In this work, TiO₂ nanoparticles modified with octadecylamine and dodecyl mercaptan (DDM/ODA@PDA@TiO₂ NPs) are uesd to improve the tribological properties of the white oil. The DDM/ODA@PDA@TiO₂ NPs which are simply prepared by mussel inspired chemistry and the Michael addition reaction can be facilely dispersed in the white base oil. Tribological measurements showed that the dispersion of the white oil containing 3 wt% DDM/ODA@PDA@TiO₂ NPs displays significant reductions in the friction coefficient and wear scar diameter at room temperature and 75°C. Further XPS investigation shows that the favourable tribological properties of DDM/ODA@PDA@TiO₂ NPs are ascribed to the synergistic effect of tribofilm (Fe₂O₃, Fe₃O₄, FeS₂, FeS and FeSO₄) and TiO₂ nanofluids.

中文翻译：

---

双表面活性剂功能化二氧化钛纳米粒子作为润滑油添加剂

在这项工作中，用十八胺和十二烷基硫醇改性的TiO _{2纳米颗粒（DDM/ODA@PDA@TiO 2} NPs）用于改善白油的摩擦学性能。DDM/ODA@PDA@TiO ₂ NPs 是由贻贝启发化学和迈克尔加成反应简单制备的，可以很容易地分散在白色基础油中。摩擦学测量表明，在室温和 75°C 下，含有 3 wt% DDM/ODA@PDA@TiO ₂ NPs的白油分散液的摩擦系数和磨痕直径显着降低。进一步的 XPS 研究表明，DDM/ODA@PDA@TiO ₂ NPs 的良好摩擦学特性归因于摩擦膜（Fe₂ O ₃、Fe ₃ O ₄、FeS ₂、FeS 和 FeSO ₄）和 TiO ₂纳米流体。