Radio-absorbing properties of nickel-containing schungite powder

Лыньков, Л. М.; Борботько, Т. В.; Krishtopova, E. A.

doi:10.1134/s1063785009050071

Cited by 12 publications

(2 citation statements)

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“…Therefore, various loss mechanisms must be implemented in the screens: dielectric and magnetic losses, dispersion, diffraction, interference, and internal re-reflections of electromagnetic waves, causing additional weakening of the energy of an electromagnetic wave due to Rayleigh scattering, addition of waves in antiphase, etc. Shungite powder, due to its inhibitory properties, composite composition, low cost, and lightweight can be used as a component for the production of materials that provide effective shielding of electromagnetic radiation [ 70 , 90 , 98 , 99 , 100 ]. In addition, for example, shungite materials at a certain concentration of carbon have not only reflective, but also good absorbing properties, which expands the possibilities of their use for shielding electromagnetic radiation.…”

Section: Technological Applications Of Electrophysical Properties Of ...mentioning

confidence: 99%

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: Technological Applications Of Electrophysical Properties Of ...mentioning

confidence: 99%

Electrophysical Properties and Structure of Natural Disordered sp2 Carbon

Golubev

Антонец

2022

Nanomaterials

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“…Shungite is named after the town of Shunga (Karelia) and is an intermediate product between amorphous carbon and crystalline graphite, which contains carbon (30 wt%), quartz (45 wt%), silicate micas (~20 wt%), and various admixtures (V, Ni, Cu, Fe, and oxides thereof;Lyn'kov et al 2009). In most cases, shungite rocks of different types are distinguishable with the naked eye (Buseck 2002).…”

Section: Introductionmentioning

confidence: 99%

Microbiological and chemical properties of shungite water

Türk¹,

Tamm²,

Mändar³

et al. 2022

PEAS

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Shungite is used in water filters that remove Escherichia coli from water. The mechanism and spectrum of the antibacterial activity of shungite are not precisely known. In this study, shungite and its dried water extract were characterized by means of X-ray diffraction, X-ray fluorescence and iodometry. The dried residue of the water extract of shungite was relatively poor in carbon (28.1% in the rock vs 0.5% in the residue), silica (23.9% in the rock vs 0.3% in the residue) and potassium (1.14% vs 0.05%), but rich in sulfur (1.6% vs 21.6%) and some metals, including iron (1.4% vs 10%), aluminum (2.1% vs 5%) and nickel (0.02% vs 1.14%). The survival of Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Candida albicans, Streptococcus uberis and Saccharomyces cerevisiae in shungite water was measured. Escherichia coli, Pseudomonas aeruginosa and Streptococcus uberis did not survive for 24 hours in 3:7 shungite water extract, while Staphylococcus aureus, Candida albicans and Saccharomyces cerevisiae survived as well as in distilled water. Neutralization of pH did not abolish the bactericidal effect. However, in the presence of nutrients, shungite water did not show bacteriostatic or bactericidal effects.

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