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  • van der Waals dispersion power laws for cleavage, exfoliation and stretching in multiscale, layered systems

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    Author(s)
    Gould, Tim
    Gray, Evan
    Dobson, John F
    Griffith University Author(s)
    Dobson, John F.
    Gray, Evan M.
    Gould, Tim J.
    Year published
    2009
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    Abstract
    Layered and nanotubular systems that are metallic or graphitic are known to exhibit unusual dispersive van der Waals vdW power laws under some circumstances. In this Brief Report we investigate the vdW power laws of bulk and finite layered systems and their interactions with other layered systems and atoms in the electromagnetically nonretarded case. The investigation reveals substantial difference between "cleavage" and "exfoliation" of graphite and metals where cleavage obeys a C2D-2 vdW power law while exfoliation obeys a C3 log D/D0 D-3 law for graphitics and a C5/2D-5/2 law for layered metals. This leads to ...
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    Layered and nanotubular systems that are metallic or graphitic are known to exhibit unusual dispersive van der Waals vdW power laws under some circumstances. In this Brief Report we investigate the vdW power laws of bulk and finite layered systems and their interactions with other layered systems and atoms in the electromagnetically nonretarded case. The investigation reveals substantial difference between "cleavage" and "exfoliation" of graphite and metals where cleavage obeys a C2D-2 vdW power law while exfoliation obeys a C3 log D/D0 D-3 law for graphitics and a C5/2D-5/2 law for layered metals. This leads to questions of relevance in the interpretation of experimental results for these systems which have previously assumed more trivial differences. Furthermore we gather further insight into the effect of scale on the vdW power laws of systems that simultaneously exhibit macroscopic and nanoscopic dimensions. We show that, for metallic and graphitic layered systems, the known "unusual" power laws can be reduced to standard or near standard power laws when the effective scale of one or more dimension is changed. This allows better identification of the systems for which the commonly employed "sum of C6D-6" type vdW methods might be valid such as layered bulk to layered bulk and layered bulk to atom.
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    Journal Title
    Physical Review B: Condensed Matter and Materials Physics
    Volume
    79
    DOI
    https://doi.org/10.1103/PhysRevB.79.113402
    Copyright Statement
    © 2009 American Physical Society. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal link for access to the definitive, published version.
    Subject
    Physical sciences
    Condensed matter modelling and density functional theory
    Chemical sciences
    Engineering
    Publication URI
    http://hdl.handle.net/10072/25423
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    • Journal articles

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