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首页> 外文期刊>Langmuir: The ACS Journal of Surfaces and Colloids >Adsorption of Organic Friction Modifier Additives
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Adsorption of Organic Friction Modifier Additives

机译：有机摩擦改性剂添加剂的吸附

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Organic friction modifier additives (OFMs) are surfactant molecules added to engine oils to reduce friction in the boundary lubrication regime. They are thought to work by forming an absorbed layer, which provides low friction. This paper studied the relationship between the adsorption of OFMs and their friction and wear-reducing properties in a rubbing contact formed by a stationary glass ball and a rotating silicon disk under the boundary lubrication regime. The effect of molecular structure was investigated by using OFMs of various tail saturation and head group chemistry. OFMs tested were oleic acid, octadecylamine, oleylamine, and glycerol monooleate. The thickness of an OFM-adsorbed layer in hexadecane, examined in situ by spectroscopic ellipsometry and quartz crystal microbalance (QCM), depends on the molecular structure and the concentration of the OFM. As expected, the saturated, linear chain gives the thickest film. A critical OFM layer thickness of about 0.6 nm is necessary to achieve low initial and maximum friction. The thicker OFM layers are accompanied by narrower wear tracks, which are rougher than the wider, smoother wear tracks formed with thinner OFM layers. The interplay between the thickness of the OFM layer and wear track surface roughness results in all OFM layers having similar steady state friction. This shows that the apparent effect of OFM depends on the stage of the rubbing test: initially on friction, and then subsequently on surface damage. Despite OFMs and the base oil having similar refractive indices, ellipsometry was found to be a suitable technique for examining the adsorption of OFM additives from an oil-based solution and showed reasonable correlation with QCM results.
机译：有机摩擦改性剂添加剂（OFMS）是加入到发动机油中的表面活性剂分子，以减少边界润滑制度中的摩擦。通过形成吸收的层，他们被认为是通过提供低摩擦的吸收层来工作。本文研究了在边界润滑制度下由固定玻璃球和旋转硅盘形成的摩擦触点的吸附与摩擦和磨损性能之间的关系。通过使用各种尾部饱和和头部化学研究了分子结构的效果。测试的OFMS是油酸，十八烷基胺，油胺和甘油单烯醇。通过光谱椭圆形测定法和石英晶体微稳定（QCM）原位检查的αsm吸附层的厚度取决于分子结构和OFM的浓度。如预期的那样，饱和的线性链给出了最厚的薄膜。需要临界μm层厚度为约0.6nm，以实现低初始和最大摩擦。较厚的OFM层伴随着较窄的磨损轨道，比较宽，更漂亮的磨损轨道更粗糙，具有较薄的层。 OFM层和磨损轨道表面粗糙度之间的相互作用导致具有类似稳态摩擦的所有摩擦层。这表明OFM的表观效果取决于摩擦试验的阶段：最初在摩擦上，然后随后在表面损伤上。尽管使用具有相似折射率的基础油，但省略量被发现是一种适当的技术，用于检查来自油基溶液的OFM添加剂的吸附，并表现出与QCM结果的合理相关性。

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