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The oscillatory damped behavior of double wall carbon nanotube oscillators in gaseous environment

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【Author】 LI Jian1, BI KeDong1, CHEN MinHua1& CHEN YunFei1,2 1 Jiangsu Key Laboratory for Design and Fabrication of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, China; 2 Key Laboratory of MEMS of Educational Ministry, Southeast University, Nanjing 211189, China

【摘要】 The mechanical oscillatory behaviors of multiwall carbon nanotube oscillators in gaseous environment are investigated using the molecular dynamics method. The effects of ambient gas and temperature on intertube frictional force and oscillation frequency are analyzed. It is found that the intertube frictional force increases with the ambient gas density and temperature. Higher gas density and higher tem- perature cause a more rapid decay in the oscillation amplitude and an increase of the oscillation fre- quency. Compared to the vacuum environmental condition, the collision between gas atoms and the nanotube walls is a main ingredient leading to the increase of the energy dissipation. Gas damping may be the main reason for the failure of carbon nanotube oscillators working in gas environment. The am- bient temperature also has an important effect on oscillations and low temperature is advantageous to sustain oscillations.

【Abstract】 The mechanical oscillatory behaviors of multiwall carbon nanotube oscillators in gaseous environment are investigated using the molecular dynamics method. The effects of ambient gas and temperature on intertube frictional force and oscillation frequency are analyzed. It is found that the intertube frictional force increases with the ambient gas density and temperature. Higher gas density and higher tem- perature cause a more rapid decay in the oscillation amplitude and an increase of the oscillation fre- quency. Compared to the vacuum environmental condition, the collision between gas atoms and the nanotube walls is a main ingredient leading to the increase of the energy dissipation. Gas damping may be the main reason for the failure of carbon nanotube oscillators working in gas environment. The am- bient temperature also has an important effect on oscillations and low temperature is advantageous to sustain oscillations.

【基金】 Supported by the National Basic Research Program of China (“973”) (Grant No. 2006CB300404);the National Natural Science Foundation of China (Grant Nos. 50676019, 50775017);the Jiangsu Province Natural Science Foundation (Grant Nos. BK2006510, BK2007113);the Research Funding for the Doctor Program from Chinese Educational Ministry (Grant No. 20050286019)
  • 【文献出处】 Science in China(Series E:Technological Sciences) ,中国科学(E辑:技术科学)(英文版) , 编辑部邮箱 ,2009年04期
  • 【分类号】TB383.1
  • 【被引频次】1
  • 【下载频次】29
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