Quartz Crystal Microbalance Studies of Atomic-Scale Friction

原子级摩擦的石英晶体微天平研究

• 批准号: 9705259
• 负责人: Jacqueline Krim
• 金额: $ 10.5万
• 依托单位: Northeastern University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-07-15 至 1999-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9705259&HistoricalAwards=false
• 关键词: Quartz; Crystal; Microbalance; Studies; Atomic

w:\awards\awards96\num.doc 9705259 Krim This experimental research project focuses on the atomic scale understanding of frictional phenomena, including those at liquid- solid interfaces. A set of experiments involving quartz crystal microbalance (QCM) studies of friction in controlled environmental conditions and well-defined contact geometries will be performed. Some of these seek to explore the fundamental mechanisms of energy transfer at a sliding interface, while others will investigate model lubrication systems which are of relevance to actual engineering applications. One system to be studied consists of selected rare gas and alkane layers sliding on clean (111) metal surfaces. Model lubrication systems under study include atomically-uniform C60 surfaces in contact with a liquid; and hexanes and synthetic lubricants in contact with atomically uniform metal surfaces. In the latter systems properties of interest include the viscosity and slippage of molecularly thin lubricant layers forming immediately adjacent to the surface, topics which are related to the performance of a lubricant in the transition region between elastohydrodynamic and boundary lubrication. %%% This experimental research project is devoted to improving the scientific understanding of friction forces and related heating effects. An understanding of these effects on the basic atomic scale is sought, making use of advanced experimental techniques, including the quartz crystal microbalance (QCM) which can detect single atomic monolayers. The work focuses on mechanisms of energy transfer during sliding friction; and the viscous and elastic properties of liquid lubricants close to a solid surface. Improvements in understanding here can be of great importance, because the range of technology involving mechanical motions is broad and has great economic importan ce. The work is interdisciplinary in its nature and the graduate students in this program will receive an excellent education preparing them for employment in industry, government or education. ***

w:\awards\awards96\num.doc 9705259 Krim 该实验研究项目的重点是原子尺度上对摩擦现象的理解，包括液固界面的摩擦现象。将进行一系列实验，涉及受控环境条件和明确的接触几何形状下的摩擦石英晶体微天平（QCM）研究。 其中一些旨在探索滑动界面能量传递的基本机制，而另一些则将研究与实际工程应用相关的模型润滑系统。一个待研究的系统由在干净的（111）金属表面上滑动的选定稀有气体和烷烃层组成。正在研究的模型润滑系统包括与液体接触的原子均匀 C60 表面； 与原子均匀金属表面接触的己烷和合成润滑剂。 在后一种系统中，感兴趣的特性包括紧邻表面形成的分子薄润滑剂层的粘度和滑移，这些主题与弹性流体动力和边界润滑之间的过渡区域中的润滑剂的性能有关。 %%% 该实验研究项目致力于提高对摩擦力和相关热效应的科学理解。 利用先进的实验技术，包括可以检测单个原子单分子层的石英晶体微天平（QCM），寻求在基本原子尺度上了解这些效应。该工作重点研究滑动摩擦过程中的能量传递机制；以及接近固体表面的液体润滑剂的粘性和弹性特性。 提高对这方面的理解可能非常重要，因为涉及机械运动的技术范围很广，并且具有巨大的经济重要性。 这项工作本质上是跨学科的，该项目的研究生将接受良好的教育，为他们在工业、政府或教育领域的就业做好准备。 ***