Friction-Induced Pattern Formation and Turing Systems

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• 作者：Vahid Mortazavi ; Michael Nosonovsky
• 刊名：Langmuir
• 出版年：2011
• 出版时间：April 19, 2011
• 年：2011
• 卷：27
• 期：8
• 页码：4772-4779
• 全文大小：1066K
• 年卷期：v.27,no.8(April 19, 2011)
• ISSN：1520-5827

文摘

We investigate the possibility of Turing-type pattern formation during friction. Turing or reaction鈭抎iffusion 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 鈥渟econdary structures鈥?can form various patterns (islands or honeycomb domains). This mechanism of pattern formation can be attributed to the Turing systems.