Biomimetic Hydrophobic Structures By UV Curing And Property Research

The development of bionics had brought new inspiration for the preparation of superhydrophobic structures.Through researcher’s continuous exploration and design,more and more superhydrophobic structures have been applied in various fields according to their own structural characteristics.The preparations of three-dimensional cross-scale bionic hydrophobic structures by photocuring has become a research hotspot.At present,there are some problems in the preparations of cross-scale structures by photocuring technology in the market,such as high equipment cost and low forming rate.Therefore,a new kind of mask laser interference light curing(MLIP)technology was explored based on the advantages of large area,high efficiency,low cost and high precision which from the laser interference lithography technology,and the advantages of flexible and controllable which from the mask exposure lithographic technology.In addition,bionic shark skin and mastoid structures were made to verify the feasibility of the MLIP technique.The main work of this thesis is as follows:(1)The method was explored based on the mask and laser interference photocuring to fabricate the structure for micro-nano across scales.The mask laser interference photocuring(MLIP)system was constructed,which consist of the mask,laser interference system and photocuring pool.These parameters,such as shape and feature sizes,can be regulated by mask shape,laser energy,photocuring time,and incident light angle.(2)Bionic shark skin structures were fabricated by MLIP technique.According to the structures of shark skin,a series of bionic shark skin structural masks with different characteristic sizes and different spacing distances were designed.Experiments were carried out by different photocuring times and incident light directions at different angles.The morphologies of the different structures were characterized by scanning electron microscope(SEM),and that the feasibility of MLIP technique was proved.(3)Measurement and analysis of structural properties of the bionic shark skin structures.The relations between the wettability and the structural parameters were explored.The results show that the wettability of the bionic shark skin structures can be controlled by the structural parameters,and the maximum contact Angle can reach about102.1°.After the treatment of fluorosilane,the maximum contact angle can arrive at about161.4 °.Secondly,the control of the adhesion force on the structural surface was realized.Compared with the resin plane(632 m N),the minimum adhesion force was reduced to 221 m N,and the rate of adhesion reduction can reach 37.3%-52%.In addition,based on the anisotropy of wetted angle,the effects that solid-liquid tension at the inclined structureon the formation of wetted angle anisotropy were analyzed.Then,the bionic shark skin structure with different inclined angles(30°,45°,60°)was modified by Fluor silane,and these adhesive forces were further decreased from 221 m N,303 m N,244 m N to 63 m N,121 m N and 148 m N,respectively.Finally,the no loss transportations were achieved,which provided a new idea for the preparation of no loss transfer droplet substrate structure in the field of bioengineering.(4)Photocuring experiment of copper net instead of mask.Based on the feasibility of MLIP technique,normal UV light and laser interference beam were used as light sourcesto carry out photocuring experiment on copper net respectively,so as to explore a new and convenient preparation method of large-area bionic hydrophobic structure.The morphology of structure was characterized and then the structural molding was analyzed through scanning electron microscope.Under the normal UV light,the apex structure liked bamboo shoot was fabricated and the maximum contact Angle can reach 101.8°.In addition,the mastoid structure was form under the double beam laser interference,and the maximum contact angle can reach 90.6°.In this word,a method of mask laser interference photocuring(MLIP)to fabricate micro-nano cross-scale structures was proposed,and the fabricating systeam was constructed.By adjusting the system parameters,bionic shark skin structures with different searies was fabricated which verified the feasibility of MLIP.The wettability and adhesion of bionic shark skin structures were explored,and the relationships between wettability and structure morphology were established.The contact models were established to analyze the directional diffusion mechanism of the bionic shark skin structures,and the non-loss transportations of water droplet were realized,prive that the bionic shaek skin structures have the potential application prospects in bioengineering,targeted transfer and condensation surface.