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Open AccessArticle

Critical Output Torque of a GHz CNT-Based Rotation Transmission System Via Axial Interface Friction at Low Temperature

by Puwei Wu 1, Jiao Shi 1,2,*, Jinbao Wang 3, Jianhu Shen 4 and Kun Cai 1,4,*
1
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China
2
State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China
3
School of Port and Transportation Engineering, Zhejiang Ocean University, Zhoushan 316022, China
4
Centre for Innovative Structures and Materials, RMIT University, Melbourne 3083, Australia
*
Authors to whom correspondence should be addressed.
Int. J. Mol. Sci. 2019, 20(16), 3851; https://doi.org/10.3390/ijms20163851
Received: 2 July 2019 / Revised: 20 July 2019 / Accepted: 21 July 2019 / Published: 7 August 2019
(This article belongs to the Special Issue Carbon-Based Nanomaterials)
It was discovered that a sudden jump of the output torque moment from a rotation transmission nanosystem made from carbon nanotubes (CNTs) occurred when decreasing the system temperature. In the nanosystem from coaxial-layout CNTs, the motor with specified rotational frequency (ωM) can drive the inner tube (rotor) to rotate in the outer tubes. When the axial gap between the motor and the rotor was fixed, the friction between their neighbor edges was stronger at a lower temperature. Especially at temperatures below 100 K, the friction-induced driving torque increases with ωM. When the rotor was subjected to an external resistant torque moment (Mr), it could not rotate opposite to the motor even if it deformed heavily. Combining molecular dynamics simulations with the bi-sectioning algorithm, the critical value of Mr was obtained. Under the critical torque moment, the rotor stopped rotating. Accordingly, a transmission nanosystem can be designed to provide a strong torque moment via interface friction at low temperature. View Full-Text
Keywords: rotation transmission system; interface friction; nanotube; torque moment; molecular dynamics rotation transmission system; interface friction; nanotube; torque moment; molecular dynamics
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Wu, P.; Shi, J.; Wang, J.; Shen, J.; Cai, K. Critical Output Torque of a GHz CNT-Based Rotation Transmission System Via Axial Interface Friction at Low Temperature. Int. J. Mol. Sci. 2019, 20, 3851.

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