Friction Properties of Carbon Nano-Onions from Experiment and Computer Simulations
Friction Properties of Carbon Nano-Onions from Experiment and Computer Simulations
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DOI：
10.1007/s11249-009-9492-9
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发表时间：
2010-01-01
影响因子：
3.2
通讯作者：
Martin, J. M.
中科院分区：
文献类型：
--
作者：
Joly-Pottuz, L.;Bucholz, E. W.;Martin, J. M.
碳纳米洋葱可以被认为是一种新型的有趣的润滑纳米颗粒。作为润滑油添加剂，碳纳米洋葱即使在低温下也能显著降低摩擦和磨损。为了更好地阐明这些过程发生的机制，我们进行了实验和计算相结合的研究。此外，还发现有色的氧化铁纳米颗粒是通过尚不清楚的机制在钢接触的核心产生的。分子动力学模拟表明，在高接触压力下，放置在滑动的类金刚石表面之间的碳洋葱的润滑机理是基于接触区域内滚动和滑动的耦合过程。我们的结论是，大多数碳洋葱在摩擦过程中似乎保持完整，不产生石墨面，这与先前确定的MoS2富勒烯的行为相反，MoS2富勒烯主要在接触区内剥落，释放出h-MoS2的润滑片层。
The carbon nano-onion can be considered as a new kind of interesting lubricating nanoparticle. Used as lubricant additives, carbon nano-onions lead to a strong reduction of both friction and wear, even at low temperature. To better elucidate the mechanisms by which these processes occur, coupled experimental and computational investigations are carried out. In addition, it is found that lubricious iron oxide nanoparticles are generated in the core of the steel contact through mechanisms that are not yet known. The molecular dynamics simulations of carbon onions placed between sliding diamond-like carbon surfaces at high contact pressure indicate that the lubrication mechanism of the onions is based on a coupled process of rolling and sliding inside the contact area. We conclude that most of carbon onions seem to remain intact under friction processes and do not generate graphitic planes, which is in contrast to the previously determined behavior of MoS2 fullerenes that are mainly exfoliated inside the contact area and liberate lubricating lamellar sheets of h-MoS2.