The coupled oscillation of multi-walled CNT oscillators consisting of (5n,5n) CNTs was investigated by molecular
dynamics simulations. The oscillation feature of the CNT oscillators can not be described by a continuum theory. All
walls of the multi-walled CNT are oscillated due to the interwall coupling. The frequencies of the multi-walled CNT oscillators are higher than those of the double-walled CNT oscillators. In spire of the different core CNT, the frequency peaks due to the interwall coupling are similar to each other as the number of walls increases. This reason is that the interwall coupling effects increase as the number of walls increases.
We investigated a carbon nanotube (CNT) oscillator controlled by the thermal gas expansion using classical molecular
dynamics simulations. When the temperature rapidly increased, the force on the CNT oscillator induced by the thermal
gas expansion rapidly increased and pushed out the CNT oscillator. As the CNT oscillator extruded from the outer
nanotube, the suction force on the CNT oscillator increased by the excess van der Waals <i>vdW</i> energy. When the CNT
oscillator reached at the maximum extrusion point, the CNT oscillator was encapsulated into the outer nanotube by the
suction force. Therefore, the CNT oscillator could be oscillated by both the gas expansion and the excess <i>vdW</i> interaction.
As the temperature increased, the amplitude of the CNT oscillator increased. At the high temperatures, the CNT
oscillator escaped from the outer nanotube, because the force on the CNT oscillator due to the thermal gas expansion was
higher than the suction force due to the excess <i>vdW</i> energy. By the appropriate temperature controls, such as the
maximum temperature, the heating rate, and the cooling rate, the CNT oscillator could be operated.
We investigated a linear carbon nanotube motor serving as the key building block for nanoscale motion control by
using molecular dynamics simulations. This linear nanomotor, is based on the electrostatically telescoping multi-walled
carbon-nanotube with ultralow intershell sliding friction, is controlled by the gate potential with the capacitance feedback
sensing. The resonant harmonic peaks are induced by the interference between the driving frequencies and its self-frequency.
The temperature is very important factor to operate this nanomotor.