Tribology studied using atomically smooth surfaces
Tribology studied using atomically smooth surfaces
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使用原子级光滑表面研究摩擦学
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
S. Granick
中科院分区：
文献类型：
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作者：
J. V. Alsten;S. Granick
据报道，对由 1 至 6 层分子厚的非极性液体润滑剂薄膜引起的边界层摩擦进行了研究。液体被限制在平行的无台阶白云母单晶之间。 1 Hz（剪切速率小于 250 sec−1）下的表观动态粘度比各向同性液体的表观动态粘度显着增强，并且随着净法向压力的增加而显着增加。随着净法向压力的增加，发生向类固体响应的转变，但厚度没有明显变化。对完成滑动的临界剪切应力的研究表明，这种静摩擦会随着时间从几分钟到几小时不断累积。对于十六烷薄膜，临界剪切应力的压力系数约为 2 至 20，具体取决于每个正常压力下允许的平衡时间。这些润滑剂膜的摩擦学行为似乎并没有反映润滑剂本身的材料特性，而是源于......
An investigation is reported of the boundary layer friction resulting from films of nonpolar liquid lubricants, 1 to 6 layers of molecules thick. The liquids were confined between parallel step-free single crystals of muscovite mica. The apparent dynamic viscosity at 1 Hz (shear rate less than 250 sec−1) was considerably enhanced over that of the isotropic liquids and increased substantially with increasing net normal pressure. A transition to a solid-like response occurred with increasing net normal pressure, without discernible change in thickness. Investigations of the critical shear stress to accomplish sliding showed a buildup of this static friction over times from minutes to hours. For films of hexadecane, the pressure coefficient of the critical shear stress was approximately 2 to 20, depending on the equilibration time allowed at each normal pressure. The tribological behavior of these lubricant films did not appear to reflect material properties of the lubricants as such, but rather to stem, fro...