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Electrophoretically induced aqueous flow through single-walled carbon nanotube membranes.

Publication ,  Journal Article
Wu, J; Gerstandt, K; Zhang, H; Liu, J; Hinds, BJ
Published in: Nature nanotechnology
January 2012

Electrophoresis, the motion of charged species through liquids and pores under the influence of an external electric field, has been the principle source of chemical pumping for numerous micro- and nanofluidic device platforms. Recent measurements of ion currents through single or few carbon nanotube channels have yielded values of ion mobility that range from close to the bulk mobility to values that are two to seven orders of magnitude higher than the bulk mobility. However, these experiments cannot directly measure ion flux. Experiments on membranes that contain a large number of nanotube pores allow the ion current and ion flux to be measured independently. Here, we report that the mobilities of ions within such membranes are approximately three times higher than the bulk mobility. Moreover, the induced electro-osmotic velocities are four orders of magnitude faster than those measured in conventional porous materials. We also show that a nanotube membrane can function as a rectifying diode due to ionic steric effects within the nanotubes.

Duke Scholars

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Published In

Nature nanotechnology

DOI

EISSN

1748-3395

ISSN

1748-3387

Publication Date

January 2012

Volume

7

Issue

2

Start / End Page

133 / 139

Related Subject Headings

  • Water
  • Nanotubes, Carbon
  • Nanoscience & Nanotechnology
  • Nanopores
  • Membranes, Artificial
  • Ions
  • Ion Exchange
  • Electrophoresis
 

Citation

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Wu, J., Gerstandt, K., Zhang, H., Liu, J., & Hinds, B. J. (2012). Electrophoretically induced aqueous flow through single-walled carbon nanotube membranes. Nature Nanotechnology, 7(2), 133–139. https://doi.org/10.1038/nnano.2011.240
Wu, Ji, Karen Gerstandt, Hongbo Zhang, Jie Liu, and Bruce J. Hinds. “Electrophoretically induced aqueous flow through single-walled carbon nanotube membranes.Nature Nanotechnology 7, no. 2 (January 2012): 133–39. https://doi.org/10.1038/nnano.2011.240.
Wu J, Gerstandt K, Zhang H, Liu J, Hinds BJ. Electrophoretically induced aqueous flow through single-walled carbon nanotube membranes. Nature nanotechnology. 2012 Jan;7(2):133–9.
Wu, Ji, et al. “Electrophoretically induced aqueous flow through single-walled carbon nanotube membranes.Nature Nanotechnology, vol. 7, no. 2, Jan. 2012, pp. 133–39. Epmc, doi:10.1038/nnano.2011.240.
Wu J, Gerstandt K, Zhang H, Liu J, Hinds BJ. Electrophoretically induced aqueous flow through single-walled carbon nanotube membranes. Nature nanotechnology. 2012 Jan;7(2):133–139.

Published In

Nature nanotechnology

DOI

EISSN

1748-3395

ISSN

1748-3387

Publication Date

January 2012

Volume

7

Issue

2

Start / End Page

133 / 139

Related Subject Headings

  • Water
  • Nanotubes, Carbon
  • Nanoscience & Nanotechnology
  • Nanopores
  • Membranes, Artificial
  • Ions
  • Ion Exchange
  • Electrophoresis