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Anomalous Molecular Infiltration in Graphene Laminated

Abstract

Graphene Laminated (GL) coatings formed by stacked Few Layer Graphene (FLG) nanocrystals were deposited on low-density Polyethylene (PE) films by mechanical rubbing technique. The molecular transport through the bilayer membrane was studied by gas phase permeation technique monitoring the CO2, N2 and 2H2 transport flux in transient conditions. Results evidence that transport exhibits anomalous character. Experimental data can be reproduced assuming that penetrant concentration in the GL coating, cint (t), reaches a saturation value cs following a compressed exponential kinetics cint (t) =cs [1-e^(-(λrel t)^β ) ]. The relaxation time τrel=1⁄λrel shows thermally activated behavior and its value increases with the kinetic diameter of the penetrant molecules. The critical exponent, β=1.5±0.1 for CO2 and N2 and β=2.0±0.1 for 2H2, does not change with temperature. Positron Annihilation Lifetime Spectroscopy (PALS) analysis indicate that the average cross-section hg of cavities in the GL coating has comparable size to kinetic diameter σk of the penetrant molecules. Results can be explained by assuming that molecular infiltration in the GL structure occurs in nano-channels having distributed path length where penetrant transport obeys to a configurational diffusion mechanism.

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Publication details

The article was received on 19 Jun 2018, accepted on 08 Aug 2018 and first published on 09 Aug 2018


Article type: Paper
DOI: 10.1039/C8CP03879A
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Anomalous Molecular Infiltration in Graphene Laminated

    R. Checchetto, P. Bettotti, R. S. Brusa, G. Carotenuto, W. Egger, C. Hugenschmidt and A. Miotello, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP03879A

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