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TIP DEFORMATION AND BUCKLING OF CARBON NANOTUBES ON A GRAPHITE SURFACE
| Title: | TIP DEFORMATION AND BUCKLING OF CARBON NANOTUBES ON A GRAPHITE SURFACE |
| Author: | Paudel, Naba Raj |
| Description: | Carbon nanotubes (CNTs) have attracted great interest because of their excellent mechanical, electrical and chemical properties. With the development of new experimental techniques, the buckling and bending behaviors of the CNTs have been observed under large deformation. In addition, remarkable adhesive forces of gecko’s foot hairs and nanotubes on substrates have been investigated experimentally. In the present work, carbon nanotubes of different lengths are pressed against graphite surfaces to investigate deformation and adhesion of CNTs by using molecular dynamics simulation and energy minimization methods. The simulations reveal the mechanisms of the buckling, bending and slipping of the CNTs on the rigid and relaxed graphite surfaces. Layer by layer deformations of the CNT tips were observed. Also, we observed the overall deformation (bending and buckling) of CNTs, which depends on their length. We found that structural changes of a nanotube which is compressed normal to the graphite surface can be analyzed by using Fourier harmonics. The adhesion force between a nanotube and a graphite surface is studied for three different surface positions. Finally, different tilted orientations of CNT tips are considered. The maximum buckling length is found at 15 degrees with respect to the surface normal where the existing interaction between the nanotube and the graphite surface becomes extremum. |
| Permanent Link: |
http://rave.ohiolink.edu/etdc/view?acc_num=akron1185563606
http://hdl.handle.net/2374.OX/3544 |
| Date: | 2007 |
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