Tunable sieving of ions using graphene oxide membranes
| Autor: | Sarah J. Haigh, Christopher D. Williams, Eric Prestat, Yang Su, Andre K. Geim, K. S. Vasu, Irina V. Grigorieva, Paola Carbone, James Dix, Rahul R. Nair, Jijo Abraham, Kalon Gopinadhan, C. T. Cherian |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Biomedical Engineering Oxide FOS: Physical sciences Bioengineering 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Ion Sieve chemistry.chemical_compound National Graphene Institute law Molecule General Materials Science Electrical and Electronic Engineering Condensed Matter - Materials Science Water transport Graphene Materials Science (cond-mat.mtrl-sci) Permeation 021001 nanoscience & nanotechnology Condensed Matter Physics 6. Clean water Atomic and Molecular Physics and Optics 0104 chemical sciences Membrane Chemical engineering chemistry ResearchInstitutes_Networks_Beacons/national_graphene_institute 0210 nano-technology |
| Zdroj: | Nature Nanotechnology Abraham, J, Kalangi, V S, Williams, C, Kalon, G, Su, Y, Cherian, C, Dix, J, Prestat, E, Haigh, S, Grigorieva, I, Carbone, P, Geim, A & Raveendran Nair, R 2017, ' Tunable Sieving of Ions Using Graphene Oxide Membranes ', Nature Nanotechnology, vol. 12, pp. 546-550 . https://doi.org/10.1038/nnano.2017.21 |
| ISSN: | 1748-3387 |
| DOI: | 10.1038/nnano.2017.21 |
| Popis: | Ion permeation and selectivity of graphene oxide membranes with sub-nm channels dramatically alters with the change in interlayer distance due to dehydration effects whereas permeation of water molecules remains largely unaffected. Graphene oxide membranes show exceptional molecular permeation properties, with promise for many applications1,2,3,4,5. However, their use in ion sieving and desalination technologies is limited by a permeation cutoff of ∼9 A (ref. 4), which is larger than the diameters of hydrated ions of common salts4,6. The cutoff is determined by the interlayer spacing (d) of ∼13.5 A, typical for graphene oxide laminates that swell in water2,4. Achieving smaller d for the laminates immersed in water has proved to be a challenge. Here, we describe how to control d by physical confinement and achieve accurate and tunable ion sieving. Membranes with d from ∼9.8 A to 6.4 A are demonstrated, providing a sieve size smaller than the diameters of hydrated ions. In this regime, ion permeation is found to be thermally activated with energy barriers of ∼10–100 kJ mol–1 depending on d. Importantly, permeation rates decrease exponentially with decreasing sieve size but water transport is weakly affected (by a factor of |
| Databáze: | OpenAIRE |
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