Graphene oxide was used as charge able to confer high selectivity to the final product. A self-assembling technique, namely layer-by-layer has been developed to stratify graphene-based coating on polymeric films; this coating is composed by nanolayers of graphene oxide alternated with polymers, bonded each other by electrostatic forces. Permeability measurement on layered Matrimid®, a commercial polyimide, showed incredibly high selectivity values to small particle mixtures, as O2, CO2, He and H2. Through simple post-treatments the selective performance was also improved, as demonstration of potentiality of the well-ordered bi-dimensional system: improvement on the coating would make this material one of the viable solution for industrial separations, e.g. hydrogen purification in sustainable energy production. A further investigation on similar structures obtained by other strategies shall demonstrate the peculiar mechanism occurring in this material for high selective performance.
Structure and sieving mechanism of high selective graphene-based membranes
Davide Pierleoni, Matteo Minelli, Simone Ligi, Vittorio Morandi, Vincenzo Palermo, Ferruccio Doghieri; Structure and sieving mechanism of high selective graphene-based membranes. AIP Conf. Proc. 11 July 2018; 1981 (1): 020156. https://doi.org/10.1063/1.5046018
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