Microwave shielding properties of Co/Ni attached to single walled carbon nanotubes

Singh, Bhanu Pratap; Saket, Devendra Kumar; Singh, Awantika; Pati, Santwana; Gupta, Tejendra K.; Singh, Vidya Nand; Dhakate, Sanjay R.; Sk, Dhawan; Kotnala, R.K.; Mathur, R.B.

doi:10.1039/c5ta02381e

Cited by 95 publications

(37 citation statements)

References 33 publications

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“…For absorbing applications in high frequency range (in the GHz range), magnetic metallic materials were considered good candidates since the shielding should satisfy the impedance matching condition

μ_{r} / ϵ_{r} \sim 1

, making magnetic and dielectric properties essential for a good absorber. Nevertheless, the relative complex permeability of magnetic metallic materials decreases due to eddy currents induced by electromagnetic waves . Thus, it may be better to use isolated metallic particles having sizes smaller than the skin depth of electromagnetic waves .…”

Section: Magnetic Nanoparticles Inclusionsmentioning

confidence: 99%

Electromagnetic Shielding Materials in GHz Range

González

Pozuelo

Baselga

2018

The Chemical Record

126

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The state-of-the art in the design and the manufacture methods of the different electromagnetic shielding materials has been reviewed. This topic has become a mainstream field of research because of the electromagnetic pollution generated by telecommunication technology development. The review is centred in absorbent materials and shows a general overview of how the absorption properties of such composites can be tailored through changes in geometry, composition, morphology, and the filler particles content. Although different types of materials are explained, the text is mainly focused on carbon materials such as graphene and carbon nanotubes. In this way, the importance of the dispersion of the conductive fillers in different polymer matrices is discussed. In addition, an extensive study on new complex architectures such as foam-based materials is presented. Finally, the combination of carbon fillers with other constituents such as metallic nanoparticles is mentioned. In all these studies, the efficiency of the composites as absorbent or reflective of electromagnetic radiation is discussed.

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μ_{r} / ϵ_{r} \sim 1

Section: Magnetic Nanoparticles Inclusionsmentioning

confidence: 99%

Electromagnetic Shielding Materials in GHz Range

González

Pozuelo

Baselga

2018

The Chemical Record

126

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“…The SE of metal nanoparticle-decorated CNTs was previously shown to increase due to the introduction of magnetic permeability that increases EM wave absorption51. Co/Ni nanoparticles attached to single-walled CNTs exhibited similar effective microwave shielding behavior52. Here, Ag nanoparticle-decorated multilayered graphene contributed to an additional SE, and the overall SE increased with an increase in Ag-graphene content.…”

Section: Resultsmentioning

confidence: 68%

Microwave-synthesized freestanding iron-carbon nanotubes on polyester composites of woven Kevlar fibre and silver nanoparticle-decorated graphene

Hazarika

Deka

Kim

et al. 2017

Sci Rep

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We synthesized Ag nanoparticle-decorated multilayered graphene nanosheets (Ag-graphene) from graphite nanoplatelets and silver nitrate through 90–100 s of microwave exposure, without the use of any mineral acids or harsh reducing agents. Fe nanoparticle-decorated carbon nanotubes (Fe-CNTs) were grown on polypyrrole (PPy) deposited on woven Kevlar fibre (WKF), using ferrocene as a catalyst, under microwave irradiation. Fe-CNTs grown on WKF and Ag-graphene dispersed in polyester resin (PES) were combined to fabricate Ag-graphene/Fe-CNT/PPy-coated WKF/PES composites by vacuum-assisted resin transfer moulding. The combined effect of Fe-CNTs and Ag-graphene in the resulting composites resulted in a remarkable enhancement of tensile properties (a 192.56% increase in strength and 100.64% increase in modulus) as well as impact resistance (a 116.33% increase). The electrical conductivity significantly increased for Ag-graphene/Fe-CNT/PPy-coated WKF/PES composites. The effectiveness of electromagnetic interference shielding, which relies strongly on the Ag-graphene content in the composites, was 25 times higher in Ag-graphene/Fe-CNT/PPy-coated WKF/PES than in neat WKF/PES composites. The current work offers a novel route for fabricating highly promising, cost effective WKF/PES composites through microwave-assisted synthesis of Fe-CNTs and Ag-graphene.

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“…The ferrofluid [1,2] response to external fields is a key factor for its applications. Firstly, in this regard, an attention should be given to high-performance microwave absorbers designed in a complex manner, which are under intense investigation now [3][4][5][6][7]. Secondly, a special attention deserves magnetic fluid hyperthermia method for cancer treatment [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Energy dissipation of rigid dipoles in a viscous fluid under the action of a time-periodic field: The influence of thermal bath and dipole interaction

Lyutyy

Reva

2018

Phys. Rev. E

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Ferrofluid heating by an external alternating field is studied based on the rigid dipole model, where the magnetization of each particle in a fluid is supposed to be firmly fixed in the crystal lattice. Equations of motion, employing Newton's second law for rotational motion, the condition of rigid body rotation, and the assumption that the friction torque is proportional to angular velocity are used. This oversimplification permits us to expand the model easily: to take into account the thermal noise and interparticle interaction that allows us to estimate from unified positions the role of thermal activation and dipole interaction in the heating process. Our studies are conducted in three stages. The exact expressions for the average power loss of a single particle are obtained within the dynamical approximation. Then, in the stochastic case, the power loss of a single particle is estimated analytically using the Fokker-Planck equation and numerically using the effective Langevin equation. Finally, the power loss for the particle ensemble is obtained using the molecular dynamics method. Here, the local dipole fields are calculated approximately based on the Barnes-Hut algorithm. The revealed trends in the behavior of both a single particle and the particle ensemble suggest the way of choosing the conditions for obtaining the maximum heating efficiency. The competitiveness character of the interparticle interaction and thermal noise is investigated in detail. Two situations, when the thermal noise rectifies the power loss reduction caused by the interaction, are described. The first of them is related to the complete destruction of dense clusters at high noise intensity. The second one originates from the rare switching of the particles in clusters due to thermal activation, when the noise intensity is relatively weak. In this way, the constructive role of noise appears in the system.

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Microwave shielding properties of Co/Ni attached to single walled carbon nanotubes

Cited by 95 publications

References 33 publications

Electromagnetic Shielding Materials in GHz Range

Electromagnetic Shielding Materials in GHz Range

Microwave-synthesized freestanding iron-carbon nanotubes on polyester composites of woven Kevlar fibre and silver nanoparticle-decorated graphene

Energy dissipation of rigid dipoles in a viscous fluid under the action of a time-periodic field: The influence of thermal bath and dipole interaction

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