1. Breaking free from PFAS : biocompatible, durable and high-performance octenyl succinic anhydride (OSA)-modified starch/chitosan coating with ZnO for textile applicationsAnja Verbič, Blaž Stres, Ivan Jerman, Barbara Golja, Ema Žagar, Vuk Martinović, Petja Logar, Gregor Lavrič, Anže Prašnikar, Blaž Likozar, Uroš Novak, Ana Oberlintner, 2025, izvirni znanstveni članek Povzetek: The development of textile coatings as alternatives to per- and polyfluoroalkyl substances (PFAS) is a high priority due to global regulatory efforts aiming to phase out PFAS, driven by alarming environmental contamination and significant human health concerns. To address the urgent need for replacements, this research develops a health-friendly hydrophobic coating for two of the most common textile substrates, cotton and polyester. The developed coating, consisting of chitosan matrix and octenyl succinic anhydride-modified starch in synergy with ZnO, achieved water contact angles up to 132°. A successful transition to industrial application provided a translucent and homogeneous hydrophobic protection, without noticeably affecting the material's physical properties. Maintained or improved mechanical properties, supported by FTIR analysis, indicate a benign coating process that provides fiber reinforcement. Durability is demonstrated through multiple washing cycles without decrease in hydrophobicity, and high abrasion resistance (min. 20,000 cycles), winning against its commercial fluorinated counterpart. The water-repellent properties show stability over a longer period of time (min. 230 days). The biodegradability study confirmed the environmental compatibility as the biopolymer coating decomposed in 8 days. Finally, multivariate statistical analysis determined an optimal coating process to ensure effective integration of the newly developed sustainable coating into textile manufacturing processes.
Ključne besede: chitosan, octenyl succinic anhydride, modified starch, biopolymer, hydrophobic coating, functional textile
Objavljeno v DiRROS: 20.06.2025; Ogledov: 529; Prenosov: 335
 Celotno besedilo (6,58 MB)
Gradivo ima več datotek! Več... |
2. Light-assisted catalysis and the dynamic nature of surface species in the reverse water gas shift reaction over ▫$Cu/\gamma-Al_2O_3$▫Kristijan Lorber, Iztok Arčon, Matej Huš, Janez Zavašnik, Jordi Sancho-Parramon, Anže Prašnikar, Blaž Likozar, Nataša Novak Tušar, Petar Djinović, 2024, izvirni znanstveni članek Povzetek: The reverse water gas shift (RWGS) reaction converts CO2 and H2 into CO and water. We investigated Cu/γ-Al2O3 catalysts in both thermally driven and light-assisted RWGS reactions using visible light. When driven by combined visible light and thermal energy, the CO2 conversion rates were lower than in the dark. Light-assisted reactions showed an increase in the apparent activation energy from 68 to 87 kJ/mol, indicating that light disrupts the energetically favorable pathway active in the dark. A linear correlation between irradiance and decreasing reaction rate suggests a photon-driven phenomenon. In situ diffuse reflectance infrared Fourier transform spectroscopy and TD-DFT analyses revealed that catalyst illumination causes significant, partly irreversible surface dehydroxylation, highlighting the importance of OH groups in the most favorable RWGS pathway. This study offers a novel approach to manipulate surface species and control activity in the RWGS reaction.
Objavljeno v DiRROS: 19.12.2024; Ogledov: 757; Prenosov: 449
Celotno besedilo (1,87 MB)
Gradivo ima več datotek! Več... |
3. |
4. |
5. |
6. |
7. |
8. |
9. Mechanisms of copper-based catalyst deactivation during CO [sub] 2 reduction to methanolAnže Prašnikar, Andraž Pavlišič, Francisco Ruiz-Zepeda, Janez Kovač, Blaž Likozar, 2019, izvirni znanstveni članek Ključne besede: catalyst deactivation, methanol synthesis, deactivation mechanism, modelling
Objavljeno v DiRROS: 24.11.2020; Ogledov: 2686; Prenosov: 1622
Celotno besedilo (4,46 MB)
Gradivo ima več datotek! Več... |
