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| 1 | Experimental Study on Molecular Arrangement of Nanoscale Lubricant Films——A Review显示文摘In order to understand lubrication mechanism at the nanoscale, researchers have used many physical experimental approaches, such as surface force apparatus, atomic force microscopy and ball-on-disk tribometer. The results show that the variation rules of the friction force, film thicknessand viscosity of the lubricant at the nanoscale are different from elastohydrodynamic lubrication(EHL). It is speculated that these differences are attributed to the special arrangement of the molecules at the nanoscale. However, it is difficult to obtain the molecular orientation and distribution directly from the lubricant molecules in these experiments. In recent years, more and more attention has been paid to use new techniques to overcome the shortcomings of traditional experiments, including various spectral methods. The most representative achievements in the experimental research of molecular arrangement are reviewed in this paper: The change of film structure of a liquid crystal under confinement has been obtained using X-ray method. The molecular orientation change of lubricant films has been observed using absorption spectroscopy. Infrared spectroscopy has been used to measure the anisotropy of molecular orientation in the contact region when the lubricant film thickness is reduced to a few tens of nanometers. In situ Raman spectroscopy has been performed to measure the molecular orientation of the lubricant film semi-quantitatively. These results prove that confinement and shear in the contact region can change the arrangement of lubricant molecules. As a result, the lubrication characteristics are affected. The shortages of these works are also discussed based on practicable results. Further work is needed to separate the information of the solid-liquid interface from the bulk liquid film. | ZHANG Shaohua LIU Yuhong | 2015 | Chinese Journal of Mechanical Engineering2015，28，5： | 3 |
| 2 | 纳米级正十六烷润滑膜分子排列方式的实验研究显示文摘针对厚度为纳米量级的液体正十六烷润滑膜,在球-盘点接触区内的分子排列结构开展实验研究。采用自行研制的在线测量系统,基于偏振拉曼光谱技术和相对光强膜厚测量技术分析处于不同润滑状态下的润滑膜分子排列结构和成因。结果表明:接触区内十六烷静态液膜的分子主链平行于固体表面,但在摩擦平面内的取向随机分布;较低速度下液膜分子排列结构与静态液膜相近;进入弹流润滑状态后,液膜分子排列结构呈无序的流体状态;在膜厚处于薄膜润滑阶段时,液膜分子有沿滚动速度方向取向的趋势。 | 张韶华 雒建斌 刘宇宏 | 2015 | 润滑与密封2015，40，12： | 0 |
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