Morphology of aluminium oxide nanostructures after calcination of arc discharge Al–C soot

Смовж, Д. В.; Sakhapov, S. Z.; Зайковский, А. В.; Новопашин, С. А.

doi:10.1016/j.ceramint.2015.03.110

Cited by 27 publications

(15 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The choice of annealing temperature for modification of composites is based on the fact that amorphous carbon burns out under similar conditions at long exposure. 34,36 In the Raman spectra of samples, a set of modes typical for carbon nanomaterials is found. These modes are located at 1581, 1332, and 2688 cm −1 and named the G-, D-, 2D-mode, respectively (Figure 4).…”

Section: Resultsmentioning

confidence: 99%

“…35 Moreover, the electric arc can be used for the synthesis of composite materials consisting of carbon and metals, oxides, or carbides. 36 In such composites, carbon acts as an amorphous matrix, whereas metals or their compounds-as active components. The electric-arc synthesis process of such materials is based on the co-spraying of a composite carbon-additive element electrode.…”

Section: Introductionmentioning

confidence: 99%

“…36 Commonly, the additive is inside the matrix or on its surface in the form of individual crystalline nanoparticles or carbides. 34,36,37 Nanoparticles can be exposed or encapsulated in the carbon (graphite) matrix. 38 Graphitization of the layers surrounding the particle is typical for materials that form metal-like carbides.…”

Section: Introductionmentioning

confidence: 99%

“…By varying the discharge parameters and adding catalytic complexes to the system, 29 it is possible to obtain all existing allotropic carbon modifications: diamonds, 30 onion‐like structures, 31 fullerenes, 32 nanotubes (CNTs), 33 graphene, 34 amorphous carbon, and so on 35 . Moreover, the electric arc can be used for the synthesis of composite materials consisting of carbon and metals, oxides, or carbides 36 . In such composites, carbon acts as an amorphous matrix, whereas metals or their compounds—as active components.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Supercapacitor behavior of carbon‐manganese oxides nanocomposites synthesized by carbon arc

et al. 2020

Self Cite

View full text Add to dashboard Cite

The Mn-CO composites were synthesized by the electric-arc discharge method. The composite materials were obtained by spraying of graphite electrode with the addition of MnO 2. The morphology of Mn-CO composites formed during electric-arc spraying of metal-carbon electrodes in various buffer gases (N 2 and He) and the effect of their subsequent annealing in an oxygen-containing atmosphere was studied. It was experimentally determined that MnO x (MnO, Mn 3 O 4) nanoparticles are mainly formed in N 2 atmosphere, and Mn 7 C 3 carbide nanoparticles are formed in He atmosphere. This phenomenon is explained by different cooling rates of the formed composites. With further annealing of materials, partial oxidation of nanoparticles and graphitization of the carbon matrix occur due to the thermal effect of the oxidation reaction. According to the study of electrochemical activity of materials in the 1 M KOH aqueous electrolyte, the materials with a higher MnO content and a higher degree of soot graphitization have the highest electrochemical capacity of 135 Fg −1 .

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Supercapacitor behavior of carbon‐manganese oxides nanocomposites synthesized by carbon arc

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Carbon materials were synthesised using a plasma‐chemical reactor detailed in Ref. . Solid graphite rods were used as sprayed anodes.…”

Section: Methodsmentioning

confidence: 99%

Electroconductive and magnetic properties of pure carbon soot produced in arc discharge: Regimes of various buffer gas pressure

Зайковский

Новопашин

2017

Physica Status Solidi (a)

