Journal
SCIENCE
Volume 343, Issue 6172, Pages 752-754Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1245711
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Funding
- European Research Council
- Royal Society
- Engineering and Physical Research Council (UK)
- National Natural Science Foundation (China)
- Marie Curie Fellowship
- Leverhulme Trust
- Bluestone Global Tech
- EPSRC [EP/K016946/1, EP/K005014/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K016946/1] Funding Source: researchfish
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Graphene-based materials can have well-defined nanometer pores and can exhibit low frictional water flow inside them, making their properties of interest for filtration and separation. We investigate permeation through micrometer-thick laminates prepared by means of vacuum filtration of graphene oxide suspensions. The laminates are vacuum-tight in the dry state but, if immersed in water, act as molecular sieves, blocking all solutes with hydrated radii larger than 4.5 angstroms. Smaller ions permeate through the membranes at rates thousands of times faster than what is expected for simple diffusion. We believe that this behavior is caused by a network of nanocapillaries that open up in the hydrated state and accept only species that fit in. The anomalously fast permeation is attributed to a capillary-like high pressure acting on ions inside graphene capillaries.
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