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.
Published Version
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