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The performance of polymer-based membranes for gas separation is currently limited by the Robeson limit, stating that it is impossible to have high gas permeability and high gas selectivity at the same time. We describe the production of membranes based on the ability of graphene oxide (GO) and poly(ethyleneimine) (PEI) multilayers to overcome such a limit. The PEI chains act as molecular spacers in between the GO sheets, yielding a highly reproducible, periodic multilayered structure with a constant spacing of 3.7 nm, giving a record combination of gas permeability and selectivity. The membranes feature a remarkable gas selectivity (up to 500 for He/CO2), allowing to overcome the Robeson limit. The permeability of these membranes to different gases depends exponentially on the diameter of the gas molecule, with a sieving mechanism never obtained in pure GO membranes, in which a size cutoff and a …
American Chemical Society
Publication date: 
9 Mar 2018

Davide Pierleoni, Matteo Minelli, Simone Ligi, Meganne Christian, Sebastian Funke, Niklas Reineking, Vittorio Morandi, Ferruccio Doghieri, Vincenzo Palermo

Biblio References: 
Volume: 10 Issue: 13 Pages: 11242-11250
ACS applied materials & interfaces