Effect of ozone on the structure and physicochemical properties of ultradisperse diamond and shungite nanocarbon elements

Rozhkova, N. N.; Gorlenko, L.E.; Emel’yanova, G. I.; Jankowska, A.; Коробов, М.В.; Лунин, В. В.; Ōsawa, Eiji

doi:10.1351/pac-con-08-11-18

Cited by 16 publications

(7 citation statements)

References 19 publications

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“…Nevertheless, in fact, by now there have not been communications joining radical terminology and the vast available data concerning sp 2 amorphous carbons. At the same time, specific peculiarities concerning metal free carbocatalysis [95][96][97][98][99][100][101][102][103][104][105][106] (see a brief review of the latter state of art [107]) and electron-spin resonance [108][109][110][111][112][113][114][115] have been really observed. However, until now, they have not been connected with specific radical properties of sp 2 carbons as well.…”

Section: Post-reaction Storage Of the Spin Chemistry Productsmentioning

confidence: 99%

sp2 Carbon Stable Radicals

Sheka

2021

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sp2 Nanocarbons such as fullerenes, carbon nanotubes, and graphene molecules are not only open-shell species, but spatially extended, due to which their chemistry is quite specific. Cogently revealed dependence of the final products composition on size and shape of the carbons in use as well as on the chemical prehistory is accumulated in a particular property—the stabilization of the species’ radical efficiency, thus providing the matter of stable radicals. If the feature is highly restricted and rarely available in ordinary chemistry, in the case of sp2 nanocarbons it is just an ordinary event providing, say, tons-in-mass stable radicals when either producing such widely used technological products as carbon black or dealing with deposits of natural sp2 carbons such as anthracite, shungite carbon, and other. Suggested in the paper is the consideration of stable radicals of sp2 nanocarbons from the standpoint of spin-delocalized topochemistry. Characterized in terms of the total and atomically partitioned number of effectively unpaired electrons as well as of the distribution of the latter over carbon atoms and described by selectively determined barriers of different reactions exhibiting topological essence of intermolecular interaction, sp2 nanocarbons reveal a peculiar topokinetics that lays the foundation of the stability of their radical properties.

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Section: Post-reaction Storage Of the Spin Chemistry Productsmentioning

confidence: 99%

sp2 Carbon Stable Radicals

Sheka

2021

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“…As for natural sp 2 carbons, without touching the coals, information concerning their reactivity and catalytic ability is much scarcer, however, despite this, quite convincing. This concerns mainly shungite carbons [78][79][80][81], for which a decisive role of their BSUs for these physicochemical processes was clearly shown. Similar investigations of anthraxolites become a top point for the near future.…”

Section: Common Characteristics Of Model Bsusmentioning

confidence: 99%

sp amorphous carbons in view of multianalytical consideration: Normal, expeсted and new

Golubev

Rozhkova

Кабачков

et al. 2019

Journal of Non-Crystalline Solids

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The suggested approach "Selected set of samples + selected set of analytical tools" occurred quite efficient when applying to sp 2 amorphous carbons, thus providing a transformation of 'amorphous' representation of the issue, based on particulars, into a 'crystalline' one based on a limited set of fixed commonalities. The slogan first part implies a set of different-origin solid samples. The second part concerns analytical tools, the most suitable to achieve the goal. The parts combining means the application of each tool to the whole set of samples. In the current study, two natural sp 2 amorphous carbons, namely, shungite carbon and antraxolite, as well as two engineered products -carbon blacks CB632 and CB624, all of the four bodies belonging to the elitist highest-carbon-content sp 2 species, were subjected to analytical study by using modern structural and compositional analytical techniques. The approach has allowed disclosing the following steady points that are common to the whole class of this carbon allotrope and that may lay the foundation of consolidate, more 'crystalline' representation of what are sp 2 amorphous carbons:1. sp 2 Amorphous carbons are products of particular chemical reactions related to their basic structural units. Further macroscopic agglomeration of the latter plays a subsidiary role. 2. The units represent framed graphene molecules of 1-2 nm and 1-x*10 (x=1-3) nm in size in the case of natural and engineered products, respectively.3. Framing of graphene molecules, predominantly incomplete with respect to the number of vacant places, concerns only edge atoms and is implemented by the related chemical additives, such as hydrogen, oxygen, nitrogen, sulfur and halogens which are attached to the carbon core via chemical bonding. 4. The molecules small size provides a countable number of newly formed chemical bonds.INS and XPS allow attributing the bonds to chemical compositions restricted by number while QCh ensures reliable support. 5. Temperature and pressure as well as physical state and chemical content of surrounding media are the main factors governing geochemistry and technical chemistry of carbon products. 6. Graphene molecules, laying the foundation of sp 2 amorphous carbons, are strongly radicalized due to which the latter acquire a new facet in the space of their properties, being the largest repository of stable radicals.

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“…Detonation nanodiamonds have been used as effective and stable catalysts [21] and catalyst supports [22]. Therefore the study of the structure as well as the surface properties of such species is of great importance.…”

Section: Introductionmentioning

confidence: 99%

Paramagnetic centers in detonation nanodiamonds studied by CW and pulse EPR

Fionov

Lund

Chen

et al. 2010

Chemical Physics Letters

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Dispersed detonation nanodiamonds have been studied by continuous-wave (CW) and pulse EPR techniques. The spectrum of bulk radicals (g = 2.0025 ± 0.0002, a Lorentz line shape with ΔH pp = 0.95 ± 0.05 mT) dominated in CW EPR and prevented to record spectra from other paramagnetic species. The pulse EPR spectrum was the superposition of the distorted P1-center spectrum with parameters (g = 2.0025, A xx = 2.57 mT, A yy = 3.08 mT, A zz = 4.07 mT), the H1-center spectrum (g = 2.0028) and the single line (g = 2.0025, ΔH pp = 0.40 ± 0.05 mT) from other centers which may be assigned to surface radicals. The concentration of P1-centers has been estimated by CW EPR as 2 ± 1 ppm N.

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Effect of ozone on the structure and physicochemical properties of ultradisperse diamond and shungite nanocarbon elements

Cited by 16 publications

References 19 publications

sp2 Carbon Stable Radicals

sp2 Carbon Stable Radicals

sp amorphous carbons in view of multianalytical consideration: Normal, expeсted and new

Paramagnetic centers in detonation nanodiamonds studied by CW and pulse EPR

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