Scaled-up process for producing longer carbon nanotubes and carbon cotton by macro-spools

Мордкович, В. З.; Kazennov, Nikita V.; Ermolaev, V. S.; Zhukova, Ekaterina A.; Karaeva, Aida R.

doi:10.1016/j.diamond.2018.01.017

Cited by 19 publications

(20 citation statements)

References 23 publications

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“…The results shown in Table 2 are remarkable by the fact that almost all the CNT were received mainly in the form of an aerogel “stocking”. A “stocking” aka “sprout” is a semi-transparent hollow cylinder, which appears in the bottom section of the reactor and grows up through the reactor reaching the top and then getting deposited in the receiving chamber as described in detail elsewhere [ 16 ]. Only in the case of using 100% nickelocene and the ratio of mixtures of metallocenes Fe:Ni and Fe:Co equal to 25:75 (i.e., in case of great excess of nickelocene or cobaltocene) entangled threads (no appearance of a “stocking”, just short entangled thread-like collections of carbon material flying through the reactor and getting deposited in a receiving chamber) are obtained.…”

Section: Resultsmentioning

confidence: 99%

“… Schematic drawing of a laboratory reactor block for the synthesis of nanotubes with in situ winding: ( a ) top-down “Cambridge Process” [ 14 ]; and ( b ) bottom-up “Moscow Process” [ 16 ]. …”

Section: Figurementioning

confidence: 99%

“…The aerosol synthesis is known as being capable of producing a “flexible smoke” of millimeter-long [ 14 , 15 ] or even centimeter-long [ 16 , 17 ] CNTs of relatively small diameter, usually dominated by single-walled or double-walled tubes. In these publications, the method is based on the decomposition of a carbon precursor and the nucleation of carbon nanotubes on Fe nanoparticles in a hydrogen flow.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, Structure and Electrical Resistivity of Carbon Nanotubes Synthesized over Group VIII Metallocenes

et al. 2020

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The paper reports the synthesis of carbon nanotubes from ethanol over group VIII (Fe, Co, Ni) catalysts derived from corresponding metallocenes. Several unexpected cooperative effects are reported, which are never observed in the case of individual metallocenes such as the commonly used ferrocene catalyst Fe(C5H5)2. The formation of very long (up to several µm) straight monocrystal metal kernels inside the carbon nanotubes was the most interesting effect. The use of trimetal catalysts (Fe1-x-yCoxNiy)(C5H5)2 resulted in the sharp increase in the yield of carbon nanotubes. The electrical conductivity of the produced nanotubes is determined by the nature of the catalyst. The variation of individual metals in the Ni-Co-Fe leads to a drop of the electrical resistivity of nanotube samples by the order of magnitude, i.e., from 1.0 × 10−3 to 1.1 × 10−5 Ω∙m. A controlled change in the electrophysical properties of the nanotubes can make it possible to expand their use as fillers in composites, photothermal and tunable magnetic nanomaterials with pre-designed electrical conductivity and other electromagnetic properties.

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Section: Resultsmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis, Structure and Electrical Resistivity of Carbon Nanotubes Synthesized over Group VIII Metallocenes

et al. 2020

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“…CNT felt was used as a nanofiller of epoxy nanocomposites and was obtained by the method of float catalysis [ 9 ] on the pilot plant for producing CNTs ( Figure 1 ) at a temperature of 1150 °C in a stream of hydrogen from a mixture of ethanol, acetone and thiophene (activator) in mass ratio 1/1/0.03, respectively. Ferrocene was used as a precursor for the synthesis of CNT.…”

Section: Methodsmentioning

confidence: 99%

“…Another important observation is that CNT introduction leads to rapid loss of fluidity of uncured composition with the rising content of CNT. The CNTs reported recently as a product of our own version of FC-CVD [ 9 ] are characterized by outstanding nanotube length (superlong nanotubes) and domination of double-walled nanotubes. The observations of these nanotubes suggested that their interaction with epoxy compositions is different in many ways.…”

Section: Introductionmentioning

confidence: 99%

Epoxy Nanocomposites with Carbon Nanotubes Produced by Floating Catalyst CVD

et al. 2021

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Epoxy nanocomposites with float catalysis-produced CNT felt as a filler were prepared. Parameters such as the curing process, glass transition of epoxynanocomposites, structure and morphology of CNT felt, initial epoxy composition, and epoxy nanocomposites were investigated. The influence of CNT felt on curing process in epoxy nanocomposites with different amounts of curing agent was determined. An exothermic reaction between the curing agent and the surface of CNTs was established. It was found that the structure of epoxy nanocomposites has a high degree of heterogeneity: the presence of fiber-like structures and individualized CNTs is observed together with the regions that are typical for CNTs that are fabricated via a catalytic chemical vapor deposition (CVD). Based on the studies performed, it is possible to predict the production of epoxy nanocomposites with outstanding mechanical and thermophysical properties. In particular, the uncured compositions already obtained in this work can be used for the manufacture of electrically conductive glass and carbon fiber reinforced plastics and functional coatings.

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Carbon nanotube cloth as a promising electrode material for flexible aqueous supercapacitors

et al. 2022

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Scaled-up process for producing longer carbon nanotubes and carbon cotton by macro-spools

Cited by 19 publications

References 23 publications

Synthesis, Structure and Electrical Resistivity of Carbon Nanotubes Synthesized over Group VIII Metallocenes

Synthesis, Structure and Electrical Resistivity of Carbon Nanotubes Synthesized over Group VIII Metallocenes

Epoxy Nanocomposites with Carbon Nanotubes Produced by Floating Catalyst CVD

Carbon nanotube cloth as a promising electrode material for flexible aqueous supercapacitors

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