The Fabrication And Research Of Bio-mimicking Salvinia Superhydrophobic Surface With High Adhesion

Superhydrophobic surfaces with either low or high adhesion have great significance in numerous engineering domains.Getting inspiration from nature creatures is an effective method to produce new materials all the time.In this research,inspired by salvinia,a superhydrophobic surface with high adhesion is fabricated by using the three-phase contact line(TCL)and the adhesion of PDA,adhereing PDA onto nanotips of micro/nanostructured of a superhydrophobic surface.By gafting thermal-responsive craft on the surface,the influence factor of the fabrication of the high adhesive superhydrophobic surface with thermal-responsiveness.The main research contents are as follows:(1)The salvinia-like superhydrophobic surface with high adhension was prepared by immersing a rough superhydrophobic surface in DA solution,forming a hydrophilic patch on the top of the micro/nanostructures on the rough superhydrophobic surface.As the results shown,the PDA adhereing location was controlled by the TCL underwater,and the oxygen in the spaces between the micro/nanostructured promoted the adhesion of PDA.This mehod of preparing salvinia-like surface provided a new idea of the fabrication of superhydrophobic surface with high adhesion.(2)The chemical stability of PDA on the surface was tested in the solitions with different pH values,and the results showed that the PDA was stable in the meutral solution and alkalescence solution.The PDA on smooth Al surface,smooth hydrophobic surface,and superhydrophobic surface was functionalized to endowed the thermal sensitivity by grafting thermal sensitivity molecule chain on PDA by atom transfer radical polymerization(ATRP).The responsive wettability of the surfaces was studied.According to the results,the smooth Al surface with PDA showed responsive wettability with the contact angle of 65° at 20℃ and 85°at 40℃;the other two surface didn’t show responsive wettability with the contact angle no changed.The results implied that the thermal responsiveness was mainly effected by the quantity of the PDA on the surfaces.