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    Wetting of Water on Graphene

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    1611.09093v3.pdf
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    Description:
    Preprint
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    Type
    Preprint
    Authors
    Bera, Bijoyendra
    Shahidzadeh, Noushine
    Mishra, Himanshu cc
    Bonn, Daniel
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Environmental Science and Engineering Program
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2016-11-28
    Permanent link to this record
    http://hdl.handle.net/10754/626566
    
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    Abstract
    The wetting properties of graphene have proven controversial and difficult to assess. The presence of a graphene layer on top of a substrate does not significantly change the wetting properties of the solid substrate, suggesting that a single graphene layer does not affect the adhesion between the wetting phase and the substrate. However, wetting experiments of water on graphene show contact angles that imply a large amount of adhesion. Here, we investigate the wetting of graphene by measuring the mass of water vapor adsorbing to graphene flakes of different thickness at different relative humidities. Our experiments unambiguously show that the thinnest of graphene flakes do not adsorb water, from which it follows that the contact angle of water on these flakes is ~180o. Thicker flakes of graphene nanopowder, on the other hand, do adsorb water. A calculation of the van der Waals (vdW) interactions that dominate the adsorption in this system confirms that the adhesive interactions between a single atomic layer of graphene and water are so weak that graphene is superhydrophobic. The observations are confirmed in an independent experiment on graphene-coated water droplets that shows that it is impossible to make liquid 'marbles' with molecularly thin graphene.
    Publisher
    arXiv
    arXiv
    1611.09093
    Additional Links
    http://arxiv.org/abs/1611.09093v3
    http://arxiv.org/pdf/1611.09093v3
    Collections
    Biological and Environmental Science and Engineering (BESE) Division; Preprints; Environmental Science and Engineering Program; Water Desalination and Reuse Research Center (WDRC)

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