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Breakdown of the Stokes-Einstein water transport through narrow hydrophobic nanotubes

Abstract

In this paper the transport properties of water confined inside hydrophobic and hydrophilic nanotubes are compared for different nanotube radii and densities. While for wider nanotubes the nature of the wall plays no relevant role in the water mobility, for small nanotubes the hydrophobic confinement presents a peculiar behavior. As the density is increased the viscosity shows a huge increase associated with a small increase in the diffusion coefficient. This breakdown in the Stokes-Einstein relation for the diffusion and viscosity was observed for the hydrophobic, but not in the hydrophilic nanotubes. The mechanism underlying this behavior is explained in terms of the structure of water under confinement. This result indicates that some of the features observed for water inside hydrophobic carbon nanotubes can not be observed in other nanopores.

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Publication details

The article was received on 30 Mar 2017, accepted on 19 Apr 2017 and first published on 20 Apr 2017


Article type: Paper
DOI: 10.1039/C7CP02058A
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Breakdown of the Stokes-Einstein water transport through narrow hydrophobic nanotubes

    M. H. Köhler, J. R. Bordin, L. B. da Silva and M. C. Barbosa, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP02058A

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