Abstract
The molecular dynamics (MD) method is used to investigate the influence of the shielding gas on the dynamic behavior of the heterogeneous rotation transmission nano-system (RTS) built on carbon nanotubes (CNTs) and boron nitride nanotube (BNNT) in a helium environment. In the heterogeneous RTS, the inner CNT acts as a rotor, the middle BNNT serves as a motor, and the outer CNT functions as a stator. The rotor will be actuated to rotate by the motor due to the interlayer van der Waals effects and the end effects. The MD simulation results show that, when the gas density is lower than a critical range, a stable signal of the rotor will arise on the output and the rotation transmission ratio (RRT) of RTS can reach 1.0, but as the gas density is higher than the critical range, the output signal of the rotor cannot be stable due to the sharp drop of the RRT caused by the large friction between helium and the RTS. The greater the motor input signal of RTS, the lower the critical working helium density range. The results also show that the system temperature and gas density are the two main factors affecting the RTS transmission behavior regardless of the size of the simulation box. Our MD results clearly indicate that in the working temperature range of the RTS from 100 K to 600 K, the higher the temperature and the lower the motor input rotation frequency, the higher the critical working helium density range allows.
Highlights
Nanomachines have attracted a lot of attention recently with the rapid development of nanotechnology [1,2] and the urgent requirements in chemical and biological engineering [3,4], especially after the 2016 Nobel Prize in Chemistry was issued to three scientists
The Nano-Electro-Mechanical System (NEMS) [6] is considered to be one of the important components in nanotechnology, which has the characteristics of quantum effect, interface effect, size effect, and so on
As a mature simulation method, the molecular dynamics (MD) method [27,28] has become an important method for researchers to study the related properties of nanotubes, and provides a powerful tool that satisfies some of the requirements for designing the nanomotors at a nano scale
Summary
Nanomachines have attracted a lot of attention recently with the rapid development of nanotechnology [1,2] and the urgent requirements in chemical and biological engineering [3,4], especially after the 2016 Nobel Prize in Chemistry was issued to three scientists CNTs have two excellent mechanical properties, one is the extremely high modulus and strength [16,17], and the other is the extremely low friction between adjacent layers of multi-walled carbon nanotubes (MWCNTs) [18,19]. As an important component in providing power for the movement of nanodevices, need to be designed according to the service environment, and its movement should be controllable [26]. As a mature simulation method, the molecular dynamics (MD) method [27,28] has become an important method for researchers to study the related properties of nanotubes, and provides a powerful tool that satisfies some of the requirements for designing the nanomotors at a nano scale
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