Browsing by Author "Fernández Adell, José Ignacio"

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    Hierarchical surface texturing increases the contact-killing effect of marine bacteria Pseudomonas sp. on 316 L Stainless steel
    (2025) Castillo Lagos, Javiera Camila; Ramos Moore, Esteban; Castañeda Parra, Erik Alexander; Díaz, Donovan; Fernández Adell, José Ignacio; Vargas Cucurella, Ignacio Tomás; Pizarro Puccio, Gonzalo E.
    Bacterial attachment to material surfaces can lead to biofilm formation and corrosion, causing severe economic and health problems. Understanding the first step is crucial to proposing a surface that prevents bacterial adhesion and even obtaining bactericidal effects. In this study, photolithography and wet etching were used to texture stainless steel 316 L surfaces with a hierarchical pattern. The effects of texturing on the surfaces were characterized using atomic force microscopy, X-ray photoelectron spectroscopy, glow discharge optical emission spectroscopy, and contact angle analyses. Antimicrobial properties were assessed using a live/dead test performed on Pseudomonas sp. isolated from a marine environment. Our main results highlight that texturing using hierarchical patterns promotes changes in the chemical surface, wettability behavior, and antimicrobial response, highly depending on the length scale of the patterns.
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    Tailoring of titanium dioxide thin film in dual radiofrequency plasma enhanced pulsed laser deposition
    (2025) Villegas Dissett, Rodrigo Benjamín; Tomlinson Cornejo, Matías Paul; Ureta De La Fuente, Valentina Isidora; Carrasco Navarro, Camilo Antonio; Miranda, Maximiliano; Fernández Adell, José Ignacio; Saavedra, Daniel; Retamal, María José; Inestrosa-Izurieta, Maria Jose; Singh, Dinesh Pratap; Angel Figueroa, Felipe Alfonso; Volkmann, Ulrich Georg; Takamura, Yayoi; Bhuyan, Heman
    Efficient and cost-effective methods to create photovoltaic materials are constantly being sought, with metal oxides like TiO2 playing a key role in this field. In this study, TiO2 thin films were grown on glass substrates using a dual radiofrequency (RF) plasma-enhanced pulsed laser deposition (PLD) system with a thermal budget that remained below 400 °C. The physical, chemical, and optical properties of the deposited thin films were studied as a function of low- and high-RF powers as well as deposition time. These parameters were found to impact the proportion of anatase and rutile phase and their crystallinity, as well as the oxygen vacancy concentration and band gap energy. These findings demonstrated the utility of dual RF plasma-enhanced PLD for precise modulation of TiO2 thin-films, offering promising applications in photovoltaics and photocatalysis