Makowski Łukasz, Bojarska Zuzanna, Rożeń Antoni
Faculty of Chemical and Process Engineering, Warsaw University of Technology, 00-645 Warsaw, Poland.
Nanomaterials (Basel). 2022 Feb 9;12(4):581. doi: 10.3390/nano12040581.
To enhance oil's tribological and rheological properties, various nano-additives are used. An example of such a nano-additive is nanosized molybdenum disulfide (MoS). Due to its unique properties, MoS-based materials used as lubricants have attracted significant attention. In our previous work, we developed a novel, scalable, and low-cost method for MoS-based materials production using an impinging jet reactor. Hybrid nanostructures based on MoS and carbon nanomaterials (MoS/CNMs) decreased the friction factor of the base oil. In the present study, a mathematical model that accounts for the viscous heating effects in rheograms was formulated. The model was used to interpret the results of rheological measurements conducted for the base oil 10W40 and its mixtures with different nanosized lubricant additives. The model of the non-isothermal Couette flow allowed us to correct the rheograms of the engine oils in the region of high shear rates where viscous heating effects become significant. The temperature correlations for the consistency and flow behavior indexes were proposed. The nanohybrid suspensions of MoS in the base oil were found to have the lowest apparent viscosity at low temperatures, typical for the cold engine startup.
为提高油品的摩擦学和流变学性能，人们使用了各种纳米添加剂。这种纳米添加剂的一个例子是纳米尺寸的二硫化钼（MoS）。由于其独特的性能，用作润滑剂的MoS基材料受到了广泛关注。在我们之前的工作中，我们开发了一种使用撞击射流反应器生产MoS基材料的新颖、可扩展且低成本的方法。基于MoS和碳纳米材料的混合纳米结构（MoS/CNMs）降低了基础油的摩擦系数。在本研究中，建立了一个考虑流变图中粘性热效应的数学模型。该模型用于解释对基础油10W40及其与不同纳米尺寸润滑添加剂的混合物进行的流变测量结果。非等温库埃特流模型使我们能够在粘性热效应变得显著的高剪切速率区域校正发动机油的流变图。提出了稠度和流动行为指数的温度相关性。发现MoS在基础油中的纳米混合悬浮液在低温下具有最低的表观粘度，这对于冷发动机启动来说是很典型的。
