Analysis of PFPE lubricating film in NEMS application via molecular dynamics simulation |
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| Affiliation: | 1. Institute of High Performance Computing, Singapore S138632, Singapore;2. Department of Mechanical Engineering, National University of Singapore, Singapore S119260, Singapore;3. Department of Mechanical Engineering, Indian Institute of Technology, Kanpur 208016, India;1. Institute of Nanosurface Science and Engineering, Shenzhen University, Shenzhen 518060, China;2. Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China;3. Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan;1. Ocean School, Yantai University, Yantai, 264005, China;2. College of Nuclear Equipment and Nuclear Engineering, Yantai University, Yantai, 264005, China;3. National Center for International Research of Subsea Engineering Technology and Equipment, Dalian Maritime University, Dalian, 116026, China;4. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin, 150080, China;1. Materials Science and Engineering, Texas A&M University, TX 77843, United States;2. Stanford Institute for Materials & Energy Sciences, Stanford University, Menlo Park, CA 94025, United States;3. Mechanical Engineering, Texas A&M University, College Station, TX 77843, United States;1. School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China;2. The State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, China;1. Material Science and Engineering, Sichuan University, Chengdu 610065, China;2. Zigong Zhaoqiang sealing products Industrial Co Ltd, Zigong 643000, China;1. School of Mechanical, Materials Mechatronic and Biomedical Engineering, Faculty of Engineering and Information Sciences, University of Wollongong, Northfield Avenue, Wollongong, NSW, 2522, Australia;2. School of Chemistry and Chemical Engineering & Key Laboratory of Colloid and Interface Chemistry, Shandong University, Jinan, 250100, PR China |
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| Abstract: | Interfacial lubrication plays an important role in the functional performance of nanoelectrome-chanical (NEMS) systems. Here, we used molecular dynamics simulation to analyze the lubricating effect of a perfluoropolyether (PFPE) film to reveal the mechanism behind our experimental observations and understand the performance of the film. There was good agreement in the trends of the coefficients of friction between our simulation results and experimental characterizations. By studying the atomic motion, interfacial mechanics and polymer chain deformation, we found that PFPE films provide good lubrication because their linear flowability promotes surface reconstruction. Our simulations suggest that a high performance lubricant film needs to have low resistance to shear deformation, possess high linear flowability, promote surface reconstruction and adhere effectively to the substrates. |
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