20.500.12556/RUL-148662 Vpliv velikosti kapljice na superhidrofobne lastnosti površine The effect of droplet size on superhydrophobic surface properties Superhidrofobne površine so zaradi svojih izjemnih lastnosti, kot sta samočistilnost in vodoodbojnost, predmet številnih raziskav. Njihove aplikacije se uporabljajo na različnih področjih, od avtomobilske industrije in letalstva do medicine, elektronike, tekstilne industrije in gradbeništva. V okviru diplomske naloge smo zasnovali in izdelali merilno progo za ovrednotenje robustnosti superhidrofobnih površin pri povečanju tlaka v kapljevini s stiskanjem vodne kapljice med dvema površinama. V razvojnem okolju MATLAB smo razvili algoritem za strojno obdelavo slik, s katerim smo z obravnavo geometrije stisnjene kapljice določili velikosti tlaka v kapljevini. Za izvedbo meritev smo uporabili bakrene superhidrofobne površine, ki smo jih izdelali z laserskim strukturiranjem in naknadnim nanosom hidrofobizacijskega sredstva FDPA. Z meritvijo velikosti pritisne sile in določitvijo velikosti tlaka med stiskanjem kapljic različnih volumnov med dvema enakima površinama smo ovrednotili vpliv začetne velikosti kapljice. Ugotovili smo, da se je v manjših kapljicah zaradi manjše stične površine s podlago ustvaril večji tlak kot pri večjih kapljicah pri enaki velikosti pritisne sile oziroma pomika površine. Superhydrophobic surfaces are frequent subject of research due to their exceptional properties, such as self-cleaning and water repellency. Their applications are used in various fields such as automotive, aerospace, medical, electronics, textile and construction. As part of the thesis, we built an experimental setup for evaluating the robustness of superhydrophobic surfaces when the pressure in liquid is increased by compressing a water droplet between two surfaces. In the MATLAB development environment, we developed an image processing algorithm, which was used to determine the magnitude of the pressure in the droplet by considering the geometry of the compressed droplet. To perform the measurements, we used copper superhydrophobic surfaces, which were produced by laser structuring and subsequent application of the hydrophobic agent FDPA. By measuring the size of the pressure force and determining the size of the pressure during the compression of drops of different volumes between two identical surfaces, we evaluated the influence of the initial droplet size. We found that, due to the smaller contact surface with the substrate, a greater pressure is created in smaller drops than in comparison with larger drops at the same magnitude of pressure force or displacement of the surface. superhidrofobnost režim omočenja stiskanje kapljic strojna obdelava slik Laplaceov tlak superhydrophobicity wetting state droplet compression image processing Laplace pressure true false false [T. Vrtnik] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2023-08-29 08:30:42 2023-08-29 08:30:45 2024-02-02 13:08:09 0000-00-00 00:00:00 2023 0 Ljubljana 0 XX, 60 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 255170 29127.pdf 29127.pdf 1 D1D792C03FB4B11570B00F68C475FD37 aac152cc3cb5cbd958ae3517a893fff7ffb77c2d031f77dba9c9de70f7af7a3c 9467152e-4635-11ee-a605-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=172953 Fakulteta za strojništvo 0 0 0