Atomic-scale Friction Research and Education Synergy Hub: Uniting the Tribology Community

1. Approximate scan area Optical Profilometry Scan of Single Crystal MoS2 Experimental Conditions Normal Load = 1mN Sliding Speed = 100 nm/sec Tip Diameter = 200 mm Average Pressure = 150 MPa Track Length = 5 mm Hemispherical diamond tip Atomic-scale Friction Research and Education Synergy Hub:Uniting the Tribology Community Atomic-scale Friction AFRESH Vision • Workshop held in Gainesville November 8 – 9, 2007 • Members of tribology community decided which components of AFRESH will be essential to expand knowledge of atomic-scale friction • Scientific advances and improved understanding of the science of surfaces have demonstrated that friction is not nearly as simple as Amonton’s Law suggests: • FF = FN, where FF is the shear or frictional force, FN is the normal force, and  is a constant termed the friction coefficient • Atomic-scale friction is typically examined using either experimental or computational methods: • Atomic-Force Microscopy (AFM) • Surface Force Apparatus (SFA) • Pin-on-disk microtribometers • Provides a portal for the AFRESH community to: • Share procedural write-ups, movies, detailed data sets from model system to assist experimental reproducibility • Access tools in original and modified forms to facilitate comparison • Learn from recorded lectures, keynote, invited and contributed technical presentations • Collaborate for the creation of standards • Illustrate to all levels of education the fundamentals of atomic-scale friction URL for Wiki-based AFRESH site: http://www.nsfafresh.org AFRESH Bibliography • Compilations of publications that the tribology community finds pertinent to atomic-scale friction • Format enables users to easily navigate existing articles as well as add their own articles • AFRESH supports individual article additions as well as bulk endnote uploads Experimental atomic force microscopy (AFM) and computational density functional theory (DFT) data on the surface properties of molybdenum disulfide (MoS2). This material is known to have low friction in vacuum, making it ideal for use in aerospace applications. The data is from the work of Perry, Sawyer, Phillpot and Sinnott at the University of Florida. • Commenting and rating system allows the journal articles to be discussed and structured hierarchically based on the communities preferences AFRESH Support of Advanced Research • Researchers can use AFRESH for both computational and experimental projects in numerous ways including: • Thorough collection of information on many empirical computational potentials (illustrated at left) • Available tools and descriptions for data analysis (illustrated at right) • Community forums for discussion of desired projects outside of one’s expertise Recent Journal Publications AFRESH Commitment to Education • Compilations of recent publications are available via RSS feeds from numerous tribology journals • Available journals include Wear, Journal of Tribology, Tribology International, Tribology Transactions, and Tribology Letters (illustrated below) • The field of atomic-scale friction is broken down into a hierarchical format for users of all levels of experience and/or education: • Provides easy navigation of pertinent information • Allows for the advancement of knowledge for the tribology community • Educates people outside of the community on important atomic-scale friction topics.