提高水分子流出纳米碳管速度的特殊水分子偶极排布研究

亓文鹏; 涂育松; 万荣正; 方海平

doi:10.3879/j.issn.1000-0887.2011.09.002

提高水分子流出纳米碳管速度的特殊水分子偶极排布研究

doi: 10.3879/j.issn.1000-0887.2011.09.002

1.
山东大学物理学院,济南 250100;2.上海大学系统生物学研究所,上海 200444;
中国科学院上海应用物理研究所,上海 201800

基金项目: 国家自然科学基金资助项目(10825520);上海市教委科研创新资助项目(11YZ20)

详细信息

作者简介:
亓文鹏(1981- ),男,济南人,博士生(E-mail:qi-wenpeng@mail.sdu.edu.cn);方海平(1965- ),男,浙江人,教授,博士,博士生导师(联系人.Tel:+86-21-59554785;Fax:+86-21-39192394;E-mail:fanghaiping@sinap.ac.cn).

中图分类号: O352
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出版历程
- 收稿日期: 2011-04-29
- 修回日期: 2011-05-24
- 刊出日期: 2011-09-15

Water Molecules Exiting a Carbon Nanotube Driven by Special Water Dipole Orientations

1.
Department of Physics, Shandong University, Jinan 250100, P. R. China;
Institute of Systems Biology, Shanghai University, Shanghai 200444, P. R. China;

摘要

摘要: 使用分子动力学的方法，研究了水分子进出狭窄碳纳米管的过程．发现管口处水分子的偶极垂直于碳管时容易流出碳管．根据碳管中与之相邻的水分子的偶极方向可以把这种特殊构型分为2类．虽然，这2类特殊结构的出现概率非常小，但是它们对净流过碳管水分子的贡献与其它结构的贡献基本相同．这2种偶极排布中水分子比较接近管壁、远离Lennard-Jones势的平衡位置，导致这2种偶极排布中水分子能量升高，处于相对不稳定的状态，容易流出碳管．这个发现表明可以通过调控碳纳米管内的水分偶极方向控制管内的水分子流动．
- 水 /
- 纳米碳管 /
- 单行水链 /
- Lennard-Jones势
Abstract: One-dimensional ordered water molecules entering and exiting a carbon nanotube with appropriate radius were studied by molecular dynamics simulations.It was found that a water molecule near the nanotube end was more likely to be expelled from the nanotube if its dipole was almost aligned perpendicular to the nanotube axis.The key to this observation is that those water molecules are closer to the wall of nanotube away from the equilibrium position of Lennar-Jones potential,so that the interaction energy for those water molecules is relatively high.There are two particular structures of the perpendicular water depending on the dipole direction of the adjacent water molecule in the nanotube.Although the probabilities of these structures are quite small,their contributions to the net flux across the nanotube end are approximately equal to the predominant structures.The findings show the possibility of controlling the water flow by regulating the dipole directions of water molecules inside the nanochannels.
- water /
- carbon nanotube /
- single-file water chain /
- Lennard-Jones (LJ) interaction

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参考文献(31)

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提高水分子流出纳米碳管速度的特殊水分子偶极排布研究

doi: 10.3879/j.issn.1000-0887.2011.09.002

作者简介:
亓文鹏(1981- ),男,济南人,博士生(E-mail:qi-wenpeng@mail.sdu.edu.cn);方海平(1965- ),男,浙江人,教授,博士,博士生导师(联系人.Tel:+86-21-59554785;Fax:+86-21-39192394;E-mail:fanghaiping@sinap.ac.cn).

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Water Molecules Exiting a Carbon Nanotube Driven by Special Water Dipole Orientations

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提高水分子流出纳米碳管速度的特殊水分子偶极排布研究

doi: 10.3879/j.issn.1000-0887.2011.09.002

作者简介: 亓文鹏(1981- ),男,济南人,博士生(E-mail:qi-wenpeng@mail.sdu.edu.cn);方海平(1965- ),男,浙江人,教授,博士,博士生导师(联系人.Tel:+86-21-59554785;Fax:+86-21-39192394;E-mail:fanghaiping@sinap.ac.cn).

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出版历程

Water Molecules Exiting a Carbon Nanotube Driven by Special Water Dipole Orientations

计量

出版历程

目录

作者简介:
亓文鹏(1981- ),男,济南人,博士生(E-mail:qi-wenpeng@mail.sdu.edu.cn);方海平(1965- ),男,浙江人,教授,博士,博士生导师(联系人.Tel:+86-21-59554785;Fax:+86-21-39192394;E-mail:fanghaiping@sinap.ac.cn).