20.500.12556/RUL-101645 Vpliv staranja na površinske lastnosti lasersko teksturiranih in kemijsko modificiranih površin Influence of aging on surface properties of laser textured and chemically modified surfaces V zaključni nalogi predstavljam rezultate trimesečnega opazovanja sprememb omočitvenih lastnosti različnih lasersko teksturiranih vzorcev nerjavnega jekla AISI 316L. Spremljala sem omočljivost lasersko teksturiranih vzorcev brez nanosov ter z nanosi epoksidne smole in epoksidne smole z nanovključki FAS-TiO2 pri sobnih pogojih ter pri zmanjšanima zračnem tlaku in vlagi. Z meritvami kontaktnih kotov vodnih kapljic sem določila omočitvene lastnosti površin ter njihovo površinsko energijo. Z optično profilometrijo in vrstično elektronsko mikroskopijo sem analizirala hrapavost in morfologijo površin različno obdelanih vzorcev. Rezultati so pokazali, da lahko superhidrofobnost jekla dosežemo posredno s staranjem lasersko teksturirane površine z ustreznimi parametri ali pa neposredno z nanosi epoksidne smole z nanovključki FAS-TiO2. Zračna tlak in vlaga vplivata na spremembe omočljivosti lasersko teksturiranega jekla brez nanosov, na omočitvene lastnosti lasersko teksturiranih vzorcev z nanosi pa nimata vpliva. Pokazala sem, da je laserska obdelava učinkovita metoda za modifikacijo morfologije površin in s tem njihove omočljivosti. This work presents the results of a three-month observation of wetting properties of differently laser-textured stainless steel AISI 316L. The samples were prepared uncoated, coated with epoxy resin, and with epoxy resin composite with inlcusion of FAS-TiO2 nanoparticles. The measurements were performed on samples kept under ambient conditions, and in conditions with reduced air pressure and humidity. Static water contact angles were measured and surface energy was calculated to evaluate surface wetting properties. Optical profilometry and scanning electron microscopy were used to analyze the roughness and morphology of laser-textured steel surfaces. The results have shown that superhydrophobicity of steel can be achieved either indirectly by aging the appropriately laser-textured surface, or directly by application of the epoxy resin composite with FAS-TiO2 nanoparticles. Ambient conditions have a significant impact on changes of wettability of laser-textured steel without coatings, but they do not affect the aging of additioanlly coated surfaces. I have shown that laser processing is an effective method for modifying surface morphology and, consequently, its wettability. jeklo AISI 316L lasersko teksturiranje polimerne prevleke morfologija omočljivost steel AISI 316L laser texturing polymer coatings morphology wettability true false false Slovenski jezik Angleški jezik Zaključna naloga 2018-06-23 07:45:01 2018-06-23 07:45:05 2022-08-14 03:45:33 0000-00-00 00:00:00 2018 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 87355 3211876 98.pdf 98.pdf 1 C3B3C36893A3457A92D75A0A1967DD22 8bd34c4656b743b4d9dc03d1ba39736222cf79a6499939b698695d1876dac475 57fdfc28-a1b5-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=111773 Fakulteta za matematiko in fiziko 0 0 0