期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 20, 期 16, 页码 -出版社
MDPI
DOI: 10.3390/ijms20163851
关键词
rotation transmission system; interface friction; nanotube; torque moment; molecular dynamics
资金
- National Key Research and Development Plan, China [2017YFC0405102]
- National Natural Science Foundation, China [11372281]
- State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, China [GZ18111]
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 (omega(M)) 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 omega(M). When the rotor was subjected to an external resistant torque moment (M-r), 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 M-r 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.
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