Shungite - a carbon-mineral rock material: Its sinterability and possible applications

Obradović, Nina; Gigov, Mihajlo; Ðordjevic, Aleksandar; Kern, Frank; Dmitrovic, Svetlana; Matović, Branko; Ðordjevic, Antonije; Tshantshapanyan, A. A.; Vlahović, Branislav; Petrovič, P.; Pavlović, Vladimir B.

doi:10.2298/pac1901089o

Cited by 11 publications

(9 citation statements)

References 12 publications

(15 reference statements)

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“…No new phases were obtained during milling. However, the intensities of the peaks decreased and the peaks were broadened, which is characteristic of reduction of crystallite size and increased strain in the mechanically activated powders [29].…”

Section: Resultsmentioning

confidence: 99%

Characterization of MgAl2O4 sintered ceramics

et al. 2019

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Single phase MgAl 2 O 4 was made from a one-to-one molar ratio of MgO and Al 2 O 3 powders mixed using ball-milling. Mixtures of MgO and Al 2 O 3 were subsequently treated in planetary ball mill for 30, 60, 90 and 120 minutes in air. The aim of this study was to examine phase composition, microstructure, and densification behavior of sintered specimens. After sintering in dilatometer at 1500 °C, the powder was converted to single phase MgAl 2 O 4. The results show that mechanical activation improved the densification behavior of MgAl 2 O 4 sintered specimens, and it reduced the onset temperature for sintering by approx. 100 o C. Based on dilatometer data, powders were subsequently densified at 1450 o C by hot pressing. Almost аll specimens exhibited full density, while sample activated for 30 minutes showed the fastest densification rate.

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Section: Resultsmentioning

confidence: 99%

Characterization of MgAl2O4 sintered ceramics

et al. 2019

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“…In the case of shungite, the chemical elements such as carbon, oxygen, residual amount of ferrum, silicon, as well as compounds based on oxygen and silicon, in particular SiO 2 , have been detected. The composition of shungite was described also in the work of Obradovic et al [31].…”

Section: Morphology and Topography Of Carbonaceous Fillersmentioning

confidence: 92%

“…Shungite is a mineral that has recently increased in popularity. Shungite is a microheterogeneous natural mineral complex containing non-crystalline carbon, silicates, a small quantity of metal oxides, and organic additives [31,32]. Originally, shungite was described thanks to the resources obtained near the village of Shunga (Russia).…”

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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“…The mineral form of shungite is a non-graphitizable fullerene-like carbon, which differs from graphite in its supramolecular, atomic, and ribbon (electronic) structure [3]. A distinctive feature of shungite is its ability to form a spherical structure (an empty sphere).…”

Section: Introductionmentioning

confidence: 99%

A Study of the Antioxidant, Cytotoxic Activity and Adsorption Properties of Karelian Shungite by Physicochemical Methods

et al. 2021

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This study reveals that fossil shungite samples exhibit antioxidant activity, can reduce oxidized components, and bind to free radicals. A sample of Sh20 (size fraction—20 μm) (1.30 mg equivalents of ascorbic acid/g of shungite; 3.46 mg equivalents of trolox/g of shungite; 0.99 mg equivalents of quercetin/g of shungite) had the maximal activity according to the amperometric method. The obtained data indicate that shungite has antioxidant properties, but these are approximately 1000 times less pronounced than those of quercetin. A ShT20 sample (size fraction—20 μm + heat treatment) was found to have the highest antioxidant activity against the 2,2-diphenyl-1-picrylhydrazyl radical and cytotoxicity. Further studies, including the optimization of the antioxidant extraction conditions of shungite, and the analysis of the qualitative and quantitative composition of the obtained extracts, are required for a more accurate interpretation of the results. Shungite can be applied as an alternative to activated carbon in water purification, due to its absorption, catalytic, antioxidant, regenerating, and antibacterial properties, as well as its high environmental safety and relatively low cost. It is possible to identify new structural forms of carbon within, and other valuable properties of, shungite substance, which will make it possible to create effective technologies for the practical use of shungite rocks, particularly in the production of fullerenes and other carbon nanoclusters.

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Shungite - a carbon-mineral rock material: Its sinterability and possible applications

Cited by 11 publications

References 12 publications

Characterization of MgAl2O4 sintered ceramics

Characterization of MgAl2O4 sintered ceramics

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

A Study of the Antioxidant, Cytotoxic Activity and Adsorption Properties of Karelian Shungite by Physicochemical Methods

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