Precise and Ultrafast Molecular Sieving Through Graphene Oxide Membranes
摘要：
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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关键词：
Theoretical or Mathematical, Experimental/ graphene laminates membranes molecular sieves nanoporous materials solvation/ ultrafast molecular sieving graphene oxide membranes nanometer pores low frictional water flow micrometer-thick laminates vacuum filtration graphene oxide suspensions dry state nanocapillaries CO/ A6140G Structure of powders and porous materials A8265F Film and membrane processes ion exchange dialysis osmosis, electro-osmosis A8230N Association, addition, and insertion/ CO/bin C/bin O/bin
DOI：
10.1126/science.1245711
被引量：
年份：
2014
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