Self Cite

View full text Add to dashboard Cite

The electroconductive and magnetic properties of nanomaterials containing carbon nanoforms synthesised for electrocatalytic, electrochromic and ferrofluid applications, etc., are of interest to researchers. This article aims to understand the physical effects influencing the electroconductive and magnetic properties of materials synthesised by arc discharge. The nanomaterial formation processes leading to the formation of magnetic and electroconductive structures are also discussed. Arc discharge between graphitic electrodes results in the emergence of a fan-shaped jet of helium and carbon. The gasdynamic and temperature parameters of the jet depend on the parameters of the arc discharge and the buffer gas. Variations in the parameters of the carbon vapour flow change the kinetics of carbon condensation, leading to variations in the morphology and structure of the carbon material. The main external parameter of the synthesis (buffer gas pressure) was varied in the study, and correlations between the intensity ratio of the D to G peaks on the Raman spectrum and the electrical conductivity and the magnetic susceptibility values were found. During the synthesis, nanographite structures were formed. However, the formation of an amorphous carbon structure on the free 'zig-zag' edges of the graphite fragments reduced the magnetic susceptibility, the electrical conductivity and the ID/IG ratio.The amorphous carbon layer was deposited on the graphite structure, which reduces magnetic susceptibility, electrical conductivity and the ID/IG ratio. conditions leads to changing parameters in the discharge plasma and the fan-shaped jet. A previous study [4] demonstrated that variation in external discharge conditions allows the fullerene yield to reach 15% of the produced carbon soot.Arc discharge has been widely used to synthesize highquality carbon nanotubes (CNTs) [5]. The first time CNTs were discovered in the products of the fullerene arc [6]. Since then, arc discharge CNT synthesis has been developed to produce single-walled CNTs [7] and multiwalled CNTs [8]. CNT synthesis usually includes the production of metal catalyst nanoparticles consisting of Ni, Y [7], Fe [8] etc.

show abstract

Electric Arc Synthesis of Composite Ni–C, NiO–C Nanomaterials: Structure and Electrochemical Properties

Зайковский

Ukhina

Mateishina

2022

Physica Status Solidi (a)

View full text Add to dashboard Cite

Plasma-chemical synthesis of nanomaterials is becoming more and more developed every year. One approach to plasma-chemical synthesis is the use of an electric arc discharge. The high temperatures of the discharge plasma lead to the dispersion of the consumed electrodes and the formation of a gaseous plasma-chemical system. Further expansion of the components of this mixture in the reactor chamber leads to the processes of mixing with a buffer gas, cooling, condensation, and formation of the structure of nanomaterials. In this case, the structure and composition of the formed nanomaterials strongly depend on both the composition of the plasma-chemical system and the cooling rate during expansion. [1] The most common use of carbon as a sputtered material leads to the formation of such carbon nanostructures as fullerenes, [2] graphene flakes. [3] It is known that the addition of elements such as Sn, [4] Pt, [5] Pd [6] to carbon in a plasmachemical system leads to the formation of spherical metal nanoparticles packed in a carbon matrix. The addition of such elements as W, [7] Al, [8] Fe [9] to the plasma-chemical system leads to the formation of carbide nanoparticles in the carbon matrix. In addition, the presence of certain elements affects the formation of the carbon structure itself. Thus, the presence of hydrogen, [10] oxygen, [11] or silicon [12,13] in a plasma-chemical system leads to the formation of the structure of graphene flakes. The presence of nanoparticles of the iron family (Fe, [14] Co, [15] Ni [16] ) stimulates the formation of carbon nanotubes.The processes occurring during the interaction of metal and carbon depend on such factors as the affinity of the metal to carbon, the crystal structure of metals, the ability and enthalpy of formation of carbides, the solubility of carbon in the crystal lattice, etc. The most widely studied interaction is the heating of carbon with nickel, cobalt and iron, which are well saturated with carbon and lead to graphitization of the carbon structure, while the interaction with metals such as copper or titanium does not lead to graphitization. [17] Another important factor is the size of the metal particles. Due to the large ratio of surface to bulk atoms, the melting temperature in nanoscale structures decreases and the solubility of carbon increases. [18][19][20] In this case, the graphitization of amorphous carbon in the presence of nickel nanoparticles occurs at a much lower temperature (250-300 °C) compared to bulk particles (600 °C). [21] The interaction of metal nanoparticles with carbon has been extensively studied in the field of carbon nanotube (CNT) synthesis. The mechanisms of CNT formation in the course of plasma-chemical synthesis include the formation of a carbon-saturated metal particle in the gas atmosphere, which, upon cooling, releases carbon on the surface in the form of CNTs. [22] This mechanism in a more developed form was called vapor-liquid-solid (VLS), and describes in more detail that the metal catalyst in the solid state poorly adsorbs molec...

show abstract

Morphology of aluminium oxide nanostructures after calcination of arc discharge Al–C soot

Cited by 27 publications

References 33 publications

Supercapacitor behavior of carbon‐manganese oxides nanocomposites synthesized by carbon arc

Supercapacitor behavior of carbon‐manganese oxides nanocomposites synthesized by carbon arc

Electroconductive and magnetic properties of pure carbon soot produced in arc discharge: Regimes of various buffer gas pressure

Electric Arc Synthesis of Composite Ni–C, NiO–C Nanomaterials: Structure and Electrochemical Properties

Contact Info

Product

Resources

About