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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, p. 445703 [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
2012 Impact Factor: 3.842
2012 SCImago Journal Rankings: 1.474
 
DOIhttp://dx.doi.org/10.1088/0957-4484/18/44/445703
 
ISI Accession Number IDWOS:000250138500023
 
ReferencesReferences in Scopus
 
DC FieldValue
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, p. 445703 [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.epage445703
 
dc.identifier.hkuros147631
 
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dc.identifier.isiWOS:000250138500023
 
dc.identifier.issn0957-4484
2012 Impact Factor: 3.842
2012 SCImago Journal Rankings: 1.474
 
dc.identifier.issue44
 
dc.identifier.openurl
 
dc.identifier.scopuseid_2-s2.0-36048935070
 
dc.identifier.spage445703
 
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
 
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<description.abstract>Using 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. &#169; IOP Publishing Ltd.</description.abstract>
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Author Affiliations
  1. The University of Hong Kong
  2. University of California, Riverside
  3. University of Arizona
  4. Raytheon