Ion selectivity of graphene nanopores
As population growth continues to outpace development of water infrastructure in many countries, desalination (the removal of salts from seawater) at high energy efficiency will likely become a vital source of fresh water. Due to its atomic thinness combined with its mechanical strength, porous grap...
| Main Authors: | , , |
|---|---|
| Format: | Online |
| Language: | English |
| Published: |
Nature Publishing Group
2016
|
| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4844701/ |
| id |
pubmed-4844701 |
|---|---|
| recordtype |
oai_dc |
| spelling |
pubmed-48447012016-04-27 Ion selectivity of graphene nanopores Rollings, Ryan C. Kuan, Aaron T. Golovchenko, Jene A. Article As population growth continues to outpace development of water infrastructure in many countries, desalination (the removal of salts from seawater) at high energy efficiency will likely become a vital source of fresh water. Due to its atomic thinness combined with its mechanical strength, porous graphene may be particularly well-suited for electrodialysis desalination, in which ions are removed under an electric field via ion-selective pores. Here, we show that single graphene nanopores preferentially permit the passage of K+ cations over Cl− anions with selectivity ratios of over 100 and conduct monovalent cations up to 5 times more rapidly than divalent cations. Surprisingly, the observed K+/Cl− selectivity persists in pores even as large as about 20 nm in diameter, suggesting that high throughput, highly selective graphene electrodialysis membranes can be fabricated without the need for subnanometer control over pore size. Nature Publishing Group 2016-04-22 /pmc/articles/PMC4844701/ /pubmed/27102837 http://dx.doi.org/10.1038/ncomms11408 Text en Copyright © 2016, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| repository_type |
Open Access Journal |
| institution_category |
Foreign Institution |
| institution |
US National Center for Biotechnology Information |
| building |
NCBI PubMed |
| collection |
Online Access |
| language |
English |
| format |
Online |
| author |
Rollings, Ryan C. Kuan, Aaron T. Golovchenko, Jene A. |
| spellingShingle |
Rollings, Ryan C. Kuan, Aaron T. Golovchenko, Jene A. Ion selectivity of graphene nanopores |
| author_facet |
Rollings, Ryan C. Kuan, Aaron T. Golovchenko, Jene A. |
| author_sort |
Rollings, Ryan C. |
| title |
Ion selectivity of graphene nanopores |
| title_short |
Ion selectivity of graphene nanopores |
| title_full |
Ion selectivity of graphene nanopores |
| title_fullStr |
Ion selectivity of graphene nanopores |
| title_full_unstemmed |
Ion selectivity of graphene nanopores |
| title_sort |
ion selectivity of graphene nanopores |
| description |
As population growth continues to outpace development of water infrastructure in many countries, desalination (the removal of salts from seawater) at high energy efficiency will likely become a vital source of fresh water. Due to its atomic thinness combined with its mechanical strength, porous graphene may be particularly well-suited for electrodialysis desalination, in which ions are removed under an electric field via ion-selective pores. Here, we show that single graphene nanopores preferentially permit the passage of K+ cations over Cl− anions with selectivity ratios of over 100 and conduct monovalent cations up to 5 times more rapidly than divalent cations. Surprisingly, the observed K+/Cl− selectivity persists in pores even as large as about 20 nm in diameter, suggesting that high throughput, highly selective graphene electrodialysis membranes can be fabricated without the need for subnanometer control over pore size. |
| publisher |
Nature Publishing Group |
| publishDate |
2016 |
| url |
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4844701/ |
| _version_ |
1613570828288393216 |