Abstract Improved lubrication parameters of lubricating oils due to the addition of carbon nanotubes (CNT) have been demonstrated in the past. This benefit, however, is short-lived due to self-induced re-agglomeration of CNTs in large concentrations in the oil. In this work the authors investigate the friction effects at trace amounts of CNT (as low as 0.03%). At such level the re-agglomeration effects are efficiently suppressed. Surprisingly, at such extreme low CNT concentration levels, a relatively large engine friction reduction of 6% was still observed. Moreover, a very strong vibration reduction of up to 30% was measured in the fired engine test. Full understanding of these results will require extensions/revisions of the existing models, which will pave the way to a new class of improved lubricants.

中文翻译：

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用润滑油中的微量碳纳米管减少摩擦和发动机振动

摘要 过去已经证明，由于添加碳纳米管 (CNT) 可以改善润滑油的润滑参数。然而，由于油中高浓度 CNT 的自诱导重新聚集，这种好处是短暂的。在这项工作中，作者研究了痕量 CNT（低至 0.03%）的摩擦效应。在这样的水平上，再聚集效应被有效地抑制。令人惊讶的是，在如此极低的 CNT 浓度水平下，仍然观察到 6% 的相对较大的发动机摩擦降低。此外，在发动机点火测试中测得的减振幅度高达 30%。对这些结果的充分理解将需要对现有模型进行扩展/修改，这将为新类别的改进润滑剂铺平道路。