7 documents found, page 1 of 1
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...
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...
Influence of magnetron sputtering conditions on the chemical bonding, structura...
Alves, C. F. Almeida; Mansilla, C.; Pereira, L.; Paumier, F.; Girardeau, T.; Carvalho, S.In this work Ta1 − xOx coatings were deposited by DC magnetron sputtering in an Ar + O2 atmosphere. The influence of the oxygen partial pressure on the morphology (SEM), structure (XRD), chemical bonding (XPS), thermal oxidation and optical response (FTIR and spectroscopic ellipsometry) of Ta-based films was study. Cross-section morphology revealed that the increase of oxygen content in the coatings change the ...
Development of antimicrobial leather modified with AgTiO2 nanoparticles for foo...
Carvalho, Isabel; Ferdov, S.; Mansilla, C.; Marques, S.; Cerqueira, M. A.; Pastrana, L. M.; Henriques, Mariana; Gaidau, C.; Ferreira, P.; Carvalho, S.The proposed work aims to functionalize leathers for footwear industry with antimicrobial properties based on AgTiO2 nanoparticles. The synthesis of nanoparticles was carried out by the hydrothermal method with significant advantages in terms of time, energy savings and low cost. Anatase TiO2 nanoparticles with dimensions below 10nm were obtained as observed by X-ray diffraction and transmission electron micros...
Towards a single step process to create high purity gold structures by electron...
Mansilla, C.; Mehendale, S.; Mulders, J. J. L.; Trompenaars, P. H. F.Highly pure metallic structures can be deposited by electron beam induced deposition and they have many important applications in different fields. The organo-metallic precursor is decomposed and deposited under the electron beam, and typically it is purified with post-irradiation in presence of O2. However, this approach limits the purification to the surface of the deposit. Therefore, 'in situ' purification d...