Exact reversibility in joining and separation

连接和分离的精确可逆性

• 批准号: 10450267
• 负责人: ONZAWA Tadao
• 金额: $ 3.84万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10450267/
• 关键词: adhesion; atomic force microscope; ultra high vacuum; molecular dynamics; chemical bond; interface; electronic spectroscopy; surface analysis

For the purpose of the zero-emission world or the recycle of materials, the exact reversiblity has to be examined in the processes in Joining and Separation. A force measurement system constructed in ultra high vacuum chamber of Auger electron spectroscope is used. The results are discussed with the continuum theory and the numerical analysis using molecular mechanics theory.Experiments were carried out in the elastic range. After the measurements of adhesional forces, surfaces were observed by scanning electron microscope (SEM) and scanning Auger microscope (SAM). Although the atomic transfer between contacting samples was sometimes observed, there are some cases no transfer could observed by SAM. These results suggest the existence of exact reversible processes in Joining and Separation. .In theoretical approach, theoretical strength of adhered object can be deduced by continuum theory. The solution is exact one and conventional theory and formula were found to be an approximation of it. At the limit when the size of atoms are not negligible, molecular mechanics becomes significant. The modified embedded atom method (MEAM) which is made for the bulk is found to have applicability to surface problems.

为了实现零排放世界或材料的回收利用，必须在连接和分离过程中检查确切的可逆性。利用俄歇电子谱仪超高真空室中的测力系统进行了实验研究。用连续介质理论和分子力学理论的数值分析对结果进行了讨论，并在弹性范围内进行了实验。在测量粘附力之后，通过扫描电子显微镜（SEM）和扫描俄歇显微镜（SAM）观察表面。虽然有时会观察到接触样品之间的原子转移，但也有一些情况下，SAM无法观察到转移。这些结果表明，在连接和分离中存在精确的可逆过程。在理论方法上，可以用连续介质理论推导出被粘物的理论强度。该解是精确解，传统的理论和公式是近似解，在原子尺寸不可忽略的极限下，分子力学才有意义。研究发现，针对体材料的改进嵌入原子方法（MEAM）对表面问题具有适用性。