The oscillatory characteristics of a 2C 60/CNT oscillator system

Xiaohong Wang, Hao Xin, Jon N. Leonard, GuanHua Chen, Allen T. Chwang, Qing Jiang

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The authors have studied, using molecular dynamic (MD) simulations, the oscillatory characteristics of a 2C 60/CNT oscillator system, in which two C 60 fullerenes oscillate inside a single walled carbon nanotube (CNT) in two basic modes, i.e., the symmetric and non-symmetric motions. In the symmetric mode, with each oscillation the two fullerenes move symmetrically from the CNT ends towards the CNT center where they bounce off each other and head back towards the ends. In the non-symmetric mode, the two fullerenes move back and forth inside the CNT crossing the center point of the CNT together with each oscillation. The simulations show that the non-symmetric oscillation mode is stable for the prescribed initial (maximum) velocities up to 300 m/s, while the symmetric oscillation mode however, experiences dynamic instabilities for a prescribed initial (maximum) velocity larger than 250 m/s. The instability takes place as a result of the transfer of energy from the translational to the rotational motion of the fullerenes. This characteristic differentiates 2C 60/CNT oscillators from double-walled CNT oscillators. The rotation is primarily caused by the inter-colliding of the two fullerenes, which subjects the fullerenes to large van der Waals repelling forces. These repelling forces are not necessarily aligned perfectly along the CNT axis nor precisely pointing towards the mass centers of the fullerenes. These misalignments cause the fullerenes to rock around the CNT's axis, while their offsets from the mass centers cause the fullerenes to rotate. The rocking motion, being severely confined by the CNT, does not gain much energy itself, but instead, channels energy from translational to rotational motion. The energy channeling is found to be reversed in some very short time intervals, but the rotational motion always gains energies from the translational motion over a time interval that is long enough at the MD time scale. This feature, contrary to our experiences in the macroscopic world, appears to be unique for such nanoscopic mechanical systems.

Original languageEnglish (US)
Pages (from-to)1512-1517
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Volume7
Issue number4-5
DOIs
StatePublished - Apr 2007

Fingerprint

Carbon Nanotubes
Fullerenes
Carbon nanotubes
Molecular Dynamics Simulation
Molecular dynamics
Van der Waals forces
Single-walled carbon nanotubes (SWCN)
Energy Transfer
Rocks
Head
Carbon
Computer simulation

Keywords

  • Carbon nanotube
  • Energy dissipation
  • Fullerene
  • GHz oscillator
  • MD simulations
  • Nano system

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Materials Science (miscellaneous)
  • Engineering (miscellaneous)

Cite this

The oscillatory characteristics of a 2C 60/CNT oscillator system. / Wang, Xiaohong; Xin, Hao; Leonard, Jon N.; Chen, GuanHua; Chwang, Allen T.; Jiang, Qing.

In: Journal of Nanoscience and Nanotechnology, Vol. 7, No. 4-5, 04.2007, p. 1512-1517.

Research output: Contribution to journalArticle

Wang, Xiaohong ; Xin, Hao ; Leonard, Jon N. ; Chen, GuanHua ; Chwang, Allen T. ; Jiang, Qing. / The oscillatory characteristics of a 2C 60/CNT oscillator system. In: Journal of Nanoscience and Nanotechnology. 2007 ; Vol. 7, No. 4-5. pp. 1512-1517.
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AB - The authors have studied, using molecular dynamic (MD) simulations, the oscillatory characteristics of a 2C 60/CNT oscillator system, in which two C 60 fullerenes oscillate inside a single walled carbon nanotube (CNT) in two basic modes, i.e., the symmetric and non-symmetric motions. In the symmetric mode, with each oscillation the two fullerenes move symmetrically from the CNT ends towards the CNT center where they bounce off each other and head back towards the ends. In the non-symmetric mode, the two fullerenes move back and forth inside the CNT crossing the center point of the CNT together with each oscillation. The simulations show that the non-symmetric oscillation mode is stable for the prescribed initial (maximum) velocities up to 300 m/s, while the symmetric oscillation mode however, experiences dynamic instabilities for a prescribed initial (maximum) velocity larger than 250 m/s. The instability takes place as a result of the transfer of energy from the translational to the rotational motion of the fullerenes. This characteristic differentiates 2C 60/CNT oscillators from double-walled CNT oscillators. The rotation is primarily caused by the inter-colliding of the two fullerenes, which subjects the fullerenes to large van der Waals repelling forces. These repelling forces are not necessarily aligned perfectly along the CNT axis nor precisely pointing towards the mass centers of the fullerenes. These misalignments cause the fullerenes to rock around the CNT's axis, while their offsets from the mass centers cause the fullerenes to rotate. The rocking motion, being severely confined by the CNT, does not gain much energy itself, but instead, channels energy from translational to rotational motion. The energy channeling is found to be reversed in some very short time intervals, but the rotational motion always gains energies from the translational motion over a time interval that is long enough at the MD time scale. This feature, contrary to our experiences in the macroscopic world, appears to be unique for such nanoscopic mechanical systems.

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