Experimental Research On Formation Of Superhydrophobic PTFE By Ultrafast Laser-induced Surface Modification

Surface wettability is an important feature, especially in recent years, greater than 150°of ultra-hydrophobic surface has aroused great concern, because it has many critical applications in self-cleaning materials, microfluidic devices, and biological materials. Surface wettability can be controlled by build or change the surface micro-structure and the modification of surface at the same time. Wetting mode conversion on the surface is an important part of the study to design the super-hydrophobic surface preparation and application of research. This article describes the use of femtosecond laser processing of Teflon. Experiments using 1KHz femtosecond pulse (Pulse Width 130fs, central wavelength 800nm) on PTFE micromachining, laser intensity and by analyzing the relationship between the ablation area, fitted PTFE ablation threshold of 18.33 J/cm2. Using SEM, AFM observation of the ablation pits after ablation and found a clear extruded structure, and makes the surface super-hydrophobic properties. Using energy analysis and geometric analysis of the droplet and the super-hydrophobic surface contact state analysis to discuss the super-hydrophobic surface hydrophobic liquid conversion phenomena and laws of the state, that the conditions for the stability of super-hydrophobic state.