The present work aims at the preparation and characterization of a stable soybean natural ester nanofluid using alumina nanofiller, as an alternative to the conventional mineral oil. Stability using UV-Vis spectrophotometer and turbidity meter for various concentrations of nanofluids is reported and analyzed. Natural ester nanofluids with 0.02 wt% nanofiller concentration shows the highest stability. AC breakdown voltage shows a 21.5 and 27.9% increase for unfilled and 0.02 wt% nanofilled natural ester, respectively, when compared to the unfilled mineral oil. An improvement of 5.4 and 14.6% in the thermal conductivity can be observed for unfilled and 0.1 wt% nanofilled natural ester, respectively, when compared to that of unfilled mineral oil.

中文翻译：

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变压器用天然酯纳米流体的稳定性分析与表征

目前的工作旨在使用氧化铝纳米填料制备和表征稳定的大豆天然酯纳米流体，作为传统矿物油的替代品。报告和分析了使用紫外-可见分光光度计和浊度计测量各种浓度的纳米流体的稳定性。具有 0.02 wt% 纳米填料浓度的天然酯纳米流体显示出最高的稳定性。与未填充的矿物油相比，未填充的和 0.02 wt% 的纳米填充天然酯的交流击穿电压分别增加了 21.5% 和 27.9%。与未填充的矿物油相比，未填充的和 0.1 wt% 的纳米填充天然酯的热导率分别提高了 5.4% 和 14.6%。