Preparation and growth mechanism of carbon nanotubes via catalytic pyrolysis of phenol resin

Zhu, Bin; Wei, Guoping; Li, X. C.; Ma, Zheng; Wei, Ying

doi:10.1179/1433075x13y.0000000125

Cited by 29 publications

(6 citation statements)

References 31 publications

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“…Thus, the product with Ni(NO 3 ) 2 ·6H 2 O formed multidimensional micro/nano-sized carbon structures with platelet, glassy, and tube-like morphologies. Such a multidimensional carbon structure could provide for an excellent performance in LCCR applications [34,35].…”

Section: Resultsmentioning

confidence: 99%

Micro-Nano Carbon Structures with Platelet, Glassy and Tube-Like Morphologies

et al. 2019

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Carbon source precursors for high-grade, clean, and low-carbon refractories were obtained by in situ exfoliation of flake graphite (FG) and phenol–formaldehyde resin (PF) composites with three-roll milling (TRM) for the fabrication of graphite nanoplatelets. In addition, by using Ni(NO3)2·6H2O as a catalyst in the pyrolysis process, multidimensional carbon nanostructures were obtained with coexisting graphite nanoplatelets (GNPs), glassy carbon (GC), and carbon nanotubes (CNTs). The resulting GNPs (exfoliated 16 times) had sizes of 10–30 μm, thicknesses of 30–50 nm, and could be uniformly dispersed in GC from the PF pyrolysis. Moreover, Ni(NO3)2·6H2O played a key role in the formation and growth of CNTs from a catalytic pyrolysis of partial PF with the V–S/tip growth mechanisms. The resulting multidimensional carbon nanostructures with GNPs/GC/CNTs are attributed to the shear force of the TRM process, pyrolysis, and catalytic action of nitrates. This method reduced the production costs of carbon source precursors for low-carbon refractories, and the precursors exhibited excellent performances when fabricated on large scales.

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Section: Resultsmentioning

confidence: 99%

Micro-Nano Carbon Structures with Platelet, Glassy and Tube-Like Morphologies

et al. 2019

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“…The carbon content of samples containing the catalyst was higher than N0 sample, because a role was played by Ni on carbon fixation during the pyrolysis of organic precursor. 24 Ni(NO 3 ) 2 ⋅6H 2 O underwent complete decomposition to form NiO at 330 • C. 25 NiO could be reduced into nano-Ni directly by reacting with C and CO 26 generating from the thermal decomposition of citric acid and magnesium citrate, 17 such as in Equations ( 1) and (2). Therefore, a higher catalyst content reduced the carbon content:…”

Section: 1mentioning

confidence: 99%

Enhanced thermal shock resistance of low‐carbon Al₂O₃‐C refractories via CNTs/MgAl₂O₄ whiskers composite reinforcement

Feng,

Xiao,

Ding

et al. 2024

J Am Ceram Soc.

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The CNTs/MgAl2O4 whiskers composite reinforcement was prepared by catalytic carbon‐bed sintering and added to low‐carbon Al2O3‐C refractories to enhance the thermal shock resistance of refractories. The effects of Ni(NO3)2·6H2O content on the phase and microstructure of CNTs/MgAl2O4 were investigated. The nano‐indentation technology was used to quantitatively evaluate the effect of CNTs/MgAl2O4 on the thermal shock resistance of low‐carbon Al2O3‐C refractories, and the toughening mechanism of CNTs/MgAl2O4 on refractories was further investigated. The results revealed that the inner and outer diameters of the CNTs were approximately 5.69 and 16.26 nm, respectively. The CNTs winded around interlocking structural MgAl2O4 whiskers with a high aspect ratio (>100), which was beneficial to the dispersion of CNTs in the refractory matrix. The thermal shock resistance of low‐carbon Al2O3‐C refractories was significantly improved by adding 3.0 wt.% of CNTs/MgAl2O4 (named C3). The specific fracture energy of refractory matrix and residual strength ratio of C3 reached 141 N·m−1 and 39.2%, which were 29.4% and 97.0% higher than those of the blank sample (109 N·m−1 and 19.9%), respectively. This is because the refractory matrix was significantly reinforced by CNTs and MgAl2O4 whiskers, promoting the occurrence of “bridging” and “crack deflection” and the generation of microcracks in the refractory matrix.

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“…1-Dimensional nanomaterials such as nanowires and nanotubes have been intensively studied during past decades due to their outstanding properties due to their low dimensionality [1][2][3][4][5][6][7]. Based on their properties, the nanomaterials have been considered and explored as the potential materials of future applications in integrated electronic, optoelectronic, bio-sensing, and photonic devices [2,3,[5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%