Single-File Diffusion of Confined Water Inside SWNTs: An NMR Study

被引：94

作者：

Das, Anindya ^{[1
]}

Jayanthi, Sundaresan ^{[1
,2
]}

Deepak, Handiganadu Srinivasa Murthy Vinay ^{[3
]}

Ramanathan, Krishna Venkatachala ^{[2
]}

Kumar, Anil ^{[1
,2
]}

Dasgupta, Chandan ^{[1
]}

Sood, Ajay K. ^{[1
]}

机构：

[1] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India

[2] Indian Inst Sci, NMR Res Ctr, Bangalore 560012, Karnataka, India

[3] Jain Univ, Dept Phys, Bangalore 560004, Karnataka, India

来源：

ACS NANO | 2010年 / 4卷 / 03期

关键词：

carbon nanotubes; water; confinement; single-file diffusion; NMR; NUCLEAR-MAGNETIC-RESONANCE; LONG-TIME LIMIT; CARBON NANOTUBES; SELECTIVITY; ADSORPTION; CHANNELS;

D O I：

10.1021/nn901554h

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report a nuclear magnetic resonance (NMR) study of confined water inside similar to 1.4 nm diameter single-walled carbon nanotubes (SWNTs). We show that the confined water does not freeze even up to 223 K. A pulse field gradient (PFG) NMR method is used to determine the mean squared displacement (MSD) of the water molecules inside the nanotubes at temperatures below 273 K, where the bulk water outside the nanotubes freezes and hence does not contribute to the proton NMR signal. We show that the mean squared displacement varies as the square root of time, predicted for single-file diffusion in a one-dimensional channel. We propose a qualitative understanding of our results based on available molecular dynamics simulations.

引用

页码：1687 / 1695

页数：9

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