Abstract This study investigates the synergistic role of Al2O3/TiO2 hybrid nanomaterials and bis(2-ethylhexyl) phosphate (HDEHP) in polyalphaolefin (PAO6) oil, which are synthesized as highly dispersing nanolubricants for mechanical systems. The preparation process was innovatively optimized by ultrasonicating the prepared nanolubricants in a probe sonicator for different ultrasonication times. The dispersion performance of the nanolubricants was evaluated by visual inspection, UV–visible spectrometry, dynamic light scattering, and zeta potentials. Furthermore, the synergistic interactions on the nanoparticle surfaces were elucidated by a mechanism supported by high-resolution transmission electron microscopy (HRTEM). The nanoparticle surfaces were successfully modified through the strong interaction and adsorption of the functional groups of HDEHP. Critically, the Al2O3/TiO2 hybrid nanolubricants demonstrated satisfying dispersion performance without sedimentation after storage for 70 days, much longer than the stable storage times of the individual nanomaterials. This longevity was attributed to electrosteric stabilization among the nanomaterials. The HDEHP-modified hybrid nanomaterials suggest that novel strategies can guide the future development of engine lubricants.

中文翻译：

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双(2-乙基己基)磷酸酯和Al2O3/TiO2杂化纳米材料在提高纳米润滑剂分散稳定性中的作用

摘要 本研究研究了 Al2O3/TiO2 杂化纳米材料和双（2-乙基己基）磷酸酯（HDEHP）在聚α烯烃（PAO6）油中的协同作用，聚α烯烃（PAO6）油被合成为用于机械系统的高分散纳米润滑剂。通过在探针超声仪中超声处理制备的纳米润滑剂不同超声时间，对制备过程进行了创新优化。通过目视检查、紫外-可见光谱、动态光散射和 zeta 电位评估纳米润滑剂的分散性能。此外，纳米颗粒表面上的协同相互作用由高分辨率透射电子显微镜（HRTEM）支持的机制阐明。通过HDEHP官能团的强相互作用和吸附，成功地修饰了纳米颗粒表面。至关重要的是，Al2O3/TiO2 混合纳米润滑剂在储存 70 天后表现出令人满意的分散性能而不会发生沉淀，远长于单个纳米材料的稳定储存时间。这种长寿归因于纳米材料之间的静电稳定。HDEHP 改性的混合纳米材料表明，新的策略可以指导发动机润滑油的未来发展。这种长寿归因于纳米材料之间的静电稳定。HDEHP 改性的混合纳米材料表明，新的策略可以指导发动机润滑油的未来发展。这种长寿归因于纳米材料之间的静电稳定。HDEHP 改性的混合纳米材料表明，新的策略可以指导发动机润滑油的未来发展。