In this experimental study, nanofluids based on polyethylene-glycol PEG 400 enhanced with zinc and aluminum oxide nanoparticles were studied in terms of pH and electrical conductivity. The nanofluids were found to be stable with a pH in the range 7.45 to 8.90 at ambient temperature. Electrical conductivity was evaluated both at ambient temperature and at heating up to 60 °C and results showed that the nanofluids electrical conductivity increases with temperature and a correlation is proposed. Plus, PEG 400 electrical conductivity variation with temperature was found to be in line with state of the art, while Al₂O₃ addition decreases the electrical conductivity and ZnO nanoparticle have little to no influence. As a conclusion, the variation of electrical conductivity with nanoparticle concentration is not fully understood in the open literature and intense studies are needed in order to fully understand the mechanisms of its variation and predictability.

在本实验研究中，研究了基于锌和氧化铝纳米粒子增强的基于聚乙二醇PEG 400的纳米流体的pH和电导率。发现纳米流体在环境温度下在7.45至8.90的pH范围内是稳定的。在环境温度和加热至60°C时均对电导率进行了评估，结果表明纳米流体的电导率随温度升高而增加，并提出了相关性。另外，发现PEG 400电导率随温度的变化与现有技术一致，而Al ₂ O ₃添加会降低电导率，而ZnO纳米颗粒几乎没有影响。结论是，在公开文献中尚未完全理解电导率随纳米颗粒浓度的变化，并且需要进行深入研究以充分了解其变化和可预测性的机制。