Article: Ultra-fast oscillation of cobalt clusters encapsulated inside carbon nanotubes

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TitleUltra-fast oscillation of cobalt clusters encapsulated inside carbon nanotubes
AuthorsWang, X2
Xin, H3
Leonard, JN4
Chen, G1
Jiang, Q2
Issue Date2007
PublisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/journals/nano
CitationNanotechnology, 2007, v. 18 n. 44 [How to Cite?]
DOI: http://dx.doi.org/10.1088/0957-4484/18/44/445703
AbstractUsing molecular dynamics (MD) simulations, the authors have studied the oscillatory characteristics of the 2Co@CNT oscillator systems. Each of these oscillator systems consists of a hosting carbon nanotube (CNT) and two encapsulated cobalt (Co) clusters, and oscillations are initiated by prescribing an initial kinetic energy to each of the two cobalt clusters. The non-symmetric oscillation mode, in which the two cobalt clusters always move towards the same direction, was found to be stable over a wide range of initial energy. However, the symmetric oscillation mode, in which the two cobalt clusters move towards or away from each other, bouncing off each other in each oscillation, is stable only when the initial kinetic energies are lower than a threshold value. Above this threshold, the oscillation becomes increasingly unstable with the increasing initial kinetic energy. The instability is found to take place through transferring energy from the translational motion to the rotational motion of the cobalt clusters, due to the fact that the impact of the cluster-cluster collisions can be slightly off-center, causing the clusters to roll and rock. The rocking motion of the cobalt clusters serves as the channel for the energy transfer. The rocking motion can be retarded and may even be eliminated by reducing the hosting CNT diameter. But a smaller hosting CNT does not always lead to more stable translational oscillation. There apparently exists an optimal CNT for a given size of clusters for stabilizing the translational oscillation. A hosting CNT that is too much smaller than optimum causes severe cobalt-carbon atomic interactions, which lead to losses of energy from the ordered translational motion of clusters to disordered thermal motions of the atoms. © IOP Publishing Ltd.
ISSN0957-4484
2011 Impact Factor: 3.979
2011 SCImago Journal Rankings: 0.266
DOIhttp://dx.doi.org/10.1088/0957-4484/18/44/445703
ISI Accession Number IDWOS:000250138500023
ReferencesReferences in Scopus
DC Field
Value
dc.contributor.authorWang, X
dc.contributor.authorXin, H
dc.contributor.authorLeonard, JN
dc.contributor.authorChen, G
dc.contributor.authorJiang, Q
dc.date.accessioned2010-09-06T06:13:47Z
dc.date.available2010-09-06T06:13:47Z
dc.date.issued2007
dc.description.abstractUsing molecular dynamics (MD) simulations, the authors have studied the oscillatory characteristics of the 2Co@CNT oscillator systems. Each of these oscillator systems consists of a hosting carbon nanotube (CNT) and two encapsulated cobalt (Co) clusters, and oscillations are initiated by prescribing an initial kinetic energy to each of the two cobalt clusters. The non-symmetric oscillation mode, in which the two cobalt clusters always move towards the same direction, was found to be stable over a wide range of initial energy. However, the symmetric oscillation mode, in which the two cobalt clusters move towards or away from each other, bouncing off each other in each oscillation, is stable only when the initial kinetic energies are lower than a threshold value. Above this threshold, the oscillation becomes increasingly unstable with the increasing initial kinetic energy. The instability is found to take place through transferring energy from the translational motion to the rotational motion of the cobalt clusters, due to the fact that the impact of the cluster-cluster collisions can be slightly off-center, causing the clusters to roll and rock. The rocking motion of the cobalt clusters serves as the channel for the energy transfer. The rocking motion can be retarded and may even be eliminated by reducing the hosting CNT diameter. But a smaller hosting CNT does not always lead to more stable translational oscillation. There apparently exists an optimal CNT for a given size of clusters for stabilizing the translational oscillation. A hosting CNT that is too much smaller than optimum causes severe cobalt-carbon atomic interactions, which lead to losses of energy from the ordered translational motion of clusters to disordered thermal motions of the atoms. © IOP Publishing Ltd.
dc.description.natureLink_to_subscribed_fulltext
dc.identifier.citationNanotechnology, 2007, v. 18 n. 44 [How to Cite?]
DOI: http://dx.doi.org/10.1088/0957-4484/18/44/445703
dc.identifier.doihttp://dx.doi.org/10.1088/0957-4484/18/44/445703
dc.identifier.hkuros147631
dc.identifier.isiWOS:000250138500023
dc.identifier.issn0957-4484
2011 Impact Factor: 3.979
2011 SCImago Journal Rankings: 0.266
dc.identifier.issue44
dc.identifier.openurl
dc.identifier.scopuseid_2-s2.0-36048935070
dc.identifier.urihttp://hdl.handle.net/10722/69451
dc.identifier.volume18
dc.languageeng
dc.publisherInstitute of Physics Publishing. The Journal's web site is located at http://www.iop.org/journals/nano
dc.publisher.placeUnited Kingdom
dc.relation.ispartofNanotechnology
dc.relation.referencesReferences in Scopus
dc.titleUltra-fast oscillation of cobalt clusters encapsulated inside carbon nanotubes
dc.typeArticle
Author Affiliations
  1. The University of Hong Kong
  2. University of California, Riverside
  3. University of Arizona
  4. Raytheon