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

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Title
Between scylla and charybdis: Hydrophobic graphene-guided water diffusion on hydrophilic substrates
Author(s)
Kim J.-S.; Choi J.S.; Lee M.J.; Park B.H.; Bukhvalov D.; Son Y.-W.; Yoon D.; Cheong H.; Yun J.-N.; Jung Y.; Jeong Young Park; Salmeron M.
Publication Date
2013-07
Journal
SCIENTIFIC REPORTS, v.3, no., pp.2309 -
Publisher
NATURE PUBLISHING GROUP
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.
URI
http://pr.ibs.re.kr/handle/8788114/1584
DOI
10.1038/srep02309
ISSN
2045-2322
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
Files in This Item:
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