Figure 1.

The schematic description of the van der Waals interaction between the i-th and j-th atom. Schematic description of (a) the van der Waals interaction between the i-th and j-th atom in the registry-dependent potential approach. A depiction of (b) a top graphite flake (pink) that is moveable relative to a bottom (blue) graphite flake.

Ng et al. Nanoscale Research Letters 2012 7:185   doi:10.1186/1556-276X-7-185
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