Ball milling effect on the structure of single-wall carbon nanotubes

Piérard, Nathalie; Fonseca, A.; Colomer, Jean-François; Bossuot, Christophe; Benoit, Jean‐Michel; Tendeloo, Gustaaf Van; Pirard, Jean‐Paul; Nagy, J.B.

doi:10.1016/j.carbon.2004.02.031

Cited by 165 publications

(94 citation statements)

References 24 publications

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“…The multi-walled carbon nanotubes (MWCNT) combined to magnesium hydride MgH 2 can be seen . Since ball milling can be detrimental to some catalysts such as carbon nanotubes 12 , it was performed for only 20 min. Although a thorough investigation on ball milling conditions is still needed, for the present research, the fact that the MWCNT appear as their original morphology on the SEM image is an interesting finding.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen Uptake Enhancement by the Use of a Magnesium Hydride and Carbon Nanotubes Mixture

et al. 2017

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Studies show that the carbon nanotubes (CNTs) serve as hydrogen diffusion channels, when used with magnesium hydride. The hydrogen sorption study, of a MgH 2 and 5wt% of multiwalled carbon nanotubes mixture, was the main purpose of this work. The samples were analyzed by means of X-ray diffraction (XRD) and also studied in a differential scanning calorimeter (DSC). The carbon nanotubes, that were ball milled during 20 min to the MgH 2, were observed in the scanning electron microscopy (SEM) images. The mixture of MgH 2 -CNT turned out to enhance the hydrogen sorption when compared to pure MgH 2 and in 5 min it desorbed around 5 wt% of hydrogen, at 350 o C and 0.1 bar.

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Section: Resultsmentioning

confidence: 99%

Hydrogen Uptake Enhancement by the Use of a Magnesium Hydride and Carbon Nanotubes Mixture

et al. 2017

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“…However, ball milling is known to degrade fragile carbon nanostructures (15,16)and is known to introduce Fe contamination from the ball mill vial and/or balls (17,18), and Fe is an excellent catalyst for dehydrogenation of NaAlH 4 (19). When studying carbon materials as catalysts for NaAlH 4 , care must be taken in the preparation of samples.…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanomaterials as Catalysts for Hydrogen Uptake and Release in NaAlH₄

et al. 2009

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Abstract:A synergistic approach involving experiment and first-principles theory not only shows that carbon nanostructures can be used as catalysts for hydrogen uptake and release in complex metal hydrides such as sodium alanate, NaAlH 4 , but also provides an unambiguous understanding of how the catalysts work. The stability of NaAlH 4 originates from the charge transfer from Na to the AlH 4 moiety, resulting in an ionic bond between Na + and AlH 4 -and a covalent bond between Al and H. Interaction of NaAlH 4 with an electro-negative substrate such as carbon fullerene or nanotube affects the ability of Na to donate its charge to AlH 4 , consequently weakening the Al-H bond and causing hydrogen to desorb at lower temperatures as well as facilitating the absorption of H 2 to reverse the dehydrogenation reaction. Ab initio molecular dynamics simulation further reveals the time evolution of the charge transfer process with hydrogen desorption occurring when the charge transfer is complete. Introduction:

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“…Pierard et.al. have evaluated the effect of grinding on the structure of single walled carbon nanotubes using a ball mill and found the decreased length of CNTs and increased surface area which is a primary and necessary condition for heterogeneous catalytic supports [81]. Welham et.al.…”

Section: Modification Through Ball Millingmentioning

confidence: 99%