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Effect of the Carbon-Nanotube Length on Water Permeability |
LI Jing-Yuan1;2;YANG Zai-Xing1,2;FANG Hai-Ping2;ZHOU Ru-Hong3,4, TANG
Xiao-Wei1 |
| 1Department of Physics, Zhejiang University, Hangzhou 3100272Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 2018003IBM Thomas J. Watson Research Center, Yorktown Heights, NY 10598, USA4Department of Chemistry, Columbia University, New York, NY 10027, USA |
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| Cite this article: |
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LI Jing-Yuan, YANG Zai-Xing, FANG Hai-Ping et al 2007 Chin. Phys. Lett. 24 2710-2713 |
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Abstract Effect of the carbon nanotube (CNT) channel length on the water flow
through the CNT is studied using molecular dynamics simulations. The water flow is found to decay with the channel length (～1/N2.3, N is the number of carbon rings along the nanotube axis), much faster than that predicted by a previous continuous-time random walk (CTRW) model (～1/N). This unexpected decay rate of flow is found to result from the weakening of the correlation of the concerted motion of the water molecules inside the CNT. An improved CTRW model is then proposed by taking into account of this effect. Meanwhile, the diffusion constant of water molecules inside CNTs with various
lengths is found to be relatively invariant, which results in a relatively constant hopping rate.
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| Keywords:
87.14.Gg
87.15.He
36.20.Ey
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Received: 15 April 2007
Published: 16 August 2007
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