benzene C-C bond length is 1.39 angstrom, graphene 1.42 angstrom, so like an inscribed circle in a perfect hexagon, anything narrower than 1.20 or 1.229 angstrom diameter would suppose to pass through it. H, He, as well as most 2nd and 3rd row post-transition elements at periodic table have radius (ionic, covalent, atomic).But atoms are not solid, and the upper and lower (or front and back) delocalized electron cloud would act as potential barrier (not necessarily purely coulombic). However in quantum mechanical realm, especially lighter elements can more easily quantum-tunnel. Have there been any comprehensive review on selective atomic/molecular species sieving with PAH/ Graphene sheets? please let me know
Dear Sumit Bhowmick many thanks for asking this very interesting and surprising technical question. There are a number of relevant articles in the chemical literature in which the selective atomic/molecular ieving with graphene sheets is reported. For example, please have a look at the following interesting articles:
Selective Molecular Sieving through Porous Graphene
Article Selective Molecular Sieving through Porous Graphene
This paper has been posted as public full text on RG.
Graphene: An impermeable or selectively permeable membrane for atomic species?
Article Graphene: An impermeable or selectively permeable membrane f...
Graphene-Based Membranes for Molecular Separation
Article Graphene-Based Membranes for Molecular Separation
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