Controlling the stainless steel surface wettability by nanosecond direct laser texturing at high fluencesGregorčič, Peter (Avtor) Šetina, Barbara (Avtor) Hočevar, Matej (Avtor) surface engineeringlaser microstructuringsurface functionalizationThis work investigates the influence of the direct laser texturing at high fluences (DLT-HF) on surface mor - phology, chemistry, and wettability. We use a Nd:YAG laser (gamma= 1064 nm) with pulse duration of 95 ns to process stain- less steel surface. The surface morphology and chemistry after the texturing is examined by using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and electron backscatter diffraction (EBSD), while the surface wettability is evaluated by measuring the static contact angle. Immediately after the texturing, the surface is superhydrophilic in a saturated Wenzel regime. However, this state is not stable and the superhydrophilic-to-superhy - drophobic transition happens if the sample is kept in atmos- pheric air for 30 days. After this period, the laser-textured stainless steel surface expresses lotus-leaf-like behavior. By using a high-speed camera at 10,000 fps, we measured that the water droplet completely rebound from this superhydro- phobic surface after the contact time of 12 ms.21072017-12-04 08:51:05Delo ni kategorizirano98469UDK: 535(045)ISSN pri članku: 0947-8396DOI: 10.1007/s00339-017-1392-5COBISS_ID: 15750427OceCobissID: 14196007sl