Studies of Friction and Adhesion in Nanoscale Asperity-Asperity Contacts

纳米级粗糙体-粗糙体接触中的摩擦和粘附研究

• 批准号: 1131361
• 负责人: James Batteas
• 金额: $ 29.77万
• 依托单位: Texas A&M Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1131361&HistoricalAwards=false
• 关键词: Studies; Friction; Adhesion; Nanoscale; Asperity

Advanced technologies such as microelectromechancial systems (MEMS) devices, suffer considerably from friction and adhesion due to the large surface to volume ratios of their components, limiting their practical applications. The goal of this grant is to develop molecular based approaches for lubrication schemes to address these challenges and advance the fundamental understanding of lubrication in MEMS. Mixed monolayer films proffer the potential of providing modest friction modification, with integrated molecules that can also function as mobile lubricant phases under contact. In this grant we will explore how mixed monolayer systems can be exploited to solve key issues in the lubrication of MEMS devices through the precise control of surface interactions by systematically tuning surface chemical composition. These fundamental experimental studies are paired with molecular dynamics simulations of the contacts, as well as large scale tribometry measurements to allow us to explore these phenomena over a range of length scales (nm ? ìm) and timescales (ps ? s). New techniques for exploring the asperity-asperity contacts that dominate microdevices, using tip enhanced Raman spectroscopy (TERS), will also be developed, where friction/adhesion and the corresponding local chemical changes at interfaces will be probed concomitantly.If these studies are successful, the development of mixed monolayer schemes for MEMS devices may enable active device technologies to reach production status. The students working on this project (both graduate and undergraduate) will receive multidisciplinary training in materials science, engineering, and surface chemistry and physics, developing proficiency in multiple arenas, preparing them for the advanced technology workforce. Aspects of the work will also be incorporated as demonstrations for elementary school students in our Science and Engineering Open House. Collaborative interactions with the University of Florida and Sandia National Labs will also allow students to conduct research in both fundamental and applied settings, as well as both government and academic labs.

诸如微机电系统（MEMS）装置的先进技术由于其组件的大表面与体积比而遭受相当大的摩擦和粘附，从而限制了其实际应用。 这项资助的目标是开发基于分子的润滑方案方法，以应对这些挑战，并推进对MEMS润滑的基本理解。 混合单层膜提供了提供适度摩擦改性的潜力，其中整合的分子也可以在接触下充当移动的润滑剂相。 在这项资助中，我们将探索如何利用混合单层系统，通过系统地调整表面化学成分来精确控制表面相互作用，从而解决MEMS器件润滑中的关键问题。 这些基本的实验研究与分子动力学模拟的接触，以及大规模的摩擦测量，使我们能够探索这些现象在一系列的长度尺度（nm？m）和时间尺度（ps？s）。 利用尖端增强拉曼光谱（TERS），探索微器件中占主导地位的凹凸接触的新技术也将被开发出来，其中摩擦/粘附和相应的界面局部化学变化将被同时探测。如果这些研究成功，MEMS器件的混合单层方案的开发可能使有源器件技术达到生产状态。 从事该项目的学生（包括研究生和本科生）将接受材料科学，工程，表面化学和物理学的多学科培训，在多个领域发展熟练程度，为先进的技术劳动力做好准备。 这项工作的各个方面也将被纳入我们的科学和工程开放日为小学生示范。 与佛罗里达大学和桑迪亚国家实验室的合作互动也将使学生能够在基础和应用环境以及政府和学术实验室进行研究。