Collective diffusion in carbon nanotubes: Crossover between one dimension and three dimensions |
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| Affiliation: | Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, College of Science and Engineering, Jinan University, Guangzhou 510632, China |
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| Abstract: | Using non-equilibrium molecular dynamics and Monte Carlo methods, we study the collective diffusion of helium in carbon nanotubes. The results show that the collective diffusion coefficient(CDC) increases with the dimension of the channel. The collective diffusion coefficient has a linear relationship with the temperature and the concentration. There exist a ballistic transport in short carbon nanotubes and a diffusive transport in long carbon nanotubes. Fick's law has an invalid region in the nanoscale channel. |
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| Keywords: | transport carbon nanotube fluid |
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