Modeling And Experiments Of Adhesion Forces At Solid-liquid Interfaces For Micromanipulation

The field of human at presention has expanded to the micro areas from macroaspects, such as at present biological engineering must have handled only a few micron-sized free cells. In the field of micro-electromechanical systems (MEMS), the featuresizes decreases, the structure is becoming more complex. Therefore, it is required torealize reliable micron and even smaller size of the object-oriented operation. When thesize of the component or system is less than1mm, the force on surface and the associatedsurface will be greater than the volume force, and appear the scale effect. It can notachieve the operation of microscopic size through action of gravity. It is important toresearch the adhesion mechanism and model in themicro-operation.Based on the use of solid-liquid interface adhesion between the operation schemedesign, this paper has studied the mechanism of operation between objects to forecastand control force between the micro operation tools and objects to provide theoreticalbasis for design microoperation tools by adhesion force.First, the characteristics of the microscale solid and liquid has been simulationanalysed and simplified, and the adhesion force between the plate interface and the ball-flat interface with the liquid medium has been researched during the micro-operation of atypical component plate.Then, the model of the static capillary force and the dynamicviscous force of the two models has been established. And the distance of the fracture ofthe meniscus and the amount of liquid left in the operating tools and objects has beenanalysed during the typically operation.Second, the interface adhesion model has been established using the FLUENTsoftware to simulate the dynamic process of the meniscus in the upward movement of themanipulation tools.The impact parameter of the static capillary force and the dynamicviscous force, respectively, is analyzed to illustrate the influence of parameters on theadhesion of the actual micro-operation.Finally, adhesion measuring system has been established, and different micro-objects of materials are selected to study the effect of the separation speed, solid shape,material and other parameters on the interaction force between solid-solid interface andmeniscus shape. Compared with the theoretical model, the reliability of the measurementmodel has been verified.Based on the analysis of the static capillary force and the dynamic viscous forcebetween the solid-liquid interface, the interaction force between the operating tools andobjects, and the effect on the adhesion force of the parameters have been researched,which provides a theoretical basis for the micromanipulation based on the adhesiondesign of solid-liquid interface.