Acoustic energy dissipation and thermalization in carbon nanotubes: Atomistic modeling and mesoscopic description
The exchange of energy between low-frequency mechanical oscillations and high-frequency vibrational modes in carbon nanotubes (CNTs) is a process that plays an important role in a range of dynamic phenomena involving the dissipation of mechanical energy in both individual CNTs and CNT-based material...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2013
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| Online Access: | http://hdl.handle.net/1721.1/75858 https://orcid.org/0000-0002-9693-5219 |
| _version_ | 1826216313049055232 |
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| author | Nicholson, David A. Jacobs, William M. Zemer, Hagit Volkov, Alexey N. Zhigilei, Leonid V. |
| author2 | Massachusetts Institute of Technology. Department of Chemical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Chemical Engineering Nicholson, David A. Jacobs, William M. Zemer, Hagit Volkov, Alexey N. Zhigilei, Leonid V. |
| author_sort | Nicholson, David A. |
| collection | MIT |
| description | The exchange of energy between low-frequency mechanical oscillations and high-frequency vibrational modes in carbon nanotubes (CNTs) is a process that plays an important role in a range of dynamic phenomena involving the dissipation of mechanical energy in both individual CNTs and CNT-based materials. The rates and channels through which acoustic energy deposited instantaneously in individual CNTs is dissipated are investigated in a series of atomistic molecular dynamics simulations. Several distinct regimes of energy dissipation, dependent on the initial stretching or bending deformations, are established. The onset of axial or bending buckling marks the transition from a regime of slow thermalization to a regime in which the energy associated with longitudinal and bending oscillations is rapidly damped. In the case of stretching vibrations, an intermediate regime is revealed in which dynamic coupling between longitudinal vibrational modes and the radial “squash” mode causes delayed axial buckling followed by a rapid transfer of energy to high-frequency vibrations. The results of the atomistic simulations are used in the design and parameterization of a “heat bath” description of thermal energy in a mesoscopic model, which is capable of simulating systems consisting of thousands of interacting CNTs. Two complementary methods for the description of mechanical energy dissipation in the mesoscopic model are developed. The relatively slow dissipation of acoustic vibrations in the absence of buckling is described by adding a damping force to the equations of motion of the dynamic elements of the mesoscopic model. The sharp increase in the energy dissipation rate at the onset of buckling is reproduced by incorporating a hysteresis loop into the strain energy that accounts for localized thermalization in the vicinity of buckling kinks. The ability of the mesoscopic model to reproduce the complex multistep processes of acoustic energy dissipation predicted by the atomistic simulations is demonstrated in mesoscopic simulations of free stretching and bending vibrations of individual CNTs. |
| first_indexed | 2024-09-23T16:45:46Z |
| format | Article |
| id | mit-1721.1/75858 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:45:46Z |
| publishDate | 2013 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/758582022-10-03T08:05:56Z Acoustic energy dissipation and thermalization in carbon nanotubes: Atomistic modeling and mesoscopic description Nicholson, David A. Jacobs, William M. Zemer, Hagit Volkov, Alexey N. Zhigilei, Leonid V. Massachusetts Institute of Technology. Department of Chemical Engineering Nicholson, David A. The exchange of energy between low-frequency mechanical oscillations and high-frequency vibrational modes in carbon nanotubes (CNTs) is a process that plays an important role in a range of dynamic phenomena involving the dissipation of mechanical energy in both individual CNTs and CNT-based materials. The rates and channels through which acoustic energy deposited instantaneously in individual CNTs is dissipated are investigated in a series of atomistic molecular dynamics simulations. Several distinct regimes of energy dissipation, dependent on the initial stretching or bending deformations, are established. The onset of axial or bending buckling marks the transition from a regime of slow thermalization to a regime in which the energy associated with longitudinal and bending oscillations is rapidly damped. In the case of stretching vibrations, an intermediate regime is revealed in which dynamic coupling between longitudinal vibrational modes and the radial “squash” mode causes delayed axial buckling followed by a rapid transfer of energy to high-frequency vibrations. The results of the atomistic simulations are used in the design and parameterization of a “heat bath” description of thermal energy in a mesoscopic model, which is capable of simulating systems consisting of thousands of interacting CNTs. Two complementary methods for the description of mechanical energy dissipation in the mesoscopic model are developed. The relatively slow dissipation of acoustic vibrations in the absence of buckling is described by adding a damping force to the equations of motion of the dynamic elements of the mesoscopic model. The sharp increase in the energy dissipation rate at the onset of buckling is reproduced by incorporating a hysteresis loop into the strain energy that accounts for localized thermalization in the vicinity of buckling kinks. The ability of the mesoscopic model to reproduce the complex multistep processes of acoustic energy dissipation predicted by the atomistic simulations is demonstrated in mesoscopic simulations of free stretching and bending vibrations of individual CNTs. United States. Air Force Office of Scientific Research (Award FA9550-10-10545) National Science Foundation (U.S.) (Grant CBET-1033919) 2013-01-07T20:25:10Z 2013-01-07T20:25:10Z 2012-10 2012-07 Article http://purl.org/eprint/type/JournalArticle 1098-0121 1550-235X http://hdl.handle.net/1721.1/75858 Jacobs, William et al. “Acoustic Energy Dissipation and Thermalization in Carbon Nanotubes: Atomistic Modeling and Mesoscopic Description.” Physical Review B 86.16 (2012). © 2012 American Physical Society https://orcid.org/0000-0002-9693-5219 en_US http://dx.doi.org/10.1103/PhysRevB.86.165414 Physical Review B Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Nicholson, David A. Jacobs, William M. Zemer, Hagit Volkov, Alexey N. Zhigilei, Leonid V. Acoustic energy dissipation and thermalization in carbon nanotubes: Atomistic modeling and mesoscopic description |
| title | Acoustic energy dissipation and thermalization in carbon nanotubes: Atomistic modeling and mesoscopic description |
| title_full | Acoustic energy dissipation and thermalization in carbon nanotubes: Atomistic modeling and mesoscopic description |
| title_fullStr | Acoustic energy dissipation and thermalization in carbon nanotubes: Atomistic modeling and mesoscopic description |
| title_full_unstemmed | Acoustic energy dissipation and thermalization in carbon nanotubes: Atomistic modeling and mesoscopic description |
| title_short | Acoustic energy dissipation and thermalization in carbon nanotubes: Atomistic modeling and mesoscopic description |
| title_sort | acoustic energy dissipation and thermalization in carbon nanotubes atomistic modeling and mesoscopic description |
| url | http://hdl.handle.net/1721.1/75858 https://orcid.org/0000-0002-9693-5219 |
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