11 documents found, page 1 of 2
Protective coatings for complex organic flexible materials I: characterization ...
Tiss, Belgacem; Martínez-Martínez, D.; Mansilla, C.; Gomes, J. R.; Abreu, C. S.; Pereira, N.; Cunha, L.The escalating imperative to combat the climate change has generated sustainability trends, leading to a rising demands for eco-friendly products. Cork and rubber are versatile materials based or derived from natural sources with various industrial uses and applications. This work represents the first part of a comprehensive investigation focusing on cork, with rubber being the subject of a subsequent paper. Co...
Advanced UV shielding for cork: a comparative study of ZnO and TiO2 films throu...
Tiss, Belgacem; Martínez-Martínez, D.; Mansilla, C.; Cunha, L.This study evaluates the potential of ZnO and TiO2 films produced by magnetron sputtering to protect cork from the ageing effects induced by the solar radiation, particularly its UV component. This approach was validated first by exposure of cork under coated glass, and then extended to coated cork. The variation of color coordinates (L*, a*, b*) after exposure to a sun simulator lamp demonstrated that ZnO film...
Long term degradation kinetics and UV shielding efficiency of TiO2 and ZnO coat...
Tiss, Belgacem; Martínez-Martínez, D.; Mansilla, C.; Baron, E. Le; Disdier, A.; Cunha, L.This work investigates the application of transparent oxide coatings to enhance the UV resistance of rubber and cork, and it explores their degradation kinetics under accelerated UV exposure. Thus, TiO2 and ZnO of varying thicknesses were deposited using magnetron sputtering on both substrates. TiO2 films were amorphous with dense morphology (thickness: 72 ± 3 nm to 130 ± 3 nm), while ZnO films were polycrystal...
Deposition of UV-protective oxide films on complex substrates: cork and rubber
Tiss, BelgacemA cortiça e a borracha, amplamente utilizadas em aplicações do quotidiano, degradam-se sob radiação UV solar, sofrendo descoloração e desgaste mecânico. Para protegê-las, foram depositados filmes finos de TiO₂ e ZnO por pulverização catódica em magnetrão. Ambos os revestimentos apresentaram elevada transparência na região visível, filtrando eficazmente a radiação UV. Para validar a proteção, um filme de ZnO (40...
Enhancing photocatalysis through annealing: unveiling the role of physical prop...
Tiss, Belgacem; Zayoud, W.; Sekrafi, Houssemeddine; Bouguila, N.; Cristea, D.; Croitoru, C.; Velicu, L.; Tiron, V.; Prepelita, P.; Craciun, V.Using spray pyrolysis, silver-doped In2S3 thin films were deposited on pre-heated glass substrates, with varying doping concentrations. Subsequently, these films underwent vacuum annealing at 400 °C for a duration of 2 h. A comprehensive study of their structural, morphological, and optical properties was conducted, revealing homogeneous, compact, crack-free films with polycrystalline tetragonal-phase of In2S3....
Safeguarding cork’s beauty and longevity: innovations in deposition of protecti...
Tiss, Belgacem; Martínez-Martínez, Diego; Mansilla, Catalina; Borges, Joel; Andritschky, M.; Cunha, LuísCork is a sustainable natural material widely used as a wine stopper. However, some other uses, such as wall coverings, flooring, bags and shoes, face UV damage. To mitigate this issue, we explored the deposition of TiO2 and ZnO thin films via magnetron sputtering on glass and cork substrates. Both films displayed uniformity and the lack of any discernible cracks or voids, remained transparent in the visible re...
Protective films on complex substrates of thermoplastic and cellular elastomers...
Martínez-Martínez, D.; Tiss, Belgacem; Glanzmann, L.N.; Wolthuizen, D.J.; Cunha, L.; Mansilla, C.; De Hosson, J.Th.M.Deposition of thin films is an appropriate methodology to enhance the performance of a material by modification of its surface, while keeping the properties of the bulk largely unaffected. However, a practical implementation becomes less straightforward when dealing with sensitive or complex substrates, for instance, those which cannot be subjected to harsh treatments, such as cleaning and etching, or extreme d...
The effects of annealing process on the characteristics of β-In2S3 powder in pe...
Timoumi, A.; Tiss, Belgacem; Zayoud, W.; Sharma, A.; Kraini, M.; Bouguila, N.; Moura, C.; Cunha, L.; Khirouni, K.Due to its significant expansion as a sustainable energy source, the investigation of thin-film-based solar cells is a very important field of research among materials scientists. Nowadays, CdTe based photovoltaic devices are developed using indium sulfide (In2S3) as potential material. This study reports the effect of the annealing temperature, up to 450 °C, on In2S3 physical properties, and the consequences f...
Influence of silver doping on physical properties of sprayed In2S3 films for so...
Tiss, Belgacem; Moualhi, Y; Bouguila, Noureddine; Erouel, M.; Kraini, M.; Alaya, Sahbi; Aouida, S.; Vázquez-Vázquez, C.; Moura, C.; Cunha, LuísA set of silver-doped indium sulphide (In2S3:Ag) thin films were deposited by spray pyrolysis technique, at 350 degrees C, to analyze the effects of the Ag doping on the physical properties of the films. Within the limits of the analyzed dopant concentration, X-ray diffraction (XRD) revealed the polycrystalline nature of the films, crystalizing in the beta-In2S3 cubic phase, regardless the level of doping. Both...
Influence of the physical properties on the antibacterial and photocatalytic be...
Tiss, Belgacem; Moualhi, Youssef; Bouguila, Noureddine; Kraini, Mabrouk; Alaya, Sahbi; Croitoru, Catalin; Ghiuta, Ioana; Cristea, Daniel; Patroi, DeliaSpray pyrolysis was used to deposit indium sulfide (In<sub>2</sub>S<sub>3</sub>) films, with or without silver doping. The films are polycrystalline, and the inclusion of Ag in the In<sub>2</sub>S<sub>3</sub> structure leads to the formation of a solid solution, with the crystallite size of the order of tens of nanometers. In<sub>2</sub>S<sub>3</sub> films exhibit a semiconductive behavior, and the incorporatio...