DocumentCode :
3320284
Title :
I nfluence of biphenyl chemisorption on the thermal properties of single-walled carbon nanotube
Author :
Chen, Bin-Hao ; Chang, Mu-Li ; Lan, Chao-Ho ; Tsau, Fang-Hei ; Jeng, Ming-Shan ; Ku, Jie-Ren ; Huang, Chn-Ju ; Lin, Song-Yih
Author_Institution :
Energy & Environ. Labs., Ind. Technol. Res. Inst., Tainan, Taiwan
Volume :
2
fYear :
2010
fDate :
5-7 May 2010
Firstpage :
314
Lastpage :
317
Abstract :
Non-equilibrium molecular dynamics simulations are performed to investigate the influences of chemisorption biphenyl rings under axial thermal loadings of 1.65 K/Å. This investigation determines carbon nanotube thermal conductivity at biphenyl rings sorption density ranging from 0%~30%, using a non-equilibrium molecular dynamics simulation with true carbon potentials. The thermal impact causes system fluctuation in the initial 3 ps leading to a transport region temperature as high as 400K. The thermal relaxation process reduces impact energy influence after 30 ps and leads to Maxwell´s distribution. Steady-state constant heat flux is observed after thermal equilibrium. Furthermore, the temperature curves show distinct high disturbance at initial time and linear distribution along the tube axial direction after steady-state. Simulations are performed on pristine CNTs and CNTs on which 0.25%, 1%, 5%, 10%, 15%, 20%, 25% and 30% of the carbon atoms have a bonded biphenyl group. The case where biphenyl groups are attached to 0.25% of the atoms on a nanotube is illustrated in the left panel of Figure 1. Results suggest that thermal conductivity value increases with increasing CNT subjected to thermal loading up to a temperature gradient of ~20 K/Å representing rapidly thermal conductivity drop at sorption density of 10%. The functionalized CNTs all show significantly smaller thermal conductivities. Simulation results yield precise understanding of nano-scale transient heat transfer characteristics in a single-wall carbon nanotube.
Keywords :
carbon nanotubes; chemical equilibrium; chemical relaxation; chemisorption; heat transfer; molecular dynamics method; thermal conductivity; Maxwell distribution; axial thermal loading; biphenyl chemisorption; biphenyl rings sorption density; bonded biphenyl group; carbon nanotube thermal conductivity; chemisorption biphenyl rings; impact energy; nanoscale transient heat transfer; nonequilibrium molecular dynamics simulation; single-walled carbon nanotube; steady-state constant heat flux; system fluctuation; thermal equilibrium; thermal impact; thermal property; thermal relaxation; transport region temperature; true carbon potentials; Automatic control; Automation; Carbon nanotubes; Communication system control; Decision support systems; Deformable models; Fluctuations; Temperature; Thermal conductivity; Thermal loading; chemisorption carbon nanotubes; molecular dynamics; thermal conductivity;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Computer Communication Control and Automation (3CA), 2010 International Symposium on
Conference_Location :
Tainan
Print_ISBN :
978-1-4244-5565-2
Type :
conf
DOI :
10.1109/3CA.2010.5533490
Filename :
5533490
Link To Document :
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