Carbon soot (CS) is a contaminant of engine oil, and the interaction between CS and oil additives should be understood. This work investigated the interaction between CS and nano-MoS₂. Results show that adding 0.5% nano-MoS₂ in polyalphaolefin significantly improved the lubricity. However, the lubricity of nano-MoS₂ unexpectedly disappeared after adding 0.5% CS because CS prevented nano-MoS₂ from forming a tribofilm. Interestingly, the lubricity was mostly recovered by ZDDP, which removed the inhibition of CS by helping form a MoS₂-contained tribofilm. Another method was also found to remove the inhibition without the help of ZDDP, that is, replacing nano-MoS₂ with nano-MoS₂/nano-TiO₂ heterostructures. Nano-TiO₂ was immune to soot and could carry nano-MoS₂ into the friction interface by their heterojunction to synergistically form a tribofilm.

Graphical abstract

中文翻译：

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碳烟污染的聚 α 烯烃中纳米 MoS2 润滑性的损失和恢复

碳烟 (CS) 是发动机油的污染物，应了解 CS 与机油添加剂之间的相互作用。_{这项工作研究了CS和纳米MoS 2}之间的相互作用。结果表明，在聚α-烯烃中添加0.5%纳米MoS ₂显着提高了润滑性能。然而，在添加0.5％CS后，纳米MoS ₂的润滑性意外消失，因为CS阻止了纳米MoS ₂形成摩擦膜。_{有趣的是，润滑性大部分是通过ZDDP恢复的，ZDDP通过帮助形成含有MoS 2}的摩擦膜来消除CS的抑制。还发现了另一种无需ZDDP帮助即可消除抑制的方法，即用纳米MoS代替纳米MoS ₂₂ /纳米TiO ₂异质结构。纳米TiO ₂不受烟灰影响，并且可以通过异质结将纳米MoS ₂携带到摩擦界面，协同形成摩擦膜。

图形概要