3D CNT macrostructure synthesis catalyzed by MgFe2O4 nanoparticles—A study of surface area and spinel inversion influence

Zampiva, Rúbia Young Sun; Kaufmann, Claudir Gabriel; Schorne-Pinto, Juliano; Panta, Priscila Chaves; Alves, Annelise Kopp; Bergmann, Carlos Pérez

doi:10.1016/j.apsusc.2017.06.020

Cited by 28 publications

(14 citation statements)

References 60 publications

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“…The production of CNTs by EA using catalysts follows the classic model of nucleation; which starts from the carbon sublimation and the coalescence of catalyst particles 26,40 . According to the results, this might be the main route for the production of CNTs using 6BP.…”

Section: Resultsmentioning

confidence: 87%

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Ecofriendly synthesis of MWCNTs by electric arc in aqueous medium: Comparative study of 6B pencil and mineral graphite

Kaufmann

Zampiva

Arcaro

et al. 2020

Int J Applied Ceramic Tech

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The production of carbon nanotubes (CNTs) by electric arc discharge (EA) usually applies pure mineral graphite (PMG) as the precursor electrode due to its high‐purity and conductivity. This work investigated the versatility of EA in aqueous medium for the production of CNTs by varying the electrodes purity degree. In this way, a variety of domestic and industrial graphite waste can be recycled into high‐quality CNTs by adjusting the EA parameters. CNTs were synthesized using 6B pencil (6BP, ~57% graphite) and their quality and quantity were compared to the PMG (99.995%) production. PMG led to short CNTs (ID/IG 0.266), while the synthesis with 6BP led to long CNTs (ID/IG 0.428). The 6BP CNTs showed elevated quality for application in the electronic, biomedical, and optical fields.

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Section: Resultsmentioning

confidence: 87%

“…Metal ions are known for assisting in the nucleation of carbon atoms during the CNTs production 26,43 . Thereby, the use of MgFe 2 O 4 as a catalyst in the 6BP synthesis greatly improved the production yield and the quality of the tubes as indicated by sample P8.…”

Section: Resultsmentioning

confidence: 99%

Ecofriendly synthesis of MWCNTs by electric arc in aqueous medium: Comparative study of 6B pencil and mineral graphite

Kaufmann

Zampiva

Arcaro

et al. 2020

Int J Applied Ceramic Tech

Self Cite

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“…In addition to the MgFe 2 O 4 peaks, the samples produced with PEG (AP1, AP2, and AP3) show a small peak at 44.61º related to periclase formation (MgO, JCPDS 07-0239). All samples presented a 111 peak related to the degree of spinel inversion [45]. A higher intensity of this peak compared to the [311] peak indicates a higher degree of spinel inversion [45].…”

Section: Resultsmentioning

confidence: 97%

“…All samples presented a 111 peak related to the degree of spinel inversion [45]. A higher intensity of this peak compared to the [311] peak indicates a higher degree of spinel inversion [45]. Figure 3 presents the difference in intensity between the [111] and [311] peaks.…”

Section: Resultsmentioning

confidence: 99%

Influence of the fuel composition and the fuel/oxidizer ratio on the combustion solution synthesis of MgFe2O4 catalyst nanoparticles

Sun¹,

Kaufmann²,

Alves³

et al. 2018

FME Transactions

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Solution combustion synthesis (SCS) has been widely applied to produce oxide catalysts due to the possibility of producing highly pure and homogeneous nanostructured powders at low cost. The smaller the particles are and the higher the surface area is, the more efficient the powder catalyst will be. For iron-based catalysts such as ferrites, the degree of spinel inversion is another factor that affects the catalyst activity. In SCS, the particle size, surface area, and degree of spinel inversion are fundamentally related to process variables such as the fuel composition and the fuel/oxidizer ratio. Therefore, we studied the application of glycine and polyethylene glycol-200 molecular weight (PEG 200) as fuels and the influence of the fuel/oxidizer ratio in the SCS of MgFe 2 O 4 catalyst nanoparticles. The products' morphology and composition were systematically characterized by X-ray diffraction, microscopy analyses, and specific surface area. The results indicate the production of high-purity nanoparticles with increased surface area, which was obtained with low concentrations of glycine and a wide range of particle sizes that depend on the fuel composition and concentration.

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“…The manipulation of CNTs has resulted in a series of studies in the areas of health, computing, physics, chemistry, and materials. To produce CNTs, the most common methods are: chemical vapor deposition (CVD) [12], combustion [13], laser ablation [14], and electric arc [15,16]. The CVD method produces CNTs based on the deposition of carbon precursor gases, while the combustion method is based on the combustion of carbon precursor gases.…”

Section: Introductionmentioning

confidence: 99%

Production of multi-wall carbon nanotubes starting from a commercial graphite pencil using an electric arc discharge in aqueous medium

Kaufmann¹,

Sun²,

Bergmann³

et al. 2018

FME Transaction

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Carbon nanotubes (CNTs) are studied because of their diverse applications in many fields, such as medicine, computing, physics, chemistry, and others. Therefore, it is crucial to develop techniques for producing a large volume of high-quality multi-wall carbon nanotubes (MWCNTs) with the best cost-to-benefit ratio. In this paper, we obtain MWCNTs via an arc-electric alternative route, which dispenses catalysts and sealed cameras using water as an insulating medium. This method is simple, cost-effective (starting from pieces of commercial graphite pencil), efficient, and highly reproducible. Since no catalysts are used, no purification post-treatment was necessary, leading to high-quality MWCNTs. This technique is very promising for industrial applications because a lot of high-quality MWCNTs could be easily produced in a short time.

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3D CNT macrostructure synthesis catalyzed by MgFe2O4 nanoparticles—A study of surface area and spinel inversion influence

Cited by 28 publications

References 60 publications

Ecofriendly synthesis of MWCNTs by electric arc in aqueous medium: Comparative study of 6B pencil and mineral graphite

Ecofriendly synthesis of MWCNTs by electric arc in aqueous medium: Comparative study of 6B pencil and mineral graphite

Influence of the fuel composition and the fuel/oxidizer ratio on the combustion solution synthesis of MgFe2O4 catalyst nanoparticles

Production of multi-wall carbon nanotubes starting from a commercial graphite pencil using an electric arc discharge in aqueous medium

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