Observation of depinning phenomena in the sliding friction of Kr films on gold
Observation of depinning phenomena in the sliding friction of Kr films on gold
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金上氪膜滑动摩擦脱钉现象的观察
DOI：
10.1103/physrevb.68.045420
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发表时间：
2003
影响因子：
3.7
通讯作者：
G. Mistura
中科院分区：
文献类型：
--
作者：
A. Carlin;L. Bruschi;M. Ferrari;G. Mistura
用石英晶体微天平研究了原子级Kr薄膜在金表面的滑动摩擦。我们已经观察到尖锐的钉扎过渡分离的低覆盖率区域，其特征在于在固体-流体边界处的滑移，从高覆盖率区域中的膜被锁定到振荡电极。此外，我们诱导滑动的薄膜缓慢增加的振幅的基板振荡。这种去钉扎转变的特征在于当振幅减小回到零时的滞后。这些观察结果已经获得了两个不同的石英板，并在文献中最近报道的类似。不同的实验运行之间的一个更定量的比较表明，这些动态转换的位置是强烈依赖于衬底表面的状态。
We have used quartz crystal microbalance to study the sliding friction of atomically thin Kr films adsorbed on gold. We have observed sharp pinning transitions separating a low-coverage region, characterized by slippage at the solid-fluid boundary, from a high-coverage region where the film is locked to the oscillating electrodes. Furthermore, we have induced sliding of a film by slowly increasing the amplitude of the substrate oscillations. Such a depinning transition is characterized by hysteresis as the amplitude is decreased back to zero. These observations have been obtained with two different quartz plates and are similar to those recently reported in the literature. A more quantitative comparison among the different experimental runs indicate that the location of these dynamical transitions is strongly dependent on the state of the substrate surface.