The effect of hydrogen bonds on diffusion mechanism of water inside single-walled carbon nanotubes

被引:26
作者
Chen, Qu
Wang, Qi
Liu, Ying-Chun [1 ]
Wu, Tao
机构
[1] Zhejiang Univ, Soft Matter Res Ctr, Hangzhou 310027, Peoples R China
基金
中国国家自然科学基金;
关键词
FILE DIFFUSION; MOLECULAR-DYNAMICS; LIQUID; CONDUCTION; SIMULATION; DENSITY; CHANNEL; MODELS;
D O I
10.1063/1.4879796
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Nanopores can serve as a molecule channel for transport of fluid, where water diffusion differs remarkably from that of simple particles. Hydrogen bonds play an essential role in the diffusion anomaly. Detailed investigations are carried out on the systems of rigid (6, 6), (7, 7), (8, 8), (9, 9), and (10, 10) armchair carbon nanotubes, solvated with Lennard-Jones water fluids. The role of hydrogen bonds is examined by diffusivity statistics and animation snapshots. It is found that in small (6,6) CNT, hydrogen bonds tend to aggregate water into a wire and lead to rapid collective drift. Confinement can stabilize the hydrogen bond of water molecules and enhance its lifetime. In relatively smaller CNTs, the diffusion mechanism could be altered by the temperature. Moreover, in larger nanotubes hydrogen bonding network allows the water to form regional concentrated clusters. This allows water fluid in extremely low density exhibit rather slow self-diffusion motion. This fundamental study attempts to provide insights in understanding nanoscale delivery system in aqueous solution. (C) 2014 AIP Publishing LLC.
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页数:7
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