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• W124800929 abstract "In this paper the non-linear dynamics of nanotubes is investigated with a look into their applications in nanoelectromechanical systems (NEMS). The understanding of the dynamics of NEMS, always oscillating -at least as a consequence of the thermal vibrations- represents a still open and fundamental issue towards an optimal dynamic design of nanotube based devices. The vibrations of NEMS are usually studied assuming a linear behavior and without considering the effect of the electrical field imposed to control the device. In spite of this, the presence of the electrostatic charges implies that the nanotube cannot be considered as free, as usually assumed. Moreover, linear behavior, implicitly corresponding to assume small displacements, seems to be in contrast with the observed high flexibility of nanotubes, capable of undergoing large displacements remaining in elastic regime. In this paper, we try to remove these assumptions, deriving the corresponding equation governing the motion of the device under large displacements and electrostatic loading. The role of the van der Waals forces, significant only for very small gaps (few nanometers), is also investigated. Instead of solving numerically the derived equation for different case studies, we obtain an approximated solution studying the oscillations around the static configuration that minimizes the free-energy of the NEMS. Finally, the amplitude of the intrinsic oscillations at OK, as imposed by the uncertainty principle, are estimated. A validation of the analysis is achieved by a comparison with experimental observations of thermal oscillations in singly or doubly clamped nanotubes. In addition, the intensity of the electrical field corresponding to a vanishing oscillating frequency, i.e., to a structural instability, is predicted and compared with numerical simulations. Such simple prediction of the pull-in voltage is shown to be fundamental, since it represents the key design parameter, describing the on/off transition of the device." @default.
• W124800929 created "2016-06-24" @default.
• W124800929 creator A5024093529 @default.
• W124800929 date "2004-01-01" @default.
• W124800929 modified "2023-09-27" @default.
• W124800929 title "Non-linear dynamics of nanotube based NEMS" @default.
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