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The understanding of water transport in graphene oxide (GO) membranes standsout as a major theoretical problem in graphene research. Notwithstanding theintense efforts devoted to the subject in the recent years, a consolidatedpicture of water transport in GO membranes is yet to emerge. By performingmesoscale simulations of water transport in ultrathin GO membranes, we showthat even small amounts of oxygen functionalities can lead to a dramatic dropof the GO permeability, in line with experimental findings. The coexistence ofbulk viscous dissipation and spatially extended molecular friction results in amajor decrease of both slip and bulk flow, thereby suppressing the fast watertransport regime observed in pristine graphene nanochannels. Inspection of theflow structure reveals an inverted curvature in the near-wall region, whichconnects smoothly with a parabolic profile in the bulk region. Such invertedcurvature is a distinctive signature of the coexistence between single-particleLangevin friction and collective hydrodynamics. The present mesoscopic modelwith spatially extended friction may offer a computationally efficient tool forfuture simulations of water transport in nanomaterials.

Extended friction elucidates the breakdown of fast water transport in graphene oxide membranes