Nanolubricants are nano fluid, colloidal nanoparticle suspension, which are specially used for machine lubrication of the engine. Nanolubricants exhibit special tribological properties that have potential applications in mainly automotive industries. Performance of an engine is a function of the lubricant being used. A study of rheological behaviors of nanolubricants has been beneficial in understanding the influence of nanolubricants on shear rate and shear stress. This study is concerned with characterization and rheological behavioral studies of five nanolubricants, i.e., SnO₂, TiO₂, Fe₃O₄, CuO and ZnO mixed with engine oil at 1% volume by weight concentration. In this study, the result showed that the shear rate was independent of viscosity confirming the Newtonian behavior of these nanolubricants. Non-linear decrease in the shear viscosity, with the rise of the temperature, was observed as well from the result. This non-linear behavior observed in these nanolubricants open up the potential for high-temperature application of these nanolubricants which would greatly benefit automotive industries.

纳米润滑剂是纳米流体，胶体纳米颗粒悬浮液，专门用于发动机的机器润滑。纳米润滑剂具有特殊的摩擦学性能，在主要汽车工业中具有潜在的应用。发动机的性能取决于所用润滑剂的功能。对纳米润滑剂流变行为的研究有助于理解纳米润滑剂对剪切速率和剪切应力的影响。本研究涉及五种纳米润滑剂SnO ₂，TiO ₂，Fe ₃ O _4的表征和流变行为研究。，CuO和ZnO与发动机油混合，浓度为1％（重量）。在这项研究中，结果表明剪切速率与粘度无关，这证实了这些纳米润滑剂的牛顿行为。从结果还观察到剪切粘度随温度升高而非线性降低。在这些纳米润滑剂中观察到的这种非线性行为为这些纳米润滑剂的高温应用打开了潜力，这将极大地有益于汽车工业。