Experimental Research Of Machining Nano Structrues On Polymer In Liquid Using The Atomic Force Microsope

Atomic Force Microscope（AFM） has become an essential tool in the field ofnano-science, which is the important method of direct machining nano-structure onpolymer surface. However, the application of AFM tip-based mechanical machining ismainly focus on the detection due to the restriction of processing environment, leadingto the little research on the machining mechanism and characteristics of nanometer-scale liquid-assisted modification of polymer surfaces using AFM. This thesis studiesthe AFM mechanical processing on polymethyl methacrylate (PMMA) andpolycarbonate (PC) surface in liquid. There are three parts of the thesis as following:Firstly, through the typical experiment of machining on the polymer surface in theliquid environment, the tip’s friction force and the material’s elastic recovery wereresearched in the process. By comparing with experimental results in the air to get themechanism of machining on polymer in liquid.Secondly, to acquire the unique machining characteristics in the liquid environment,we did a massive of processing experiments including the line scratch and wear box,employing the single factor analyze method machining the two kinds of polymerPMMA and PC, which are in air and in liquid respectively. The main purpose is to findthe relationship between the experimental parameters just like the force, feed rate,machining direction and the processing results such as the height, roughness, weardebris.Finally, on the basis of the machining mechanism and characteristics in the liquid,we did some research on tip wear and soft material that adhere to the tip through plentyof machining experiments. By using a pyramidal silicon tip to cut into the polymersurface forming the line and box nano-structures, we not only analyzed the effects ofsliding distance and normal load on the tip wear volume and rate, but also studied theimpacts of tip shape and tip radius on the structure result. Exploring the liquidenvironment in the processing of machining polymers to reduce tip wear.