Electromagnetic shielding effectiveness of lightweight and flexible ultrathin shungite plates

Антонец, И. В.; Golubev, Yevgeny A.; Shcheglov, V. I.; Sun, Shi-Yong

doi:10.1016/j.cap.2021.06.008

Cited by 13 publications

(9 citation statements)

References 34 publications

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“…As our studies have shown, samples from the Maksovo and Shunga deposits exhibit high microwave reflective and conductive properties [ 78 , 79 ]. Even ultrathin shungite plates with a thickness of 8–15 µm in the ranges of 8–12 and 26–38 GHz reflect (95 ± 2)% of the total incident radiation, and the shielding efficiency reaches almost 100% ( Figure 14 ) [ 80 ]. It should be noted that the microwave reflective properties of shungite plates are practically independent of frequency, keeping them in a wide range [ 79 ].…”

Section: Conductive Properties Of Natural Disordered Sp ...mentioning

confidence: 99%

“…In [ 80 , 90 , 91 ], schemes were proposed for the interaction of electromagnetic radiation with shungite carbon ( Figure 17 ). Although, it should be noted that in [ 90 , 91 ], the pressed powder from the shungites of the Zazhoginsky occurrence with a carbon content of about 30% was studied.…”

Section: Models Of Electrical Conductivitymentioning

confidence: 99%

“…At the same time, multiple internal reflection of electromagnetic waves is provided precisely by carbon micro- and nano-structures and porosity. In addition, the absorption properties are improved even with a small content of heteroatoms (H, O, N, S), which produce polarization centers and enhance absorption properties [ 80 ].…”

Section: Models Of Electrical Conductivitymentioning

confidence: 99%

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Electrophysical Properties and Structure of Natural Disordered sp2 Carbon

Golubev

Антонец

2022

Nanomaterials

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The progress in the practical use of glassy carbon materials has led to a considerable interest in understanding the nature of their physical properties. The electrophysical properties are among the most demanded properties. However, obtaining such materials is associated with expensive and dirty processes. In nature, in the course of geological processes, disordered sp2 carbon substances were formed, the structure of which is in many respects similar to the structure of glassy carbon and black carbon, and the electrical properties are distinguished by a high-energy storage potential and a high efficiency of shielding electromagnetic radiation. Given the huge natural reserves of such carbon (for example, in the shungite rocks of Karelia) and the relative cheapness and ease of producing materials from it, the study of potential technological applications and the disclosure of some unique electrophysical properties are of considerable interest. In this paper, we present an overview of recent studies on the structure, electrophysical properties, and technological applications of natural disordered sp2 carbon with the addition of novel authors’ results.

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Section: Conductive Properties Of Natural Disordered Sp ...mentioning

confidence: 99%

Section: Models Of Electrical Conductivitymentioning

confidence: 99%

Section: Models Of Electrical Conductivitymentioning

confidence: 99%

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Electrophysical Properties and Structure of Natural Disordered sp2 Carbon

Golubev

Антонец

2022

Nanomaterials

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“…The high screening ability of shungite is conditioned by its electrical conductivity, the main role in the formation of which is played carbon, grouped in the form of finite spatial regions separated by interlayers of quartz [4][5][6][7][8]. An important tool to study the shungite structure at the micro level is resistive microscopy, which allows obtaining conductivity maps that reflect the mutual spatial distribution of carbon and quartz and, based on the analysis of such maps, determine the integral conductivity of the sample as a whole [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Influence of layers orientation of graphene stacks in shungite disordered carbon to its integral electrical conductivity

Антонец

Golubev

Ignatiev

et al. 2022

J. Phys.: Conf. Ser.

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The map of carbon distribution in the sample of graphene-containing shungite is investigated by the electron microscopy. It is found the large quantity of stacks which are formatted by parallel disposed layers of graphene. The model of electrical conductivity of graphene stack is proposed. This model takes into consideration the arbitrary orientation of layers relatively to the direction of current. It is made the numerical calculation of dependence of conductivity from the orientation of graphene layers. It is found the sharp abatement of conductivity by the orientation of graphene layers relatively to the current direction along the corner near the 45 degree. The obtained peculiarities are explained by the influence of geometrical factor.

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“…Due to the fact that shungite contains nanotubes and fullerenes in its structure, this mineral is highly porous. Shungite also exhibits conductive properties and considerable mechanical strength [35][36][37]. Its modulus of elasticity is the highest among all of the carbon materials, including graphite.…”

Section: Introductionmentioning

confidence: 99%

Comparison of How Graphite and Shungite Affect Thermal, Mechanical, and Dielectric Properties of Dielectric Elastomer-Based Composites

et al. 2021

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The aim of this work involved comparing the effect graphite and shungite have on the properties of dielectric elastomer-based materials. For this reason, dielectric elastomer–Sylgard (S) was filled with 1, 3, 5, 10, and 15 wt.% of graphite (G) and shungite (Sh). The structure of the obtained materials was studied by means of scanning electron microscopy and atomic force microscopy. The influence of the introduced additives on the thermal stability of the obtained composites was evaluated using thermogravimetry. Moreover, the mechanical properties and the dielectric constant of the elastomer with an addition of graphite and shungite were determined. Obtained results allowed us to establish that the presence of graphite as well as shungite significantly influences mechanical as well as dielectric properties. Additionally, the optimum mass of additives, allowing to increase the dielectric constant without the significant decrease of strain at break, was indicated. In the case of materials containing graphite, regardless of the filler content (1–15 wt.%), the mechanical as well as the dielectric properties are improved, while in the case of composites with an addition of shungite exceeding the 5 wt.% of filler content, a reduced tensile strength was observed.

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Electromagnetic shielding effectiveness of lightweight and flexible ultrathin shungite plates

Cited by 13 publications

References 34 publications

Electrophysical Properties and Structure of Natural Disordered sp2 Carbon

Electrophysical Properties and Structure of Natural Disordered sp2 Carbon

Influence of layers orientation of graphene stacks in shungite disordered carbon to its integral electrical conductivity

Comparison of How Graphite and Shungite Affect Thermal, Mechanical, and Dielectric Properties of Dielectric Elastomer-Based Composites

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