Production of carbon nanotubes by self-propagating high-temperature synthesis

Алексеев, Н. И.; Izotova, S. G.; Osipov, Yu. G.; Polovtsev, S. V.; Semenov, Konstantin N.; Сироткин, А. К.; Чарыков, Н. А.; Kernozhitskaya, S. A.

doi:10.1134/s1063784206020137

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…Self-propagating High-temperature Synthesis (SHS) has received considerable attention since it is a relatively simple, fast, low-cost, and efficient novel material production method 41 . It has also been used to produce certain advanced ceramic, composites, intermetallic compounds and carbon nano-tube 42 43 44 . As an alternative to conventional furnace technology, SHS is usually meant an exothermal reaction caused by a short thermal pulse (ignition) and then propagates due to intense heat release and heat transfer from hot to cold parts, forming a combustion wave.…”

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confidence: 99%

Magnetic properties of N-doped graphene with high Curie temperature

Miao

Wang

Liu

et al. 2016

Sci Rep

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N-doped graphene with Curie temperature higher than room temperature is a good candidate for nanomagnetic applications. Here we report a kind of N-doped graphene that exhibits ferromagnetic property with high Curie temperature (>600 K). Four graphene samples were prepared through self-propagating high-temperature synthesis (SHS), and the doped nitrogen contents of in the samples were 0 at.%, 2.53 at.%, 9.21 at.% and 11.17 at.%. It has been found that the saturation magnetization and coercive field increase with the increasing of nitrogen contents in the samples. For the sample with the highest nitrogen content, the saturation magnetizations reach 0.282 emu/g at 10 K and 0.148 emu/g at 300 K; the coercive forces reach 544.2 Oe at 10 K and 168.8 Oe at 300 K. The drop of magnetic susceptibility at ~625 K for N-doped graphene is mainly caused by the decomposition of pyrrolic N and pydinic N. Our results suggest that SHS method is an effective and high-throughput method to produce N-doped graphene with high nitrogen concentration and that N-doped graphene produced by SHS method is promising to be a good candidate for nanomagnetic applications.

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confidence: 99%

Magnetic properties of N-doped graphene with high Curie temperature

Miao

Wang

Liu

et al. 2016

Sci Rep

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“…To avoid such a disastrous side effect, the fast, hightemperature stage of the carbon layer must be followed by a rapid cooling down. Apart from the Huffman-Krätschmer arc process [18], SHS reactions are a promising way to produce such hetero-structures [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. Among the other possible synthesis processes, one could also cite RF plasma torch [36], magnetron and ion beam co-sputtering [37], high temperature annealing of the mixtures of carbon-based materials and metal containing powders [38], catalytic carbonization process [39,40,41], and laser induced pyrolysis [42].The very idea of encapsulating metals or metal carbides inside nanotubes or fullerene-like structures partly comes from the very specific magnetic properties in the nanoscale range, the carbon layer ensuring the particles to be stable, resistant, harmless, with many possible industrial applications [21] Experiment SHS process in PTFE /NaN 3 /Fe(CO) 5 systems…”

Section: Nanoscience and Technology: Open Accessmentioning

confidence: 99%

“…The purification procedures have to remove simple inorganic salts, such as fluorides. In order to remove these salts it is necessary to anneal the combustion reaction products for 6 hr in 50% nitric acid HNO 3 at 323K, and then to flush by distilled water until complete removal of the acid is achieved [33].…”

Section: Purification Procedures For Combustion Productsmentioning

confidence: 99%

Processing and Properties of Nanocarbon Reinforced Iron Nanocomposites by Self-Catalytic Propagation High- Temperature Synthesis for Cancer Therapy

