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Observation of normal-force-independent superlubricity in mesoscopic graphite contacts (1602.02557v4)
Published 8 Feb 2016 in cond-mat.mes-hall
Abstract: We investigate the dependence of friction forces on normal load in incommensurate micrometer size contacts between atomically smooth single-crystal graphite surfaces under ambient conditions. Our experimental results show that these contacts exhibit superlubricity (super-low friction), which is robust against the application of normal load. The measured friction coefficients are essentially zero and independent of the external normal load up to a pressure of 1.67 MPa. The observation of load-independent superlubricity in micro-scale contacts is a promising result for numerous practical applications.
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