Oxygen and hydrogen atoms on the diamond's surface

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Hydrogen and oxygen atoms on diamond surfaces contribute to a low coefficient of friction by passivating dangling bonds, as evidenced by spectroscopic studies. This passivation occurs through a balance of bond-breaking during sliding and the adsorption of gaseous species like water vapor. The effectiveness of this mechanism is influenced by factors such as contact stress, sliding rate, temperature, relative humidity, and reciprocation frequency. The findings support the hypothesis that surface chemistry plays a critical role in friction properties. Overall, the presence of these atoms significantly enhances the performance of ultrananocrystalline diamond in reducing friction and wear.
PatrickP2
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Is it true that hydrogen and oxygen atoms on the surface of diamond make it have such a low coefficient of friction?
 
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From the paper "Origin of ultralow friction and wear in ultrananocrystalline diamond" by AR Konicek, DS Grierson, P Gilbert, WG Sawyer, AV Sumant, RW Carpick (Physical review letters, 100, 235502 (2008)):

“The mechanism of low friction supported by this spectroscopy is passivation of dangling bonds [1,3,4,35]. This is the first definitive spectroscopic evidence supporting the passivation hypothesis. This mechanism hinges on a balance between the processes of bond breaking during each sliding pass (which depends on contact stress, sliding rate, and temperature) and passivation by dissociative adsorption of gaseous species, in particular, water vapor (which depends on RH and reciprocation frequency [36,37]).”
 

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