Various applications require surfaces with anti-fingerprint properties. This article reviews the surface properties that govern the fingerprinting process. The achievement of surfaces free of fingerprints deals with the construction of amphiphobic surfaces that repel water and oil. Based on wetting theories, two key parameters (Surface energy and Roughness) show significant effects on surface wettability. We address in this paper, the basic requirements and strategies of designing and manufacturing amphiphobic surfaces using different substrates. The synergetic effect of low surface energy and functional surface morphology leads to reduced wettability, resulting in anti-fingerprint properties. The trends of future investigations and fundamental conclusions are drawn. The remaining challenges and future outlook of this field are also highlighted.
The transport of granular material often generates severe damage. Understanding the correlation between the friction coefficient, particle geometry and wear mechanisms is of primary importance for materials undergoing abrasive wear. The aim of this study is to investigate the effect of particle geometry on wear mechanisms and the friction coefficient. Numerical and analytical simulations and experimental results have been compared. The process to be studied is the scratch made by a rigid cone with different attack angles on a 5xxx aluminium alloy (Al-Mg) flat surface. A scratch test was used and the wear mechanisms were observed for different attack angles. A numerical study with a finite element code was made in order to understand the effect of attack angle on the friction coefficient. The contact surface and the friction coefficient were also studied, and the results compared to the Bowden and Tabor model. The superposition of the numerical, analytical and experimental results showed a better correlation between the wear mechanisms and the friction coefficient. It also showed the importance of the model hypothesis used to simulate the scratch phenomenon.
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