Graphene, still cool stuff. (This time a graphene oxide membrane to be exact.)
Quote:
When a metal container was sealed with such a film, even the most sensitive equipment was unable to detect air or any other gas, including helium, leaking through.
But when the researchers tried the same with water, they found that it evaporated without noticing the graphene seal. Water molecules diffused through the graphene-oxide membranes with such a great speed that the evaporation rate was the same whether the container was sealed or open.
...
Dr Nair said: "Just for a laugh, we sealed a bottle of vodka with our membranes and found that the distilled solution became stronger and stronger with time. Neither of us drinks vodka but it was great fun to do the experiment."
...
"The properties are so unusual that it is hard to imagine that they cannot find some use in the design of filtration, separation or barrier membranes, and for selective removal of water."
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http://www.bbc.co.uk/news/science-environment-16747208