Surface Chemical Effects on the Mechancial Properties of Solids: Combined Experimental and Large Scale Massively Parallel Atomic Level Simulations

表面化学对固体机械性能的影响：实验与大规模并行原子级模拟相结合

• 批准号: 9900278
• 负责人: Sean Corcoran
• 金额: $ 21.01万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-01 至 2003-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9900278&HistoricalAwards=false
• 关键词: Surface; Chemical; Effects; Mechancial; Properties

9900278CorcoranThe objective of this research project is to quantify the changes in nanoscale mechanical properties of metal surfaces under specific electrochemical environments where the surface energy, surface stress, chemical composition and excess surface charge can be precisely controlled. Specifically, in-situ nanoindentation measurements (hardness, elastic modulus, adhesion and indentation creep) will be performed on metallic surfaces as a function of (1) systematically varying the surface stress through electrochemical control of the surface charge, (2) varying the surface energy and stress through the electrochemical deposition of strained metal monolayers as well as the growth of surface oxides, and (3) varying the adhesion between the surface and the surface probe through the use of different probe-sample combinations. These results will lead to a better understanding of the basic mechanisms by which surface chemistry can alter the nanomechanical properties of surfaces. These results are expected to have implications in lubricant development and a basic understanding of friction processes. ***

9900278 Corcoran该研究项目的目的是量化特定电化学环境下金属表面的纳米级机械性能的变化，其中表面能，表面应力，化学成分和过量表面电荷可以精确控制。 具体来说，原位纳米压痕测量（硬度、弹性模量、附着力和压痕蠕变）将在金属表面上进行，作为（1）通过表面电荷的电化学控制系统地改变表面应力，（2）通过应变金属单层的电化学沉积以及表面氧化物的生长改变表面能和应力，以及（3）通过使用不同的探针-样品组合来改变表面和表面探针之间的粘附力。 这些结果将导致更好地理解的基本机制，表面化学可以改变表面的纳米机械性能。 这些结果有望对润滑剂的开发和摩擦过程的基本理解产生影响。 ***