Atomic-scale Friction Research and Education Synergy Hub (AFRESH)

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 AFRESH Vision • 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) • Quartz-Crystal Microbalance (QCM) • Surface Force Apparatus (SFA) • Pin-on-disk microtribometers • Provide 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 • Interact with the use of messaging, voice and video tools Atomic-scale Friction Research and Education Synergy Hub(AFRESH) Web-based interface envisioned for AFRESH depicting a user-customized environment that allows the simultaneous use of tools, visualization of data, playing of scientific media (in this case a video), real-time collaboration and other capabilities. AFRESH Research • Investigate effective mechanisms for: • Automatically enabling applications as services and creating web-based interfaces for command-line applications in a LAN environment • Automating management of tasks that rely on monitoring, learning, knowledge bases and trigger mechanisms to act upon user requests or actions, and to manage jobs where anomalous behavior is detected • Automating the creation and deployment of virtual appliances that are safe to use and easy to deploy, based on services for VM creation and configuration 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. Layer architecture for AFRESH cyberinfrastructure. Several options are shown for each type of component, the final choice being determined on the basis of user requirements. Goals • Establish an Engineering Virtual Organization (EVO) that provides a vehicle for the atomic-scale friction community to come together to: • Share data • Develop, disseminate and encourage adoption of standards for the performance analysis of both experiments and simulation • Enhance and share computational and theoretical tools • Develop powerful teaching tools and related material • Quickly bootstrap and operate a sustainable effective EVO for a scientific community Development Phases of AFRESH • AFRESH 1.0: deployment of a representative AFRESH-related applications; integration and deployment of complementary web-based content management systems; establishment of requirements, priorities, accounting and use policies. • AFRESH 2.0: incorporation of independently maintained resources, applications with diverse requirements. • AFRESH 2.1: integration of mechanisms to access resources on WAN and conferencing tools. Related Work – Established EVOs • Network for Earthquake Engineering Simulation (NEES) • Collaborative Large-scale Engineering Analysis Network for Environmental Research (WATERS) • National Nanofabrication Users Network • Network for Computational Nanotechnology (NCN) AFRESH will be developed in three phases, starting with a simple fire-walled LAN-based version (1.0), later extended to include campus-wide resources (2.0) and later integrating resources on other campus and national grids (2.1). Sponsors and Acknowledgments Supported by National Science Foundation.