Ni–C powder synthesis by a submerged pulsed arc in breakdown mode

Parkansky, N.; Frenkel, G; Alterkop, B.; Beilis, I. I.; Boxman, R.L.; Barkay, Zahava; Rosenberg, Yu.

doi:10.1016/j.jallcom.2007.10.021

Cited by 7 publications

(3 citation statements)

References 14 publications

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“…To obtain stable magnetic metal nanoparticles and to find new properties, inert matter-encapsulated magnetic metal nanoparticles have attracted extensive interest. For example, carbon-encapsulated magnetic metal nanoparticles have been prepared by various techniques, including arc techniques, 12,13 magnetron and ionbeam co-sputtering, 14 high-temperature annealing of the mixtures of carbon-based materials and metal precursors, [15][16][17] catalytic chemical vapor deposition, 18,19 pyrolysis of organometallic compounds, 20,21 catalytic decomposition of methane, 22 explosion, 23 spraying methods, 24 submerged pulsed arc in breakdown mode 25 and UHV electron-beam evaporation. 26 However, it is still a huge challenge to fabricate magnetic metal particles coated by carbon via a simple solution route.…”

Section: Introductionmentioning

confidence: 99%

Honeycomb-like Ni@C composite nanostructures: synthesis, properties and applications in the detection of glucose and the removal of heavy-metal ions

et al. 2010

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Section: Introductionmentioning

confidence: 99%

Honeycomb-like Ni@C composite nanostructures: synthesis, properties and applications in the detection of glucose and the removal of heavy-metal ions

et al. 2010

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“…The conditions for synthesis of nanosized particles in a plasma may be more favorable than conditions in a gaseous medium [10]. This is connected with the fact that generally particles in a plasma are charged and repulsion between particles of like sign limits their growth, promoting formation of a narrower final particle size distribution.Despite the promise shown by the electrical discharge method and the growing number of papers on nanoparticle synthesis in electrical discharges in a liquid [3][4][5][6][7][8][9][10][11][12], in the literature we can only find scattered papers directly studying the discharge itself that is used to obtain the nanoparticles. Nevertheless, such discharge characteristics as electron temperature and the concentration of atoms and electrons are important for optimizing the synthesis process and controlling the parameters of the synthesized particles.…”

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confidence: 99%

Spectroscopic diagnostics for an electrical discharge plasma in a liquid

et al. 2009

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We conducted spectroscopic studies of an electrical discharge plasma in a liquid, used for synthesis of nanosized particles of metals and their compounds. From the intensity ratio of the copper lines, we estimated the electron temperature, and from the Stark broadening of the hydrogen lines H α we determined the electron density in the electrical discharge plasma. Information about the concentration of copper atoms in the discharge was obtained from analysis of the spectra in the region of resonance lines of copper. We carried out a comparative analysis of the plasma parameters for spark and arc discharges in water, ethanol, and air. Based on the equation of state for an ideal plasma, taking into account the Debye correction, we estimated the pressure in the plasma channel.Key words: electrical discharge in a liquid, electron concentration and temperature, spectral line reversal, Stark broadening of spectral lines, plasma particle concentration.Introduction. Electrical discharges in a liquid are used for machining metals and melting refractory materials, sterilizing drinking water and wastewater [1, 2], as sources of sound in hydroacoustic and hydrogeological studies; and in recent years, the electrical discharge method has shown promise for synthesis of nanosized particles of metals [3], their oxides, [4,5] and their carbides [6,7]. Advantages of the electrical discharge method for nanoparticle synthesis include: the possibility of controlling the parameters of the final products by varying the discharge regimes; the rather high throughput, with the possibility of scaling up the synthesis process (in this case, the refractory nature of the metals is not important); the relatively simple equipment needed in the reactor design; the uncomplicated process for preparation of the starting materials. Application of this method also makes it possible to significantly expand the variety of materials that can be obtained (metal powders, metal oxides and carbides, composite materials, particles of mixed composition) [8,9]. The conditions for synthesis of nanosized particles in a plasma may be more favorable than conditions in a gaseous medium [10]. This is connected with the fact that generally particles in a plasma are charged and repulsion between particles of like sign limits their growth, promoting formation of a narrower final particle size distribution.Despite the promise shown by the electrical discharge method and the growing number of papers on nanoparticle synthesis in electrical discharges in a liquid [3][4][5][6][7][8][9][10][11][12], in the literature we can only find scattered papers directly studying the discharge itself that is used to obtain the nanoparticles. Nevertheless, such discharge characteristics as electron temperature and the concentration of atoms and electrons are important for optimizing the synthesis process and controlling the parameters of the synthesized particles. The electrical parameters of the discharge determine to a significant extent the erosion of the electrodes of the material, th...

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“…Розмір і концентрацію наночастинок можна контролювати енергією і тривалістю імпульсів іскрового розряду. Електричні параметри розряду значною мірою визначають ерозію електродів матеріалу [2][3][4]. Імпульсний режим дає можливість з високою точністю керувати процесом розпилення металевих або композиційних електродів.…”

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