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Electrophoretically induced aqueous flow through single-wall carbon nanotube membranes
Electrophoresis, the motion of charged species through liquids and pores under an external electric field, has been principle source of chemical pumping for numerous micro- and nano-fluidic devices platforms. Recent studies of ion current through single or few carbon nanotube channels range from nea...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
2012
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4134328/ https://www.ncbi.nlm.nih.gov/pubmed/22245860 http://dx.doi.org/10.1038/nnano.2011.240 |
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author | Wu, Ji Gerstandt, Karen Zhang, Hongbo Liu, Jie Hinds, Bruce. J. |
author_facet | Wu, Ji Gerstandt, Karen Zhang, Hongbo Liu, Jie Hinds, Bruce. J. |
author_sort | Wu, Ji |
collection | PubMed |
description | Electrophoresis, the motion of charged species through liquids and pores under an external electric field, has been principle source of chemical pumping for numerous micro- and nano-fluidic devices platforms. Recent studies of ion current through single or few carbon nanotube channels range from near bulk mobility to 2-7 orders of magnitude of enhancement but cannot directly measure ion flux. Membranes, with large number of nanotube pores, allow independent confirmation of ion current and flux. Here we report that the aqueous electrophoretic mobility of ions within the graphitic cores of carbon nanotube membranes, with a uniform pore size of 0.9 ± 0.2 nm, is enhanced ∼3 times that of bulk mobilities. The induced electroosmotic velocities are 4 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 tightly controlled nanotube diameter. |
format | Online Article Text |
id | pubmed-4134328 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2012 |
record_format | MEDLINE/PubMed |
spelling | pubmed-41343282014-08-15 Electrophoretically induced aqueous flow through single-wall carbon nanotube membranes Wu, Ji Gerstandt, Karen Zhang, Hongbo Liu, Jie Hinds, Bruce. J. Nat Nanotechnol Article Electrophoresis, the motion of charged species through liquids and pores under an external electric field, has been principle source of chemical pumping for numerous micro- and nano-fluidic devices platforms. Recent studies of ion current through single or few carbon nanotube channels range from near bulk mobility to 2-7 orders of magnitude of enhancement but cannot directly measure ion flux. Membranes, with large number of nanotube pores, allow independent confirmation of ion current and flux. Here we report that the aqueous electrophoretic mobility of ions within the graphitic cores of carbon nanotube membranes, with a uniform pore size of 0.9 ± 0.2 nm, is enhanced ∼3 times that of bulk mobilities. The induced electroosmotic velocities are 4 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 tightly controlled nanotube diameter. 2012-01-15 /pmc/articles/PMC4134328/ /pubmed/22245860 http://dx.doi.org/10.1038/nnano.2011.240 Text en Users may view, print, copy, download and text and data- mine the content in such documents, for the purposes of academic research, subject always to the full Conditions of use: http://www.nature.com/authors/editorial_policies/license.html#terms |
spellingShingle | Article Wu, Ji Gerstandt, Karen Zhang, Hongbo Liu, Jie Hinds, Bruce. J. Electrophoretically induced aqueous flow through single-wall carbon nanotube membranes |
title | Electrophoretically induced aqueous flow through single-wall carbon nanotube membranes |
title_full | Electrophoretically induced aqueous flow through single-wall carbon nanotube membranes |
title_fullStr | Electrophoretically induced aqueous flow through single-wall carbon nanotube membranes |
title_full_unstemmed | Electrophoretically induced aqueous flow through single-wall carbon nanotube membranes |
title_short | Electrophoretically induced aqueous flow through single-wall carbon nanotube membranes |
title_sort | electrophoretically induced aqueous flow through single-wall carbon nanotube membranes |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4134328/ https://www.ncbi.nlm.nih.gov/pubmed/22245860 http://dx.doi.org/10.1038/nnano.2011.240 |
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