In-situ measurement of temporal changes in thickness of polymer adsorbed films from lubricant oil by vertical-objective-based ellipsometric microscopy
In-situ measurement of temporal changes in thickness of polymer adsorbed films from lubricant oil by vertical-objective-based ellipsometric microscopy
复制标题
通过基于垂直物镜的椭圆光显微镜原位测量润滑油中聚合物吸附膜厚度的时间变化
DOI：
10.1016/j.triboint.2021.107341
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发表时间：
2021
影响因子：
6.2
通讯作者：
Naoki Azuma
中科院分区：
文献类型：
--
作者：
Yuxi Song;Kenji Fukuzawa;Shintaro Itoh;Hedong Zhang;Naoki Azuma
了解添加剂形成的吸附膜的形成机理和构象对于阐明边界润滑特性是至关重要的。在这项研究中，我们利用基于垂直物镜的椭圆偏振显微镜(VEM)测量固体表面之间的纳米间隙，提出了一种原位测量润滑油中添加剂吸附膜厚度的新方法。在该方法中，通过测量由添加剂膜填充的固体之间的间隙来测量吸附膜厚度。成功观察了聚甲基丙烯酸烷基酯(PAMA)聚合物添加剂吸附膜的形成过程。此外，根据聚合物的相对分子质量和浓度的不同，PAMA吸附膜具有两种不同的构象：扁平的单层构象和双层构象。
Understanding the formation mechanism and conformation of the adsorbed film formed by additives is critical to clarify the boundary lubrication characteristics. In this study, using the vertical-objective-based ellipsometric microscope (VEM), which can measure nm-gaps between solid surfaces, we proposed a new method for in-situ measuring the thickness of additive adsorbed film in the lubricant oil. In this method, the adsorbed film thickness was measured by measuring the gap between the solids, which was filled by the additive film. The formation process of polyalkylmethacrylate (PAMA) polymer additive adsorbed film was successfully observed. Moreover, we revealed that the PAMA adsorbed films adopted two different conformations depending on the molecular weight and concentration of the polymer: the flattened single-layer conformation and double-layer conformation.