Shear and friction between carbon nanotubes in bundles and yarns

Jeffrey T. Paci, Al'Ona Furmanchuk, Horacio D. Espinosa, George C Schatz

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We perform a detailed density functional theory assessment of the factors that determine shear interactions between carbon nanotubes (CNTs) within bundles and in related CNT and graphene structures including yarns, providing an explanation for the shear force measured in recent experiments (Filleter, T.etal. Nano Lett. 2012, 12, 732). The potential energy barriers separating AB stacked structures are found to be irrelevant to the shear analysis for bundles and yarns due to turbostratic stacking, and as a result, the tube-tube shear strength for pristine CNTs is estimated to be -5 Torr). Such defects and groups are estimated to involve 0.55 eV interaction energies on average, which is much larger than single-atom vacancy defects (approximately 0.039 eV). Furthermore, because graphitic materials are stiff they have large coherence lengths, and this means that push-pull effects result in force cancellation for vacancy and other defects that are internal to the CNTs. Another important factor is the softness of cantilever structures relative to the stiff CNTs in the experiments, as this contributes to elastic instability transitions that account for significant dissipation during shear that has been observed. The application of these results to the mechanical behavior of yarns is discussed, providing general guidelines for the manufacture of strong yarns composed of CNTs.

Original languageEnglish
Pages (from-to)6138-6147
Number of pages10
JournalNano Letters
Volume14
Issue number11
DOIs
Publication statusPublished - Nov 12 2014

Fingerprint

yarns
Carbon Nanotubes
bundles
Yarn
Carbon nanotubes
friction
carbon nanotubes
Friction
shear
Defects
Vacancies
defects
tubes
softness
Graphite
Energy barriers
shear strength
Potential energy
Shear strength
cancellation

Keywords

  • carbon nanotube fracture
  • carbon nanotube friction
  • Carbon nanotube shear
  • high performance yarn
  • quantum mechanical modeling
  • super lubrication

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Shear and friction between carbon nanotubes in bundles and yarns. / Paci, Jeffrey T.; Furmanchuk, Al'Ona; Espinosa, Horacio D.; Schatz, George C.

In: Nano Letters, Vol. 14, No. 11, 12.11.2014, p. 6138-6147.

Research output: Contribution to journalArticle

Paci, JT, Furmanchuk, AO, Espinosa, HD & Schatz, GC 2014, 'Shear and friction between carbon nanotubes in bundles and yarns', Nano Letters, vol. 14, no. 11, pp. 6138-6147. https://doi.org/10.1021/nl502210r
Paci, Jeffrey T. ; Furmanchuk, Al'Ona ; Espinosa, Horacio D. ; Schatz, George C. / Shear and friction between carbon nanotubes in bundles and yarns. In: Nano Letters. 2014 ; Vol. 14, No. 11. pp. 6138-6147.
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