In situ tribometry with real-time imaging for assessing durability and wear mechanisms of easy-to-clean coatings on glass for touchscreen substrates |
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| Affiliation: | 1. Department of Engineering Physics, Polytechnique Montreal, Montreal, Quebec H3C 3A7, Canada;2. Corning Inc., Corning, NY 14830, USA;1. Department of Electronics and Communication Engineering, NIT Kurukshetra, India;2. Department of Computer Science and Engineering, IIT Roorkee, India;3. School of Electrical Sciences, IIT Bhubaneswar, India;1. School of Physics and Technology and Center for Electron Microscopy, Wuhan University, Wuhan 430072, PR China;2. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;3. School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, PR China;1. College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, Henan Province 454000, China;2. Henan Key Laboratory of Coal Green Conversion, Henan Polytechnic University, Jiaozuo, Henan Province 454000, China;3. School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100000, China;1. Department of Mechanical and Materials Engineering, The University of Western Ontario, London, Ontario, N6A 5B9, Canada;2. Faculty of Applied Medical Sciences, Department of Medical Laboratory Technology, King Abdulaziz University, P. O. Box 80402, Jeddah, 21589, Saudi Arabia;3. Special Infectious Agents Unit, King Fahd Medical Research Centre, King Abdulaziz University, P. O. Box 80402, Jeddah, 21589, Saudi Arabia;4. King Abdulaziz Univ, Dept Phys, Fac Sci, Jeddah, 21589, Saudi Arabia;5. King Abdulaziz Univ, Advances Composites Synth & Applicat Grp, Jeddah, 21589, Saudi Arabia;1. Key Laboratory of Photo-electronic Materials, Ningbo University, Ningbo, Zhejiang, 315211, China;2. Department of Physics, Dalian Maritime University, Dalian, Liaoning Province, 116026, China;3. Ningbo Institute of Materials Technology and Engineering, The Chinese Academy of Sciences, Ningbo, Zhejiang, 315211, China |
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| Abstract: | Touchscreens are now commonplace around the world, and easy-to-clean (ETC) coatings are integral in ensuring an enhanced usability and interactivity with these devices. In the present work, we evaluate the durability and study the wear mechanisms of a fluorine-containing easy-to-clean coating on glass using an in situ tribometer (TribTik). The TribTik is equipped with a microscope lens and camera system that allows one to image, in real time, the contact area between the glass substrate and the abrading counterpart. Through this unique combination, the instantaneous coefficient of friction and the contact area’s status can be monitored and correlated in situ. The in situ monitoring enables one to stop the abrasion cycles at critical stages of the wear process so that the morphology and composition of the wear tracks can be examined in an effort to understand the wear mechanisms of the ETC. We demonstrate that changes in the instantaneous coefficient of friction (COF) are correlated with changes in the in situ images. Critical stages of wear evolution are also identified via optical microscopy, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and Raman analyses. The evolution of the ETC wear mechanism, from start to finish, was found to be described by the following sequence: (1) generation of unconsolidated debris, (2) formation of a layered tribofilm, (3) cracking of the tribofilm, and (4) general failure of the ETC and subsequent damage to the underlying glass substrate. Our study shows that, TribTik, a tribometry system with real-time imaging capability, is a powerful tool to characterize the tribological properties of coatings on touchscreens and/or display substrates. |
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| Keywords: | Perfluoropolyether (PFPE) Easy-to-clean (ETC) coating Durability Wear mechanism Abrasion test |
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