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

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(a) TEM Dark Field image of a FIB cross-section of a ta-C coating after lubrication test in glycerol (from ref. 44). The optical diffractogram shows the position of the diaphragm on the (002) ring. A sp²-carbon rich film is visible at the top surface; (b) schematic view of surface chemistry and hardness changes occurring on the surface of the ta-C coating after the lubrication test.