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. 2017 Apr 12;7:46394. doi: 10.1038/srep46394

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(a) Friction coefficients of the low-sp² and high-sp² a-C models under a contact pressure of 0.5 GPa. Snapshots of the friction simulations for the (b) low-sp² and (c) high-sp² a-C models at 20, 40, 60, 80 and 100 ps.