Friction effect of stator in a multi-walled CNT-based rotation transmission system

Abstract

The rotation transmission system (RTS) made from co-axial multi-walled nanotubes (MWNTs) has the function of regulating the input rotation from a nanomotor. The mechanism for the regulation is that the friction among the tubes during rotation governs the rotation of the rotors in the nanosystem. By integrating a rotary nanomotor and a nanobearing into an MWNT-based RTS, it is discovered that the stator (outer tube) provides relatively greater friction on the rotors by penetrating the motor tube, which has a higher stable rotational frequency. And the output rotation of the rotors in the system depends significantly on the temperature of the system, as the rotor tubes are slightly longer than the motor tube. Briefly, at low temperatures, say 8 K, the rotors rotate synchronously with the motor. However, at high temperatures, the rotors rotate slower than the motor with a bigger difference between their rotational frequencies. Hence, the output rotational frequencies can be adjusted by changing the temperature as well as the input rotational frequency.

Diamond Needles Actuating Triple-Walled Carbon Nanotube to Rotate via Thermal Vibration-Induced Collision

“…When an edge of the rotor moves closer to the outer edge of a mid-tube, by considering the effect of edge potential barrier [29,30], the rotor can provide stronger friction for the mid-tube which will be driven to rotate faster than the other mid-tube. This phenomenon applies also in asynchronous rotation transmission system [31].…”

“…During rotating, the rotor is subjected to the inter-shell friction from both the stators and the mid-tubes [31]. Moreover, the friction increases with their relative speeds [26].…”

Precise control of CNT-DNA assembled nanomotor using oppositely charged dual nanopores

“…A rotational drive system made of co-axial multi-walled nanotubes has the function of regulating the input rotation of the nanomotor. 32 A nanoscale rotating system consisting of a graphene substrate and defect-effect-driven triple-walled nanotubes performed well. 33 Rotation of the nanotubes was found to be driven by the defects placed on the graphene with a stable rotation frequency.…”

Dynamic Behavior of Rotation Transmission Nano-System in Helium Environment: A Molecular Dynamics Study

“…Alternatively, Cai et al [37,38] proposed a rotation transmission nano-system RTS consisting of an independent single-walled carbon nanotube (SWCNT) as a nanomotor and a group of coaxially arranged MWCNTs as nanobearing, in which the transmission of the rotation signal between the nanomotor and the nanobearing mainly depends on the interaction between adjacent ends. In addition, some researchers integrated nanomotor and nanobearing into another RTS model using a group of concentric MWCNTs [39][40][41][42][43]. Taking the advantage of the unique properties of boron nitride nanotube (BNNT) [44][45][46][47][48] and the excellent thermal and mechanical properties [49][50][51] of the heterogeneous CNT@BNNT, Zheng et al [43] presented a novel RTS model of heterogeneous triple-walled nanotubes (TWNTs) based on CNTs and BNNT.…”