The sonication technique is one of the effective methods to stabilize nanolubricants. This paper aims to elaborate on the sonication duration's impact on the stability of Al₂O₃-Polyol ester nanolubricants. A two-step method has been performed to prepare nanolubricants. Each sample consisted of a nanoparticle mixed with POE using a magnetic stirrer without surfactant for 30 min. All samples had the same volume concentration, namely 0.02 vol% but received different interlude sonication duration treatments for 0, 40, 60, 80, 100, and 120 min. FESEM with Energy Dispersive X-Ray was used to characterize the Al₂O₃ nanoparticle sample's morphology and element analysis. UV Visible and absolute zeta potential were used to determine Al₂O₃-POE nanolubricants stability. The findings show that the most optimal sonication impact in this study is 80-min sonication. It proofed by the highest absorbance ratio among other samples, which is 0.411, the lowest drop absorbance value, which is 58.9%, and and with a zeta potential value of 45 mV. The rheological behavior analysis shows that Al₂O₃-POE nanolubricants show Newtonian behavior.

超声技术是稳定纳米润滑剂的有效方法之一。本文旨在阐述超声处理持续时间对Al ₂ O _{3 -}多元醇酯纳米润滑剂稳定性的影响。已经进行了两步法来制备纳米润滑剂。每个样品由与 POE 混合的纳米颗粒组成，使用磁力搅拌器搅拌 30 分钟，不含表面活性剂。所有样品具有相同的体积浓度，即 0.02 vol%，但接受不同的间断超声处理持续时间为 0、40、60、80、100 和 120 分钟。带有能量色散 X 射线的 FESEM 用于表征 Al ₂ O ₃纳米颗粒样品的形态和元素分析。紫外可见光和绝对 zeta 电位用于测定铝₂ O ₃ -POE 纳米润滑剂的稳定性。结果表明，本研究中最佳的超声处理效果是 80 分钟的超声处理。它证明了其他样品中最高的吸光度比为0.411，最低的吸光度值为58.9％，zeta电位值为45 mV。流变行为分析表明，Al ₂ O ₃ -POE纳米润滑剂表现出牛顿行为。