Discrete Nature of Ultrathin Lubrication Film Between Mica Surfaces
Discrete Nature of Ultrathin Lubrication Film Between Mica Surfaces
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云母表面间超薄润滑膜的离散性质
DOI：
10.1115/1.2831616
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发表时间：
1996
影响因子：
2.5
通讯作者：
Takahisa Kato
中科院分区：
文献类型：
--
作者：
H. Matsuoka;Takahisa Kato
研制了一种能精确测量力和面间距的仪器。利用该仪器测量云母表面间的超薄流体润滑膜厚度。八甲基环四硅氧烷（OMCTS）用作润滑剂。实验结果发现，当膜厚大于10 nm（约为OMCTS分子直径的10倍）时，与常规连续流体润滑理论（EHL理论）吻合较好。然而，当薄膜厚度小于10 nm时，它偏离了理论预测，并且观察到薄膜厚度的离散化。认为这种现象是由溶剂化力（结构力）引起的，在本实验这样的超薄润滑现象中，分子效应是不可忽视的。
A new apparatus which can measure force and separation between surfaces accurately is developed. Ultrathin fluid lubrication film thickness between mica surfaces is measured using this apparatus. Octamethylcyclotetrasiloxane (OMCTS) is used as a lubricant. As a result of the experiment, it is found that when the film thickness is more than about 10 nm (ten times as large as the molecular diameter of OMCTS), there is good agreement with the conventional continuum fluid lubrication theory (EHL theory). In case of film thickness less than 10 nm, however, it deviates from the theoretical prediction and discretization of film thickness is observed. It is considered that this phenomenon is due to the solvation force (structural force), and that the molecular effect cannot be neglected in such an ultrathin lubrication phenomenon as in this experiment.