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Water and Ion Permeation through Electrically Charged Nanopore |
ZENG Li1,2;ZUO Guang-Hong3;GONG Xiao-Jing1,2;LU Hang-Jun1,2;WANG
Chun-Lei1,2;WU Ke-Fei1,2;WAN Rong-Zheng 1,4 |
| 1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, PO Box 800-204, Shanghai 2018002Graduate School of the Chinese Academy of Sciences, Beijing 1000803T-Life Research Center, Department of Physics, Fudan University, Shanghai 2004334Theoretical Physics Center for Science Facilities (TPCSF),Chinese Academy of Sciences, Beijing 100049 |
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| Cite this article: |
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ZENG Li, ZUO Guang-Hong, GONG Xiao-Jing et al 2008 Chin. Phys. Lett. 25 1486-1489 |
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Abstract The behaviour of water and small solutes in confined geometries is important to a variety of chemical and nanofluidic applications. Here we investigate the permeation and distribution of water and ions in electrically charged carbon
cylindrical nanopore during the osmotic process using molecular dynamics simulations. In the simulations, charges are distributed uniformly on the pores with diameter of 0.9nm. For nanopores with no charge or a low charge, ions are difficult to enter. With the increasing of charge densities on the pores, ions will appear inside the nanopores because of the large electronic forces between the ions and the charged pores. Different ion entries induce varying effects on osmotic water flow. Our simulations reveal that the osmotic water
can flow through the negatively charged pore occupied by K+ ions, while water flux through the positively charged pores will be disrupted by Cl- ions inside the pores. This may be explained by the different radial distributions of K+ ions and Cl- ions inside the charged nanopores.
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87.18.Bb
82.39.Wj
47.56.+r
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Received: 21 November 2007
Published: 31 March 2008
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| PACS: |
87.18.Bb
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82.39.Wj
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(Ion exchange, dialysis, osmosis, electro-osmosis, membrane processes)
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47.56.+r
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(Flows through porous media)
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