Aggregation and stabilization of shungite carbon nanoparticles

Rozhkova, N. N.

doi:10.1134/s1070363213130136

Cited by 18 publications

(9 citation statements)

References 12 publications

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“…Stable aqueous dispersions of shungite with carbon concentration of 0.1 mg/ml are produced by ultrasonic treatment of the shungite powder (98 wt.% carbon, from Shun'ga deposit) at a frequency of 22 kHz and an operating power of 300 W according to the protocols described in [10,18,19]. The dispersions were filtrated and ultracentrifuged in RotinaR centrifuge (30 min, 700 rpm).…”

Section: Methodsmentioning

confidence: 99%

Comparative studies of optical limiting in fullerene and shungite nanocarbon aqueous dispersions

Белоусова

Videnichev

Kislyakov

et al. 2014

Opt. Mater. Express

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Optical limiting properties of natural carbon nanoparticles (Shungite carbon) and fullerene aggregates in aqueous dispersions were for the first time studied and juxtaposed. For the picosecond laser pulses both dispersions exhibited comparable optical limiting property, apparently due to nonlinear absorption (mainly TPA). In the domain of the nanosecond laser pulses, nonlinear scattering NLS is thought to be main optical limiting mechanism in the dispersions under study. Shungite carbon dispersion showed stronger optical limiting (being similar to CBS) in visible and IR, which we ascribe to its structure more favorable to the thermal relaxation processes responsible for the NLS mechanism.

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Section: Methodsmentioning

confidence: 99%

Comparative studies of optical limiting in fullerene and shungite nanocarbon aqueous dispersions

Белоусова

Videnichev

Kislyakov

et al. 2014

Opt. Mater. Express

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“…The third-level structure of the amorphics reliably follows from the porous structure evidently observed experimentally [26, 29. It is constructed from the BSUs stacks but the final compositions depends on the stacks lateral dimension. When the latter is at the first nanometer level, the composition presents globules of ~10 nm in size, which corresponds to pores, size of which is first nanometers as well [30]. Further aggregation of globules leads to the formation of micro-nanosize agglomerates with pores of tens nm [26].…”

Section: Today's Presentation Of Amorphous Carbonmentioning

confidence: 99%

Amorphous state of sp² solid carbon

Sheka

Golubev

Popova

2020

Fullerenes, Nanotubes and Carbon Nanostructures

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Two-mode valence electron configuration of carbon atoms lays the foundation of the unique two-mode amorphous state of the monoatomic carbon solid. From the fundamentals of solid-state physics, sp 3 and sp 2 amorphous carbons are two different amorphous species characterized by conceptually different short-range orders, namely, groups of tetrahedrally bonded sp 3 configured atoms and nanoscale size-restricted sp 2 graphene domains framed with heteroatom necklaces. Molecular character of sp 2 amorphics is coherent with the reaction mechanism of the solid amorphicity in due course of the enforced fragmentation.

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“…In additions to carbon and the mineral phase, shungite rocks usually contain insignificant amounts of soluble organic substances represented by compounds of an aliphatic series, first of all, saturated ketones and esters with a branched structure, with trace amounts of aromatic compounds [9].…”

Section: Introductionmentioning

confidence: 99%

Physico-Chemical Characteristics of Shungite Rock of Kazakhstan

et al. 2013

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Physico-chemical characteristics of shugite rocks of Kazakhstan (Bakyrchik deposit) were studied using the methods of elementary analysis, IR-spectroscopy, scanning electron microscopy, Raman spectroscopy and X-ray phase analysis. The content of carbon in shungite rock was determined to be from 3% to 19%. The flotation technology for shungite rocks of Kazakhstan was developed, the content of carbon in the concentrate reaching 40.0%. When studying the elemental composition, the mineral part of shungite rocks was stated to be presented, mainly, by silicon, aluminium, calcium, magnesium, potassium, sodium, iron and titanium oxides. IR-spectroscopic investigations showed that in the concentrate, apart from polycyclic hydrocarbons containing methylene groups, there appeared carboxyl groups. The results of scanning electron microscopy (SEM) showed that flotation and thermal activation of shungite rocks on carbon allow obtaining a more developed surface structure and porosity. The structure of shungite carbon was shown by the method of Raman scattering to be close to that of glassy carbon. The results of X-ray diffraction analysis (XRD) of natural shungite rocks showed that the samples under study contained a carbonaceous substance and a number of mineral components: quartz, illite, bassanite, burgerite, muscovite. It is shown that shungite carbon of “Bakyrchik” deposit is identical to shungite of Zazhogino deposit in Russia. The stated physicochemical characteristics allow to determine the directions of the use of carbon concentrate for solution of ecological and technological problems.

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Aggregation and stabilization of shungite carbon nanoparticles

Cited by 18 publications

References 12 publications

Comparative studies of optical limiting in fullerene and shungite nanocarbon aqueous dispersions

Comparative studies of optical limiting in fullerene and shungite nanocarbon aqueous dispersions

Amorphous state of sp² solid carbon

Physico-Chemical Characteristics of Shungite Rock of Kazakhstan

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Aggregation and stabilization of shungite carbon nanoparticles

Cited by 18 publications

References 12 publications

Comparative studies of optical limiting in fullerene and shungite nanocarbon aqueous dispersions

Comparative studies of optical limiting in fullerene and shungite nanocarbon aqueous dispersions

Amorphous state of sp2 solid carbon

Physico-Chemical Characteristics of Shungite Rock of Kazakhstan

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Product

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About

Amorphous state of sp² solid carbon