XII. Thermal and Mechanical Properties of Nanotubes
At the present time a variety of nanoelectromechanical systems (NEMS) that employ carbon nanotube walls or graphene layers as movable elements are being developed. The crucial issue for the design of such NEMS is the possibility to predict the system behavior at macroscopic operation times (more than 1 s) depending on the microscopic structure of the whole device and its components. We developed a multi-level approach for studying the operation characteristics of the NEMS based on carbon nanostructures.This abstract was created on: 2009/6/4 12:17:59 (EST).
In the framework of this approach, the tribological properties of NEMS were investigated depending on the parameters and microscopic structure of the system through molecular dynamics simulations. The results of this study for the gigahertz oscillator based on a double-walled nanotube are presented in . These data were then used to describe the dynamic behavior of the NEMS at long simulation times with the help of a phenomenological model . The phenomenological model was applied to obtain the parameters of the system at which the control over the oscillation is possible with an external force. The model was also used to investigate the effect of thermodynamic fluctuations on the oscillator operation.
Significant thermodynamic fluctuations were revealed in the considered NEMS. Thermodynamic fluctuations were shown to lead to a breakdown of the controlled oscillation. Based on the Fokker-Plank equation for the energy distribution function of the gigahertz oscillator and calculations with the phenomenological model we found dependences of the lifetime of the stationary operation mode on the parameters of the system. It was shown that the stability of the NEMS operation subject to thermodynamic fluctuations can be achieved with increasing the amplitude of the control force and the NEMS size.
1. I. V. Lebedeva, A. A. Knizhnik, A. M. Popov, Yu. E. Lozovik and B. V. Potapkin, Nanotechnology 20, 105202 (2009).
2. O.V. Ershova, Yu. E. Lozovik, A.M. Popov, O.N. Bubelí, E.F. Kislyakov, N.A. Poklonskii, A.A. Knizhnik, I.V. Lebedeva, JETP, 107, 653 (2008).
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