20.500.12556/RUL-186688 Primerjava metod za ovrednotenje obstojnosti z oljem infuziranih spolzkih površin Comparison of methods for durability evaluation of oil-infused slippery surfaces Delo obravnava problematiko preučevanja degradacije spolzkih, z oljem infuziranih površin (t. i. SLIPS) in določanja ustreznih metod za vrednotenje njihove obstojnosti. Namen raziskave je bil ovrednotiti vpliv različnih pogojev izpostavitve površin in določiti parametre, ki kar se da zanesljivo popišejo odpornost na degradacijo. Pri tem smo izdelali štiri različne morfologije površin, pri čemer smo vsako vrsto infuzirali s silikonskim oljem viskoznosti 10 cSt in 100 cSt. Vzorci so bili v fazi testiranja degradacije izpostavljeni temperaturi 100 °C ali 200 °C, oziroma pršenju z vodo. Rezultati so pokazali, da na obstojnost proti degradaciji sočasno vplivajo morfologija površine, obstojnost hidrofobnega sloja, viskoznost olja in pogoji degradacije. Statični kot omočenja se je izkazal kot manj zanesljiv pokazatelj degradacije, medtem ko je bil kot zdrsa konsistenten in primeren za hitro vrednotenje obstojnosti površin. Prav tako je bilo ugotovljeno, da različne viskoznosti olj zahtevajo različne temperaturne teste in različne časovne intervale meritev, saj prenizka temperatura namreč ne omogoča jasnega trenda degradacije. Pršenje se je izkazalo kot učinkovita metoda za vrednotenje obstojnosti na degradacijo, vendar zahteva ustrezno prilagojen čas izpostavitve in več vmesnih meritev zaradi hitrega poteka degradacije. Rezultati tako potrjujejo pomemben vpliv morfologije površine in viskoznosti infuziranega olja na obstojnost površine na degradacijo. The work addresses the degradation of slippery liquid-infused porous surfaces (SLIPS) and the identification of suitable methods for evaluating their durability. The aim of the study was to assess the effects of different exposure conditions and identify parameters that describe degradation resistance as reliably as possible. Four different surface morphologies were fabricated, with each type infused with silicone oil having a viscosity of either 10 cSt or 100 cSt. During degradation testing, the samples were exposed to temperatures of 100 °C or 200 °C, or subjected to water spraying. The results showed that degradation resistance is simultaneously influenced by surface morphology, the stability of the hydrophobic layer, oil viscosity, and degradation conditions. The static contact angle proved to be a less reliable indicator of degradation, whereas the sliding angle yielded consistent results and was suitable for the rapid evaluation of surface durability. It was also found that oils of different viscosities require different temperature tests and measurement intervals, as an insufficiently high temperature does not produce a clear degradation trend. Water spraying proved to be an effective method for evaluating degradation resistance; however, because degradation proceeds rapidly, the exposure time must be appropriately adjusted and more intermediate measurements are required. Overall, the results confirm that surface morphology and the viscosity of the infused oil have a significant effect on an infused surface’s resistance to degradation. spolzke površine infuzirane površine SLIPS obstojnost površin degradacija ovrednotenje obstojnosti slippery surfaces infused surfaces SLIPS surface durability degradation durability evaluation true false false [N. Radoslav] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-09-04 08:31:17 2026-09-04 08:31:20 2026-09-05 04:33:57 0000-00-00 00:00:00 2026 0 Ljubljana 0 XII, 58 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.89:620.1(043.2) 289185 290089219 48923.pdf 48923.pdf 1 3DF1A3BA1BFEC28D13086EB48171846C ea0572fbd524c5c7b1e59e194b3f5d2237cd9ffc6f6fafe94951579a3da5054f 3cc14c2c-a82a-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=246010 Fakulteta za strojništvo 0 0 0