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Int J Mol Sci. 2019 Aug 7;20(16). pii: E3851. doi: 10.3390/ijms20163851.

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

Wu P1, Shi J2,3, Wang J4, Shen J5, Cai K6,7.

Author information

1
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China.
2
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China. shijiaoau@163.com.
3
State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China. shijiaoau@163.com.
4
School of Port and Transportation Engineering, Zhejiang Ocean University, Zhoushan 316022, China.
5
Centre for Innovative Structures and Materials, RMIT University, Melbourne 3083, Australia.
6
College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China. kun.cai@rmit.edu.au.
7
Centre for Innovative Structures and Materials, RMIT University, Melbourne 3083, Australia. kun.cai@rmit.edu.au.

Abstract

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.

KEYWORDS:

interface friction; molecular dynamics; nanotube; rotation transmission system; torque moment

PMID:
31394762
PMCID:
PMC6720778
DOI:
10.3390/ijms20163851
[Indexed for MEDLINE]
Free PMC Article

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