Figure 9.

Friction coefficient curves lubricated by various samples as a function of time under 800 N (a), and 3 D images of the worn surfaces lubricated by samples 1 (b), 2 (c), 3 (d), and 4 (e) under 800 N.

Wang et al. Nanoscale Research Letters 2011 6:259   doi:10.1186/1556-276X-6-259
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