2002 Fiscal Year Final Research Report Summary

Exact reversiblity in joining and separation

Research Project

Project/Area Number	13450292
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Research Field	Material processing/treatments
Research Institution	Tokyo Institute of Technology
Principal Investigator	ONZAWA Tadao Tokyo Institute of Technology, Mechanical and Intelligent Systems Engineering, Prof., 大学院・理工学研究科, 教授 (10016438)
Co-Investigator(Kenkyū-buntansha)	SAITO Shigeki Tokyo Institute of Technology, International Development Engineering, Associate Prof., 大学院・理工学研究科, 助手 (30313349) TAKAHASHI Kunio Tokyo Institute of Technology, International Development Engineering, Associate Prof., 大学院・理工学研究科, 助教授 (70226827)
Project Period (FY)	2001 – 2002
Keywords	adhesion / atomic force microscope / ultra high vacuum / molecular dynamics / chemical bond / interface / electronic spectroscopy / surface analysis
Research Abstract	For the purpose of the zero-emission world or the recycle of materials, the exact reversiblity is examined in the processes in Joining and Separation. A force measurement system constructed in ultra high vacuum chamber of Auger electron spectroscope is used. A piezo device actuator system is introduced in it and control software is programed by Visual C++. Experiments were carried out in the elastic range. After the measurements of adhesion forces, surfaces were observed by scanning electron microscope (SEM) and scannning 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. The results are discussed with the continuum theory and the numerical analysis using molecular mechanics theory. Theoretical strength of adhered object can be deduced by continuum theory. Except for the limit when the size of atoms are 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.