| Summary: | 碩士 === 國立成功大學 === 奈米科技暨微系統工程研究所 === 100 === Since our technology get into the field of micro/nano scale. The research of micro/nano mechanics has become very prosperous. Especially in the semiconductor industries, biomedical, chemical engineering, precision machinery and microelectromechanical systems(MEMS), micro/nano mechanics have a variety of applications in these fields. In micro/nano scale, the behavior of two surfaces during contact, such as: friction, lubrication and adhesion properties, under the macroscopic contact theory will be different. Meniscus force in micro/nano mechanics is very much affected. Paticularly in some of the biomechanics of the meniscus surface capillary force between elastic objects were particularly large, and the relevant elastic objects meniscus surface capillary force model as hard objects between the meniscus surface force model perfect. Therefore, this study has established an application in the meniscus surface force model between elastic objects, and its rough surface contact.
In this thesis, we establish a meniscus surface capillary force model a rigid sphere and the elastic plate with the different contact situation. By this model, we can see that the value of the meniscus force between two surfaces, in particular the sphere and plate contact and the elastic deformation of the case. We can calculate the adhesion force between the sphere and plate, there are many factors that affect adhesion, including the Young's modulus of the curvature radius of the sphere and plate, or the liquid film surface tension and the contact angles of ball and plate. When sphere radius of curvature increase, the adhesion force becomes more obvious. Plate’s Young's modulus of the opposite, the lower the Young's modulus, adhesion force, the more obvious, and the greater the amount of deformation. The greater the surface tension of the liquid film, the greater the adhesive force; contact angle of the sphere increases, the adhesion force will increase slightly. Flat contact angle increases, the adhesion force but it will slightly reduced. With these relationships, we can model application of different degree of exposure of the meniscus surface force in the roughness statistics. And then of Greenwood-Williamson model to calculate the size and influence factors of the meniscus surface generated by the capillary force between two rough surface adhesion. We found that the adhesion phenomenon between two rough surfaces separated by less than 10nm, the more obvious, but the rough surface spacing is greater than 10nm, adhesion force between the two plate will reduce.
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