Study On Surface Wettability Of Slip Zone Of Leaf Cage Of Pitcher Plant

Surface wettability is the ability of a droplet to infiltrate a solid surface.Surface superhydrophobicity and surface anisotropy are both important indexes to measure surface wettability.Wettability surface has a broad application prospect in military industry,medical equipment,intelligent manufacturing,aerospace and other fields.At the present stage,the researchers mainly study the wettability of the surface for the bionic functional surface.The surface of the slip zone of the pitcher cage has unique properties such as hydrophobicity and anisotropy,so it has been widely concerned by many scholars and provided many important implications for the study of wettability.However,the influence mechanism of the key characteristic parameters of the surface microstructure on the surface wettability has not been revealed yet.To a great extent,the application of the bionic surface of pitcher plant in engineering practice is limited.Therefore,it is of great significance to study the surface wettability of the slip zone of the pitcher cage.Based on the surface characteristic structure of the slip zone of the pitcher cage,the following studies were carried out in this paper:(1)The NEWVIEW 600 optical surface 3D profilometer of ZYGO Company was used to detect the surface morphology of the sliding zone of pitcher,and the characteristic size parameters of the surface microstructure of the sliding zone of pitcher leaf cage were obtained.According to the wettability theory and the obtained characteristic parameters,and based on the basic principle of bionic morphology similarity,the surface of the slip zone of the pitcher cage was bionically designed.(2)Based on the Wenzel model and Cassie model,a wettability mathematical model for the microstructural surface of the slip zone of the leaf cage was established,and the relationship between the parameters of the microstructural surface of the crescent and the contact Angle was studied.The experimental scheme was optimized by the mathematical model.The microstructural surface of the gliding zone imitated by the pitcher plant was prepared by the rapid processing technology of femtosecond laser two-photon polymerization.At present,in the previous large area processing of this research group,the maximum processing size is 1mm×1mm,which can not meet the actual demand.Therefore,in this paper,a sub-region localization method was proposed to successfully process the microstructural surface of the sliding zone of the living pitcher cage with an area of6mm×6mm,which verified the feasibility of the two-photon polymerization large-area processing technology for the preparation of the bionic design surface.The contact Angle measuring instrument was used to measure the bionic surface by continuous water injection method,and the anisotropy of the bionic surface was confirmed.(3)The contact angles of the bionic surfaces(the crescent microstructure array is60?m? 90?m)were measured,and the contact angles were 102.3° and 152.1°,respectively.The results show that the bionic surfaces meet the requirements of the contact angles of superhydrophobic state.And based on the different density,height,arrangement,crescent arc array processing and crescent microstructure under different parameters,such as direction of contact Angle test,reveals the crescent parameters such as density,height and curved crescent influence law of bionic surface hydrophobicity and crescent arrangement and crescent arc parameters on the influence law of bionic surface anisotropy,It lays a foundation for the further study of the structure with directional water transport.