Collaborative Research: Experimental and Multi-Scale Modeling Investigation of Atomic Lattice Stick-Slip Friction

R.W. Carpick，威斯康星大学麦迪逊分校；wing Kam Liu，西北大学纳米技术正在引领结构和功能在原子尺度上控制的材料和器件的快速发展，其中许多器件涉及滑动界面。这项工作的智力价值将是确定原子粘滑的基本原因和影响，这是纳米尺度滑动的关键特征。我们将使用具有良好特征的样品和尖端的原子力显微镜。通过合作，实验将与多尺度建模相结合，该模型考虑了实验中使用的相同材料在接触中的变形场。我们将讨论可通约性、速度和温度依赖性、振动特性的作用以及通过控制粘滑运动显著减少摩擦的可能性等关键问题。更广泛的教育和社会影响包括综合教育和推广工作，利用我们每个机构的高效项目。

Proposal Number 0409449 Proposal Title Collaborative Research: Experimental and Multi-Scale Modeling Investigation of Atomic Lattice Stick-Slip Friction R.W. Carpick, University of Wisconsin-MadisonWing Kam Liu, Northwestern UniversityNanotechnology is leading to the rapid development of materials and devices whose structure and function are controlled at the atomic scale, and many such devices involve sliding interfaces. The intellectual merit of this work will be to determine the fundamental causes and effects of atomic stick-slip, which is a key feature of nanoscale sliding. We will use atomic force microscopy with well-characterized samples and tips. Through collaboration, experiments will be coupled to multiscale modeling that takes into account the deformation field in the contact for the same materials used in the experiment. We will address the key questions of commensurability, velocity and temperature dependence, the role of the vibrational properties, and the possibility of dramatically reducing friction by controlling stick-slip motion. The broader educational and societal impact involves an integrated education and outreach effort that leverages highly effective programs at each of our institutions.