Fabrication Of Micro/Nano Composite Structure Superhydrophobic Surface And Investigation Of Microdroplet Rolling/Adhesion

As an important parameter to describe the interaction between liquid and solid surface,adhesion has very broad application prospects.In recent decades,the superhydrophobic surface special solid-liquid adhesion in industry,microfluidics and biological sciences have great theoretical and practical teaching significance,such as microfluidic device structure,coating the windshield and ocean going vessels,artificial vessels and so on.At present,the study of the rolling/adhesion of the droplets on the superhydrophobic surface has attracted much attention.However,the study on the rolling/adhesion of the droplets on the superhydrophobic surface is rarely reported.In the superhydrophobic antifog and rain proof system,it is inevitable to produce small droplets and small droplets due to sputtering.The droplets are easily adhered to the solid surface due to the large internal pressure.In order to prevent the adhesion of microdroplets,it is necessary to study the rolling and adhesion of the droplets on the superhydrophobic surface.In this paper,several types of superhydrophobic films were prepared by a simple method,and the effects of droplet size,surface morphology and chemical composition on the rolling/adhesion of superhydrophobic surfaces were investigated.The main research contents are as follows:1.Nano silicon dioxide/epoxy resin composite superhydrophobic coating was prepared by spin coating method.The method is simple,the cost is low,and the prepared composite film has good hydrophobicity.The coating is subject to certain damage(such as knife,adhesive tape),still maintain the characteristics of superhydrophobic,and the coating can be applied to different substrate,can be used for corrosion protection of metals,easy mass production,in most areas have a very important application value.The highlight of this chapter is the surface modification of epoxy group containing reactive nano silicon dioxide to participate in the curing reaction of epoxy resin,so that the nano silicon dioxide embedded on the surface of epoxy resin.2.Superhydrophobic cobaltosic oxide films were prepared by a simple solution immersion method and self-assembly method.Using the solution immersion method by controlling the reaction time of different morphology,mainly have three kinds of different morphologies of cobaltosic oxide micro/nano composite structure,the micro/nano composite structure in the stearic acid modified showed excellent superhydrophobicity.The effects of droplet size and surface morphology on the rolling/adhesion of superhydrophobic surfaces were investigated.3.With the lotus leaf as the template,the nano silicon dioxide/polyvinyl chloride(PVC)composite superhydrophobic film was prepared by the soft template method.Because the surface modification of alkyl chain of silicon dioxide nanoparticles with good hydrophobicity,it added not only can increase the surface structure of the roughness of the sample also reduced the surface energy,the formation of the two necessary conditions for the preparation of superhydrophobic materials.We change the content of hydrophobic silicon dioxide nanoparticles to change the hydrophobic nano silicon dioxide/polyvinyl chloride composite superhydrophobic film,and study the impact of droplet size and surface chemical composition of rolling/adhesion on superhydrophobic surface.This method is simple and does not require complex equipment.It has a wide range of applications in the field of microfluid transmission and lossless transportation.