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Water Transport Confined in Graphene Oxide Channels through Rarefied Effect

Abstract

Understanding the mechanism of water transport inside interlayer between graphene-based plates has tremendous values on theoretical studies and industrial applications. The fluid flow confined in nano-scaled spaces exposes a slip velocity near the wall, which is significantly different from bulk water. Here we propose a model combined classic hydrodynamics with kinetic theory to depict the dependency of the slip effect oxide concentrations of valley plates. The influence of oxidized graphene on water flow is a comprehensive result of slipped boundary, depending on the diffuse reflection coefficient of wall, and shrunken effective passageway caused by the electrostatic interaction between surface oxidation and water molecules. The former effect enhances the water flow, which reduces with the increase of oxide concentration, while the latter is on the contrary. We examined the diffuse reflection coefficient and the shrunken effective passageway at different oxide concentrations of sheets by molecular dynamics simulations and quantitively predict the flux relationship with various concentrations. This work provide a molecular insight of transport process of the confined water and a useful guideline for the design of perfect graphene-derived membrane for desalination.

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Publication details

The article was received on 11 Dec 2017, accepted on 07 Feb 2018 and first published on 08 Feb 2018


Article type: Paper
DOI: 10.1039/C7CP08281A
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Water Transport Confined in Graphene Oxide Channels through Rarefied Effect

    B. Chen, H. Jiang, X. Liu and X. J. Hu, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C7CP08281A

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