SUPERHYDROPHOBIC AND SUPERHYDROPHILIC FUNCTIONALIZED SURFACES BY PICOSECOND PULSED LASER TEXTURING

摘要

The study of laser textured surfaces has been carried out in the pursuit of superhydrophobic and superhydrophilic functional surfaces on stainless steel and silicon carbide substrate materials respectively. The theoretical aspects of laser texturing a surface were investigated in order to understand how replication of micro and nanoscale features could be achieved by high intensity picosecond pulsed laser systems. A series of laser parameters, pre-processing, and post-processing steps were developed to achieve contact angles of 152° as well as 0° on stainless steel and silicon carbide substrates respectively. The substrates were used to demonstrate functional characteristics such as water repellency, self-cleaning, water adhesion, and dispersion of water using micro-capillary forces.