CUED Publications database

Between scylla and charybdis: Hydrophobic graphene-guided water diffusion on hydrophilic substrates

Kim, J-S and Choi, JS and Lee, MJ and Park, BH and Bukhvalov, D and Son, Y-W and Yoon, D and Cheong, H and Yun, J-N and Jung, Y and Park, JY and Salmeron, M (2013) Between scylla and charybdis: Hydrophobic graphene-guided water diffusion on hydrophilic substrates. Scientific Reports, 3. ISSN 2045-2322

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Abstract

The structure of water confined in nanometer-sized cavities is important because, at this scale, a large fraction of hydrogen bonds can be perturbed by interaction with the confining walls. Unusual fluidity properties can thus be expected in the narrow pores, leading to new phenomena like the enhanced fluidity reported in carbon nanotubes. Crystalline mica and amorphous silicon dioxide are hydrophilic substrates that strongly adsorb water. Graphene, on the other hand, interacts weakly with water. This presents the question as to what determines the structure and diffusivity of water when intercalated between hydrophilic substrates and hydrophobic graphene. Using atomic force microscopy, we have found that while the hydrophilic substrates determine the structure of water near its surface, graphene guides its diffusion, favouring growth of intercalated water domains along the C-C bond zigzag direction. Molecular dynamics and density functional calculations are provided to help understand the highly anisotropic water stripe patterns observed.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:45
Last Modified: 08 Dec 2014 02:12
DOI: 10.1038/srep02309