Electromagnetic wave absorption properties of carbon nanocoil composites in the millimeter waveband

Suda, Yoshiyuki; Matsuo, Ryusei; Yoshii, Takamasa; Yasudomi, Shingo; Tanimoto, Tsuyoshi; Harigai, Toru; Takikawa, Hirofumi; Setaka, Toshiya; Matsuda, Ken‐ichi; Suizu, Koji; Shima, Hiroyuki

doi:10.1063/1.5021934

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…Carbon nanocoil (CNC)-based composites were prepared by dispersion in epoxy resin through ultra-sonication with low concentration (0.1-1 wt%) by Suda et al [100]. These novel CNC-based composites showed good absorption property in the W band .…”

Section: Single-layered Absorbersmentioning

confidence: 99%

Broadband millimeter-wave absorbers: a review

Choudhary

Pal

Sarkhel

2022

Int. J. Microw. Wireless Technol.

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This paper reports an exhaustive review of recent research progress in the development of millimeter-wave absorbers. With the advancement in technologies, microwave absorbers have shown their evolution in several applications such as defense, security identification, stealth technology, and several more. The importance of these absorbers is increasing due to electromagnetic interference (EMI) effects. Primarily, an abundant amount of absorbers has been developed in lower frequency bands and with the increasing demand for 5G technology, the usage of millimeter-wave bands has gained attention. This in turn requires the development of millimeter-wave absorbers to provide EMI shielding in several applications. Out of several materials, polymers have grabbed attention in the mitigation of EMI. An absorber that combines carbonaceous elements with polymers offers large design flexibility and tunability per the filler concentration. This paper focuses on the classification of these absorbers based on geometry as well as that by using polymers with their design challenges, merits, and demerits with their industrial applications. Comparative studies of geometrically based absorbers and polymeric-based absorbers are also shown.

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Section: Single-layered Absorbersmentioning

confidence: 99%

Broadband millimeter-wave absorbers: a review

Choudhary

Pal

Sarkhel

2022

Int. J. Microw. Wireless Technol.

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Optimizing the Magnetocuring of Epoxy Resins via Electromagnetic Additives

Chaudhary

Suda

et al. 2021

Adv Materials Inter

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offers a non-contact method of curing, with minimal substrate heating. Early attempts at AMF methods employed ferric oxide nanoparticles that were prone to aggregation and scorching of the resins. [5] This limited the technology to water-based formulations. Magnetocuring advances AMF induction through incorporation of Curie temperature (T c ) controlled modifiers, also known as Curie magnetic nanoparticles (CNP). Our previous magnetocuring work explored the adhesion strength for different substrates, adhesives, CNP loading, and heating properties of CNP. [1] One of the key advances in our magnetocuring methodology is preventing overheating, the main disadvantage of ferric oxide nanoparticles. Resin scorching is prevented by matching the T c of CNP to the resin activation temperature. As T c is approached, CNP's lose their ferromagnetic properties. [6] The resin temperature cannot extend beyond T c , which can be tuned by adjusting the CNP's chemical composition. However, heating rates are limited to 1.2 °C s −1 and tuneable T c are needed to pair with thermosets possessing variable temperature activation-from 80-200 °C. High saturation magnetization (M s ) is an important parameter required to obtain high heating rate. [7] However, tuning T c may result in undesirable changes in M s . [1,8] Optimization of heating rates and tuneable T c need to be compatible with good mechanical strength and nanoparticle colloidal stability within the organic resins.Generally, the heating rates of CNP can be tuned through composition, surface coatings, particle size, and percent loading. [9] However, these factors may lead to undesirable shifts in material parameters of CNP magnetic anisotropy, magnetization, and Curie temperature. Hence, other methods of temperature control were explored, that is, increasing thermal conductivity of the resin by addition of carbon allotropes. Carbon allotropes such as carbon nanotubes (CTUBE) and carbon nanocoils (CCOIL) can increase modulus and impart electromagnetic shielding. [10] Reinforcement of epoxy nanocomposites by the addition of carbon allotropes increases mechanical strength, thermal/electrical conductivity, and electromagnetic wave absorption. [10c,11] CTUBEs are composed of hexagonal rings of carbon atoms; helical variants are referred to as CCOIL. CCOIL possess additional non-hexagonal cycle carbon, such as cyclopentadiene and Magnetocuring of adhesives refers to the curing of an epoxy + Curie temperature controlled magnetic nanoparticles (CNP) composite using a suitable alternating magnetic field. The controlled heating of the CNP results in remote, wireless curing without resin overheating. However, typical CNP possess only a fraction of the heat output of ferric oxide nanoparticles, quantified as the specific absorption rate (SAR). Previous investigations of epoxy + CNP adhesives revealed a SAR of 5 W.g −1 , which is 10-100× less than that of ferric oxides. Here, it is demonstrated that SAR can be improved to up to 60 W.g −1 by tuning CNP composition and by the addition of c...

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Electromagnetic wave absorption properties of helical carbon fibers and expanded glass beads filled cement-based composites

Xie

et al. 2018

Composites Part A: Applied Science and Manufacturing

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Electromagnetic wave absorption properties of carbon nanocoil composites in the millimeter waveband

Cited by 5 publications

References 6 publications

Broadband millimeter-wave absorbers: a review

Broadband millimeter-wave absorbers: a review

Optimizing the Magnetocuring of Epoxy Resins via Electromagnetic Additives

Electromagnetic wave absorption properties of helical carbon fibers and expanded glass beads filled cement-based composites

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