Development of polymer radio-absorbing materials with carbon nanotubes for extremely high frequency range

Захарычев, Е. А.; Ryabov, S. A.; Zefirov, V. L.; Semchikov, Yu. D.; Belov, M.; Kirpichev, Dmitrii; Зуев, А. А.

doi:10.1134/s2075113313050201

Cited by 8 publications

(5 citation statements)

References 9 publications

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“…CNT-2 have a high aspect ratio and provide the similar absorbing ability at less concentration of nanotubes, but in spite of that, CNT-2 concede to CNT-1 in the effectiveness of its application in RAMs. CNT-3 are significantly less in the effectiveness in comparison with another species of nanotubes and similar to the standard carbon modifications such as graphite and carbon black by the influence on radar absorbing properties of the material [13].…”

Section: Resultsmentioning

confidence: 99%

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Radar absorbing properties of carbon nanotubes/polymer composites in the V-band

et al. 2016

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This research is devoted to the study of radar absorbing properties of the composites, based on the epoxy binder and carbon nanotubes (CNT) in the frequency range of 52-73 GHz. Three species of unmodified multi-walled CNT differing in length and diameter were investigated as fillers. The reflection coefficients (K refl) at the radar absorbing material (RAM)-air interface and the electromagnetic radiation (EMR) absorption coefficients (K abs) in the materials with the different content of nanotubes were measured (K refl and K abs were calculated using the highest (the worst) value of the voltage standing-wave ratio (VSWR) in the frequency range of 52-73 GHz). It was established that the increase in nanotubes aspect ratio (a ratio of CNT length to its diameter) leads to K abs rising for polymer composites. Also, CNT diameter decrease leads to K refl reduction. CNT of 8-15 nm in diameter and more than 2 μm in length are the most effective from all investigated fillers. The reflection loss values were calculated and CNT optimal concentrations were obtained at different thickness of RAMs.

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Section: Resultsmentioning

confidence: 99%

“…Radar absorbing properties of the samples were measured with panoramic meter R2-69 as it was described in ref. [13]. An antenna was closely attached to the sample (figure 1a) and the VSWR maximum was measured in the range of frequencies from 52 to 73 GHz.…”

Section: Methods Of Investigationmentioning

confidence: 99%

Radar absorbing properties of carbon nanotubes/polymer composites in the V-band

et al. 2016

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“…The radar-absorbing properties of the samples were measured with an R2-69 panoramic device for measuring the standing wave voltage coefficient (SWVC) and attenuation, following the procedure described in detail previously [9]. An antenna with which the maximal SWVC was measured in the frequency range 52-73 GHz was arranged immediately adjacent to the sample.…”

Section: Methodsmentioning

confidence: 99%

Effect of functionalization of carbon nanotubes on the radar-absorbing properties of polymeric composites based on them

et al. 2015

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The effect of functionalization of carbon nanotubes in a mixture of sulfuric and nitric acids on the radar-absorbing properties of polymeric composites based on them was studied. The optimum functionalization conditions were determined, allowing the thickness of the radar-absorbent material to be decreased by 36-46% (with its characteristics preserved) relative to the analogous composites with unmodifi ed nanotubes.Radar-adsorbent materials (RAMs) are used for the absorption of the incident electromagnetic radiation (EMR) at minimal refl ection level, which allows solution of diverse problems, from the absorption of "parasitic" radiations inside high-frequency units of various devices to a decrease in the radiolocation visibility of military items. Polymeric composites with carbon nanotubes (CNTs) as RAMs have been extensively studied recently. Various procedures are used for CNT modifi cation aimed at increasing the effi ciency of EMR absorption. They are mostly based on incorporation of various substances (metals [1-4], alloys [5], oxides [6,7], salts [8]), on the surface and/or into internal voids of CNTs. Depending on the concentration of the modifying substances, they occur in the forms of a surface layer, of nanothreads inside the CNTs, or of particles inside CNTs or on their surface. Such procedures are aimed at altering the electrophysical properties of the CNTs themselves. On the other hand, the properties of the composites under consideration are strongly infl uenced not only by the parameters of the nanotubes, but also by the character of their distribution in the polymeric matrix. It is known that the initial CNTs are distributed in the polymeric matrix nonuniformly because of their tendency to agglomeration. The same is true for the nanotubes modifi ed by the above procedures. The widely used way to reach uniform distribution in the polymeric matrix is chemical modifi cation (functionalization) of CNTs with the formation of active functional groups (e.g., carboxy groups) on their surface. However, the effect of CNT functionalization on the radar-absorbing properties of polymeric composites based on them was not studied in detail previously.In this work we studied the radar-absorbing properties of polymeric composites with CNTs in relation to the CNT content and degree of functionalization.The radar-absorbing properties were studied in the range 52-73 GHz (millimeter wavelength range). The devices operating in this range include those for measuring the fl ow rate, humidity, and compressibility coeffi cient of gases, airplane landing systems, protected communication systems, devices for studying rapid processes, some medical devices, systems for detection and high-precision following of low-fl ying and mobile surface targets, and antenna feeder systems for on-board radioelectronic systems. EXPERIMENTALOur experiments were performed with CNTs of grade Taunit-M [TU (Technical Specifi cation) 2166-

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“…The broadband foam absorber is based on the tapered impedance theory. By increasing the impedance from open space on the absorber's incident surface to high impedance of losing material at the rear side, energy is consumed and decreased when the absorber propagates by the ohmic loss [15]. On the other hand, flat absorbers consist of homogeneous materials layers such that the final assembly has an increasing impedance.…”

Section: Ram Types and Polymersmentioning

confidence: 99%

“…The only important frequency dependency that falls into these synthesized absorbers is that between the carbon particles, which acts as a condenser, by the separation resin. Carbon-based absorbers primarily have an electrical trigger for field failure [17]. They are the induced currents that dissipate the energy into heat.…”

Section: Fig 3 Properties Of Polymers Used In Rammentioning

confidence: 99%

Radio Absorbing Material for Next-Generation Wireless Devices

Singh

2024

E3S Web Conf.

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Electrical and computer circuits are particularly susceptible to interference from a wide range of human or natural factors. Interference can occur as noise on communication equipment, flashing over televisions and computer monitors, errors in instrumentation, computer network compatibility problems, and electronic malfunctions. Material absorption and safety serve as a shield to prevent the intrusion of the radio wave from getting through critical components and ensure that electrical circuits perform as planned. Since radio frequency interference can also contribute to damage to infrastructure, proper safety and absorption can greatly increase the service life of electrical and electronic equipment. This paper presents a holistic view of the basic concepts of electromagnetic analysis and developments in radio absorbing materials.

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Development of polymer radio-absorbing materials with carbon nanotubes for extremely high frequency range

Cited by 8 publications

References 9 publications

Radar absorbing properties of carbon nanotubes/polymer composites in the V-band

Radar absorbing properties of carbon nanotubes/polymer composites in the V-band

Effect of functionalization of carbon nanotubes on the radar-absorbing properties of polymeric composites based on them

Radio Absorbing Material for Next-Generation Wireless Devices

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