TFA seems inconsistent with a recent report that graphene is so transparent to water than one can in effect use a graphene barrier to selectively out-diffuse water. (http://biology-forums.com/index.php?topic=18349.0;topicseen) gives a popularized account of the original work that indicates you can concentrate alcohol in alcohol/water solutions by simply putting a graphene film bottlecap on the bottle. Yahoo! for those of us who want to make EverClear from vodka, I guess.
So if this story is talking about using graphene to enable TEM examination of aqueous systems, I don't see why the water doesn't diffuse rapidly out of the graphene bubble boundary, especially given the tiny volumes that would be involved in a TEM specimen.
The graphene water diffusion paper is "Unimpeded Permeation of Water Through Helium-LeakTight Graphene-Based Membranes", paywalled at Science Mag. Really interesting.
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