Friction classically decreases with decreasing load. Nanoscale measurements on chemically modified graphite now show an opposite trend related to local deformation, which could serve as a probe for determining the exfoliation energy of layered materials.
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Wahl, K. Positively 'negative' friction. Nature Mater 11, 1004–1005 (2012). https://doi.org/10.1038/nmat3494
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DOI: https://doi.org/10.1038/nmat3494