Atomistic study of lateral contact stiffness in friction force microscopy |
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| Affiliation: | 1. University of California – Merced, 5200 North Lake Road, Merced, CA 95343, USA;2. The University of Akron, 302 E Buchtel Ave., Akron, OH 44325, USA;1. Department of Endocrinology and Nutrition, Germans Trias i Pujol Health Sciences Research Institute and Hospital, 08916, Badalona, Spain;2. Department of Medicine, Autonomous University of Barcelona, 08193, Barcelona, Spain;3. Immunology Division, Vall d''Hebron Research Institute (VHIR), Vall d''Hebron University Hospital, 08035, Barcelona, Spain;4. Immunology Department, Germans Trias i Pujol Health Sciences Research Institute, 08916, Badalona, Autonomous University of Barcelona, Spain;5. Statistics Department, Faculty of Biology, University of Barcelona, 08028, Barcelona, Spain;6. Statistics and Bioinformatics Unit, Vall d''Hebron Research Institute (VHIR), 08035, Barcelona, Spain;7. CIBER of Diabetes and Associated Metabolic Diseases (CIBERDEM), Instituto de Salud Carlos III (ISCIII), 28029, Madrid, Spain;8. CIBER of Rare Diseases (CIBERER), Instituto de Salud Carlos III (ISCIII), 28029, Madrid, Spain;1. BioProducts Laboratory, Central Leather Research Institute, Adyar, Chennai 600020, India;2. Department of Biomedical Genetics, Vellore Institute of Technology, Vellore 632 014, India;1. Faculty of Mechanical Engineering, Brno University of Technology, Czech Republic;2. CEITEC - Central European Institute of Technology, Brno University of Technology, Czech Republic;3. Faculty of Medicine and Dentistry, Palacký University Olomouc, Czech Republic;1. College of Science, South China Agricultural University, Guangzhou 510642, China;2. Department of Optoelectronic Engineering, Jinan University, Guangzhou 510632, China;3. Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China;1. Australian National University, College of Engineering and Computer Science, Canberra, ACT 0200, Australia;2. Federation University Australia, Faculty of Science and Technology, School of Engineering and Information Technology, Ballarat, Mt Helen, VIC 3353, Australia;3. Palacký University, Faculty of Science, Department of Mathematical Analysis and Applications of Mathematics, 17. listopadu 1192/12, Olomouc, Czech Republic |
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| Abstract: | The effective stiffness of a friction force microscope tip–substrate system is an important parameter that describes the relationship between lateral force and elastic deformation. In this study, we use a multi-spring model to simplify the system, where two contributions, the tip apex stiffness and the lateral contact stiffness, are discussed in detail. Molecular dynamics simulations are used to characterize stiffness by simulating a tip apex subject to shear or sliding over a substrate surface. The results show that, although the height of the tip apex and tip–substrate orientation affect the various stiffness contributions, the contact itself dominates the overall compliance. |
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| Keywords: | Atomic friction Contact stiffness Molecular dynamics simulation |
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