Abstract
Two experimental approaches for determining the relative contributions of electronic and phononic dissipative mechanisms in sliding friction are discussed. The first involves comparison of electrical resistivity data with that recorded via a quartz crystal microbalance (QCM) technique. The second involves QCM studies of friction levels on clean and precoated metal surfaces. The first technique has been employed to study friction levels in the system H2O/Ag, and the second technique has been employed to study the systems Ar/Ag and Ar/Xe/Ag. We conclude that electronic contributions to friction, long thought to be negligible with respect to phonon contributions, remain very viable as a significant source of energy dissipation. While the resistivity approach may ultimately yield accurate measurements of the electronic contributions to friction, we expect its use to be limited. Surface precoating experiments are meanwhile expected to be of widespread applicability.
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Krim, J., Daly, C. & Dayo, A. Electronic contributions to sliding friction. Tribol Lett 1, 211–218 (1995). https://doi.org/10.1007/BF00209775
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DOI: https://doi.org/10.1007/BF00209775