Bendjemil¹,

Messadi²,

Lankar³

et al. 2015

NSTOA

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Nanoscience & Technology: Open AccessOpen Access Research Article difficult to synthesize on metals, as carbon would dissolve into the metal as a solid solution, or, at higher concentration, produce carbides. To avoid such a disastrous side effect, the fast, hightemperature stage of the carbon layer must be followed by a rapid cooling down. Apart from the Huffman-Krätschmer arc process [18], SHS reactions are a promising way to produce such hetero-structures [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. Among the other possible synthesis processes, one could also cite RF plasma torch [36], magnetron and ion beam co-sputtering [37], high temperature annealing of the mixtures of carbon-based materials and metal containing powders [38], catalytic carbonization process [39,40,41], and laser induced pyrolysis [42].The very idea of encapsulating metals or metal carbides inside nanotubes or fullerene-like structures partly comes from the very specific magnetic properties in the nanoscale range, the carbon layer ensuring the particles to be stable, resistant, harmless, with many possible industrial applications [21] Experiment SHS process in PTFE /NaN 3 /Fe(CO) 5 systemsAs a source of carbon, Teflon (PTFE from Sigma-Aldrich, purity >99%, CaCO 3 from Sigma-Aldrich, >99%) were reduced using NaN 3 powder (Sigma-Aldrich, >99%). The blends were prepared in a high energy Fritsch planetary ball mill (Pulverisette 6) using a rotation speed within the range 400-600 rpm for a duration of 30-45 min to assure high homogenization, fractioning, and cold welding of the particles. In order to avoid oxidation during alloying, the ball mill was filled with high purity argon gas. The powders were then mixed with Fe(CO) 5 powders (-325 mesh), used as catalysts and not compacted. Finally, reactions were carried out under reactive (air) or neutral atmosphere (argon) in a high-pressure reactor, in the self-propagating High-temperature Synthesis (SHS) mode (Figure 1), at an initial AbstractCombustion synthesis in a self-catalytic propagation Hightemperature Synthesis mode was used with the aim to synthesize 1D carbon nanostructures, by the sodium Azide NaN 3 reduction of the Teflon PTFE (CF)n, either in argon or in air, at ambient pressure (0.1 MPa) or at 1 MPa. In the same time, several possible catalysts were tried, such as Fe(CO) 5 , Co(CO) 5 , Ni (CO) 5 powders. Through the presence of NaF in the product, the deep reduction of PTFE is shown. In order to produce fullerenes and carbon nanotubes, On the other hand, we obtain nanocarbon reinforced iron nano-composites by nanocarbon encapsulated iron metal nanoparticles in nanocarbon coke were obtained in our samples with high yield, opening the process to new possible and nanobiomedical applications.

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“…4f, g, h). (g) [40] (h) [40] (m) (n) In fact, Huczko et al [26] and Alekseev et al [36] have shown that condensing carbon vapors by combustion of carbonates (produced via SHS) can yield CNTs. Also, Bendjemil et al [37,38] reported on production of carbon nanotubes upon gas combustion (decomposition of Fe(CO) 5 at low pressures and moderate temperatures, one should mention that CO 2 ), which is in fact, an intermediate reactant of our carbonate decomposition under combustion synthesis conditions, can be reduced to CNTs by metallic Li [39].…”

Section: Pharmacological Molecule Based On Nanocarbon Container Encapsulatedmentioning

confidence: 99%

Pharmacological Molecule Based on Nanocarbon Container Encapsulated Ferromagnet by Combustion Synthesis for Cancer Therapy

Bendjemil¹,

Lankar²,

Messadi³

et al. 2014

ujc

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Combustion synthesis in electrothermal explosion mode can be regarded as an efficient method to obtain new nanomaterials. Different starting mixtures of magnesium powder with various carbonates (Li 2 CO 3 , Na 2 CO 3 , CaCO 3 , FeCO 3 , (NH 4 ) 2 CO 3 ) were tried and the self-thermal reactions were carried out under both reactive (air) and neutral atmosphere (argon) with an initial pressure of 10 atm to yield novel nanomaterials. Fe, Co, Ni, Pd, Nd, Ta, Ti, Nb, W and NiO powders were used as catalysts and their synthesis and purification have been optimized. Under the applied conditions the presence of crystalline MgO and NaO 2 in products confirmed by XRD analysis, even for the reaction under neutral atmosphere, points to the deep conversion of carbonates. For producing fibrous products the Na 2 CO 3 system proved to be the most promising one. FESEM images show the morphology of the products with some 1-D nanostructures resembling carbon nanotubes and nanosized metal/carbon composite (carbon-encapsulated metal-based iron nanoparticles with a core-shell structure with interesting magnetic properties by combustion was obtained. Different magnetic metals (Fe, Ni, and Co) that can be encapsulated by the carbon shell, graphite layers and nanofibers. After purification procedure, we will only obtain core-shell or graphite layers encapsulated by metal magnetic nanoparticles without impurity like noncoated iron or carbides and amorphous carbon. The characterization techniques include the chemical analysis, HRTEM, XRD and FESEM.. The obtained novel pharmacological molecular nanostructure will be injected in the cancer tumor cell (prostate) after sterilization. The nanocontainer will be heated by microwave at the Laboratory Central of Anatomie and Cytology Pathology of the CHU Annaba. The reaction will be observed in the HRTEM.

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Production of carbon nanotubes by self-propagating high-temperature synthesis

Cited by 5 publications

References 11 publications

Magnetic properties of N-doped graphene with high Curie temperature

Magnetic properties of N-doped graphene with high Curie temperature

Processing and Properties of Nanocarbon Reinforced Iron Nanocomposites by Self-Catalytic Propagation High- Temperature Synthesis for Cancer Therapy

Pharmacological Molecule Based on Nanocarbon Container Encapsulated Ferromagnet by Combustion Synthesis for Cancer Therapy

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