Electrokinetic Transport of Methanol and Lithium Ions Through a 2.25-nm-Diameter Carbon Nanotube Nanopore
Electrokinetic Transport of Methanol and Lithium Ions Through a 2.25-nm-Diameter Carbon Nanotube Nanopore
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DOI：
10.1021/acs.jpcc.6b12104
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发表时间：
2017-01
影响因子：
3.7
通讯作者：
M. D. Ellison;Samuel G. Menges;Laura Nebel;Gabrielle D’Arcangelo;Anna Kramer;L. W. Drahushuk;Jesse D. Benck;S. Shimizu;M. Strano
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作者：
M. D. Ellison;Samuel G. Menges;Laura Nebel;Gabrielle D’Arcangelo;Anna Kramer;L. W. Drahushuk;Jesse D. Benck;S. Shimizu;M. Strano
碳纳米管的流动增强和分子选择性使其成为独特的纳米孔管道。在这项研究中，我们分别研究了 Li+ 和甲醇通过直径 2.25 nm、长 200 μm 的单壁碳纳米管 (SWNT) 的传输。发现 Li+ 和甲醇的阈值电压分别为 200 mV 和 700 mV，表现出孔堵塞。随着施加电场的增加，Li + 和甲醇的孔阻塞电流通常都在 1 至 6 pA 的范围内增加。甲醇和水合锂离子的简单体积模型与这些观察结果一致。对于 200 至 1000 mV 之间的施加电压，Li+ 传输的停留时间从 200 至 1200 ms 变化，并与反电场成线性比例。这些结果表明电泳迁移率为 1.6 × 10–7 m2 V–1 s–1，与之前对 SWNT 中碱金属离子的测量结果一致。相反，对于 700 至 1000 mV 之间的外加电压，甲醇的停留时间仍然......
The flow enhancement and molecular selectivity of carbon nanotubes make them unique nanopore conduits. In this study, we examine separately the transport of Li+ and methanol through a 2.25 nm-diameter, 200-μm long single-walled carbon nanotube (SWNT). Threshold voltages of 200 mV and 700 mV were found for Li+ and methanol, respectively, to exhibit pore blocking. As the applied electric field was increased, the pore-blocking currents for Li+ and for methanol were both found to generally increase in the range of 1 to 6 pA. A simple volumetric model for methanol and hydrated Li+ is consistent with these observations. For applied voltages between 200 and 1000 mV, the dwell times for Li+ transport varied from 200 to 1200 ms and scaled linearly with inverse electric field. These results indicate an electrophoretic mobility of 1.6 × 10–7 m2 V–1 s–1, in agreement with previous measurements of alkali metal ions in SWNTs. Conversely, for applied voltages between 700 and 1000 mV, the dwell times for methanol remaine...