Department of Mechanical Engineering, College of Engineering & Applied Science, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA.
Langmuir. 2011 Apr 19;27(8):4772-9. doi: 10.1021/la200272x. Epub 2011 Mar 29.
We investigate the possibility of Turing-type pattern formation during friction. Turing or reaction-diffusion systems describe variations of spatial concentrations of chemical components with time due to local chemical reactions coupled with diffusion. Turing systems can lead to a variety of complex spatial patterns evolving with time. During friction, the patterns can form at the sliding interface due to the mass transfer (diffusion), heat transfer, various tribochemical reactions, and wear. We present simulation data showing the possibility of such pattern formation. On the other hand, existing experimental data suggest that in situ tribofilms can form at the frictional interface due to a variety of friction-induced chemical reactions (oxidation, the selective transfer of Cu ions, etc.). These tribofilms as well as other frictional "secondary structures" can form various patterns (islands or honeycomb domains). This mechanism of pattern formation can be attributed to the Turing systems.
我们研究了摩擦过程中 Turing 型图案形成的可能性。Turing 或反应扩散系统描述了由于局部化学反应与扩散耦合而导致化学组分的空间浓度随时间变化的情况。Turing 系统可以导致多种复杂的空间模式随时间演化。在摩擦过程中，由于质量传递（扩散）、热传递、各种摩擦化学和磨损，图案可以在滑动界面形成。我们提供了显示这种图案形成可能性的模拟数据。另一方面，现有的实验数据表明，由于各种摩擦诱导的化学反应（氧化、Cu 离子的选择性转移等），在摩擦界面上可以形成原位 tribofilms。这些 tribofilms 以及其他摩擦“二级结构”可以形成各种图案（岛屿或蜂窝状域）。这种图案形成的机制可以归因于 Turing 系统。
