An experimental study and mechanism analysis on improving dispersion stability performance of Al2O3 nanoparticles in base synthetic oil under various mixing conditions
Source abstract
Abstract
The main goal of this study is to improve the dispersion stability of Al2O3 nanoparticles in polyalphaolefin oil to overcome the sedimentation problem of nanoparticles using the addition of oleic acid as a surfactant. Based on the previous single or insufficient research on the preparation conditions of nanolubricating oil, the effects of temperature, ultrasonic duration, ultrasonic power, and nanoparticle/surfactant (oleic acid) concentration on the dispersion stability of Al2O3 nanoparticles (size range of about 50nm) in oil-based solutions were systematically and comprehensively studied in this work. Herein, the preparation conditions were optimized and the stable nanofluids were obtained. The visual observation, UV–Vis spectroscopy, and dynamic light scattering (DLS) analysis were used to evaluate the dispersion stability of the Al2O3 nanoparticles. Moreover, the dispersion state of Al2O3 in PAO6 solution was demonstrated through transmission electron microscopy (TEM) and Fourier transform infrared (FTIR) at a microscopic level, and the mechanism of dispersion stability was analyzed. The results reveal that the thermal method during the synthesis of nanofluids using 50°C temperature improves the dispersion of nanoparticles. The results also exhibited that there is an optimal match between the ultrasonication power and the ultrasonication duration during the synthesis of nanofluids, which affects its dispersion stability. The results showed that 0.4%wt% oleic acid was needed for the nanolubricants containing 0.005wt% and 0.01wt% to achieve excellent dispersion stability, and the stabilization time exceeds 160 days.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Petroleum Processing and Analysis · Enhanced Oil Recovery Techniques · Nanofluid Flow and Heat Transfer
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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