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Bending properties of carbon nanotubes encapsulating solid nanowires
D Danailov1, P Keblinski, S Nayak
1Materials Science and Engineering Department, Rensselaer Polytechnic Institute, Troy, New York, USA.
Journal of Nanoscience and Nanotechnology
|August 12, 2003
Summary
Encapsulating metal nanowires inside carbon nanotubes suppresses buckling and enhances bending strength. These filled nanotubes also exhibit significant oscillation damping, unlike hollow tubes.
Area of Science:
- Materials Science
- Nanotechnology
- Mechanical Engineering
Background:
- Single-walled carbon nanotubes (SWCNTs) are promising for nanodevices but susceptible to buckling.
- Understanding mechanical properties of filled nanotubes is crucial for applications.
Purpose of the Study:
- To investigate the effect of metal nanowire encapsulation on the mechanical properties of SWCNTs.
- To analyze bending strength, buckling instability, and vibrational damping.
Main Methods:
- Atomistic simulations using empirical potentials.
- Modeling three-point bend tests on SWCNTs with and without metal nanowires.
Main Results:
- Metal nanowire filling significantly suppresses tube-buckling instability.
- Bending strength increases with tube diameter; deflection before buckling is unaffected.
- Filled tubes show lowered vibrational frequencies due to increased inertia.
- Remarkable damping of oscillations observed in metal-filled tubes, absent in hollow tubes.
Conclusions:
- Encapsulating metal nanowires enhances SWCNT bending strength and flexibility.
- Solid filling modifies mechanical behavior, suggesting utility in micromechanical devices and nanoprobes.