contributes 81.9 to 94.5% of the microwave absorption of SMA. This work demonstrates significant potential for applications in radar stealth under harsh conditions.

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“…For this purpose, several high-performing EMA’s have been created in which carbon-based polymer composites are regarded as advantageous and promising candidates for highly efficient EMA with excellent thermal management capacities, lightweight, cost-effective, enhanced electric and heat conductivity, high dielectric loss, high mechanical stability, and excellent corrosion resistance. − However, the ability of the carbon nanofillers to agglomerate in the form of bundles results from the presence of powerful intermolecular van der Waals interaction, deteriorates the capabilities of carbon nanofillers for EM absorption, and restricts their applicability in industrial applications. , For this purpose, various techniques have recently been used to construct carbon-decorated hybrid morphologies consisting of magnetic or dielectric particles. − For example, Bao et al synthesized the bifunctional hollow Fe@C microsphere and fabricated the nanocomposite microwave absorber by mixing Fe@C (60 wt %) in paraffin, displaying a wide EAB of 7.52 GHz (10.48–18 GHz) at a 1.75 mm thickness . Gou et al made a 2.5 mm thickness nanocomposite consisting of polydimethylsiloxane (PDMS)/CeFe 2 O 4 /graphene oxide (GO) (60 wt %) in paraffin (40 wt %) and achieved the minimum R L value of −52 dB with an EAB of 2.1 GHz (Ku band) .…”

Section: Introductionmentioning

confidence: 99%

Flexible, Stretchable, and Lightweight Hierarchical Carbon-Nanotube-Decorated Carbon Fiber Structures for Microwave Absorption

Tahalyani

Akhtar

Kar

2023

ACS Appl. Nano Mater.

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Highly flexible, bendable, stretchable, and ultralightweight microwave absorbers (MA) that can handle harsh environments are essential for conformal surface coating in aerospace and defence industries. Hence, crystalline carbon nanotubes (CNTs) are grown on carbon fibers (CFs) using the chemical vapour deposition technique (CVD) and embedded in polyurethane (PU) to obtain MA. The fabricated MA is flexible, highly stretchable (>400%), has a low percolation threshold (0.1 wt %), ultralightweight (0.35 wt %), and thin nanocomposite for enhanced microwave absorber performance. The thickness of MA is optimized to achieve the impedance matching condition by utilizing the CST microwave studio simulation and verified experimentally. The minimum reflection loss (R L) of −52.53 dB with effective absorber bandwidth (EAB) covering the complete X band at a 2.4 mm thickness is obtained for just 0.35 wt % CFCNT. The negligible change in R L and EAB after 1000 bending cycles and 2 h of water-bath sonication confirms the operating efficiency of MA in harsh environmental conditions. The mechanism of microwave absorption in the case of CF and CFCNT-based MA is elucidated concerning microwave properties, electrical conductivity, and morphology. The CST microwave studio simulation is also extended from the X band to the Ku band (12.4–18 GHz) for broadband microwave absorber application.

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Broadband microwave absorption enabled by a novel carbon nanotube gratings/cement composite metastructure

Cited by 47 publications

References 67 publications

Novel Processing Methods of Low-Clinker Multi-Component Cementitious Materials—A Review

Novel Processing Methods of Low-Clinker Multi-Component Cementitious Materials—A Review

Enhanced microwave absorption of refractory SiBCN metamaterials

Flexible, Stretchable, and Lightweight Hierarchical Carbon-Nanotube-Decorated Carbon Fiber Structures for Microwave Absorption

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