Measurement of Inter-materials forces by Atomic Force Microscopy (AFM) .

通过原子力显微镜 (AFM) 测量材料间的力。

• 批准号: 05452292
• 负责人: ONZAWA Tadao
• 金额: $ 5.38万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452292/
• 关键词: AFM; Adhesion; heatless and pressureless; Bonding; Joining; COMPUTER SIMULATION; Tribology; JKR; Adhesion; DMT; MYD; 凝着力; 原子間力顕微鏡

The adhesional contact between two solids is significant in the fields of tribology and the joining technology. It is also important for the design of surface force apparatuses such as atomic force microscopy (AMF) .In the present study, we propose the modified MYD theory taking account of the stiffness of the measurement system such as the cantilever of atomic force microscopy (AMF) .The total energy is assumed to beE_total=E_elastic+E_interface+E_surface+E_stiffness.where $E_{\rm elastic} $ is the elastic energy of contacting sphere (pin) , $E_{\rm interface} $ is the term for the energy change from surface to interface within the contact region, E_surface is the potential energy between surfaces outside of the contact region and E_stiffness is the contribution by the stiffness of the measurement system.Our approach conforms to the original one in the limit when the stiffness becomes infinite and conforms to the authors prior theory in the limit when the interaction between surfaces are negligible. Furthermore, the present approach conforms to the JKR theory in the limit when the stiffness becomes infinite and the interaction between surfaces are negligible.In the present study, we introduce the AFM to ultra high vacuum chamber which has ion supttering system. After the ion sputtering, the intermaterial forces are measured. The results are discussed with above thory. Not only intermaterial electronic interation, but also the surface roughness and the stiffness of the measurement system affact on the results. In order to understand the adhesion more in terms of material science, the more well defined condition is essential.

两固体间的粘附接触在摩擦学和连接技术中具有重要意义。这对于设计表面力仪器如原子力显微镜（AMF）也很重要。在本研究中，本文提出了一种修正的MYD理论，该理论考虑了测量系统（如AMF悬臂梁）的刚度，总能量为E_total=E_elastic+E_interface+E_surface+E_stiffness，其中E_{\rm elastic} $是接触球（销）的弹性能量，$E_{\rm interface} $是接触区域内从表面到界面的能量变化项，E_surface是接触区域外部的表面之间的势能，并且E_surface是接触区域外部的表面之间的势能。刚度是测量系统刚度的贡献，当刚度变为无穷大时，我们的方法在极限情况下与原方法一致，当刚度变为无穷大时，我们的方法在极限情况下与作者的先验理论一致。表面之间的相互作用可以忽略。此外，在刚度为无穷大且表面间相互作用可忽略的情况下，本方法符合JKR理论。在本研究中，我们将AFM引入到具有离子溅射系统的超高真空室中。在离子溅射之后，测量材料间力。用上述理论对实验结果进行了讨论。测量结果不仅受材料间电子相互作用的影响，而且受表面粗糙度和测量系统刚度的影响。为了从材料科学的角度更好地理解粘附，更好地定义条件是必不可少的。