28 documents found, page 1 of 3
Tribological behaviour of antimicrobial surfaces for orthopaedics and oral reha...
Veloso, Jorge; Borges, Joel; Vaz, Filipe; Carvalho, Oscar; Souza, Julio; Gomes, J. R.Inflammatory reactions around implants and prosthetics can occur due to the accumulation of pathogenic bacteria species. The long-term success of implants and prostheses depends on the healthy state of surrounding mucosa, bone, and connective tissues, that can be controlled by manufacturing surfaces with specific physical-chemical aspects to prevent the accumulation of bacteria. Among several properties, the fr...
Influence of plasmonic thin-film-coated photobioreactors on microalgal biomass ...
Pereira, Francisco; Vicente, A. A.; Vaz, Filipe; Borges, Joel; Geada, Pedro Miguel MacedoMicroalgae emerge as an eco-friendly solution for food, feed, pharmaceutical, energy, and environmental remediation, providing a diverse range of valuable biocompounds to address the growing global demand. However, light conditions pose substantial challenges, limiting their photosynthetic efficiency and productivity. Light concentration and manipulation provided by plasmonic effects, coupled with photobioreact...
Long-term hydrophilic PDMS surfaces using Brij L4: A simple and robust approach...
Minas, Graça; Pinho, Diana; Borges, Joel; Vaz, Filipe; Zille, Andrea; Lima, Rui Alberto Madeira MacedoPolydimethylsiloxane (PDMS) is a widely used material in the production of microfluidic devices and biomodels, due to its exceptional mechanical, chemical and biocompatible properties. Recently, a novel class of devices known as microphysiological systems have emerged, combining microfluidic technology and cell culture, mimicking the microphysiological features of the human body to facilitate the study of both ...
Polydimethylsiloxane surface modification of microfluidic devices for blood pla...
Gonçalves, Margarida; Gonçalves, Inês Maia; Borges, Joel; Faustino, Vera Luísa Carreira; Soares, Delfim; Vaz, Filipe; Minas, GraçaOver the last decade, researchers have developed a variety of new analytical and clinical diagnostic devices. These devices are predominantly based on microfluidic technologies, where biological samples can be processed and manipulated for the collection and detection of important biomolecules. Polydimethylsiloxane (PDMS) is the most commonly used material in the fabrication of these microfluidic devices. Howev...
Nanoplasmonic Au:CuO thin films functionalized with APTES to enhance the sensit...
Proença, Manuela; Rodrigues, Marco S.; Moura, C.; Machado, A. V.; Borges, Joel; Vaz, FilipeCarbon monoxide (CO) is a highly flammable and toxic gas to humans and animals, that's why its detection and monitoring are crucial. A promising technique to develop a robust and cheap gas sensor, operating at room temperature, is Localized Surface Plasmon Resonance (LSPR) sensing. However, LSPR sensing of inorganic gas molecules, such as CO, is challenging due to their extremely small differences in refractive...
Classification of real-world objects using supervised ml-assisted polarimetry: ...
Pereira, Rui M. S.; Oliveira, Filipe; Romanyshyn, Nazar; Estevez, Irene; Borges, Joel; Clain, Stephane; Vasilevskiy, MikhailWe study the problem of classification of various real-world objects using as input a database (DB) of laboratory polarimetric measures (Mueller matrix elements—MMEs). It can work as a complementary technology of surroundings’ imaging that can be used, in particular, in autonomous driving. To this end, we look for an algorithm using less input parameters without great loss of the quality of classification. We s...
Critical issues on the surface functionalization of plasmonic Au-Ag/TiO2 thin f...
Costa, Diogo; Pereira-Silva, Patrícia; Sousa, Paulo Jorge Teixeira; Pinto, Vânia Cristina Gonçalves; Borges, Joel; Vaz, Filipe; Minas, GraçaThis work reports on the surface functionalization of a nanomaterial supporting localized surface plasmon resonances (LSPRs) with (synthetic) thiolated oligonucleotide-based biorecognition elements, envisaging the development of selective LSPR-based DNA biosensors. The LSPR thin-film transducers are composed of noble metal nanoparticles (NPs) embedded in a TiO2 dielectric matrix, produced cost-effectively and s...
Recent advances in nanomaterial-based optical biosensors for food safety applic...
Meira, Diana I.; Barbosa, Ana Isabel Ferreira; Borges, Joel; Reis, R. L.; Correlo, V. M.; Vaz, FilipeGlobal population growth tremendously impacts the global food industry, endangering food safety and quality. Mycotoxins, particularly Ochratoxin-A (OTA), emerge as a food chain production threat, since it is produced by fungus that contaminates different food species and products. Beyond this, OTA exhibits a possible human toxicological risk that can lead to carcinogenic and neurological diseases. A selective, ...
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...
Immobilization of Streptavidin on a Plasmonic Au-TiO2 Thin Film towards an LSPR...
Pereira-Silva, Patrícia; Meira, Diana I.; Costa-Barbosa, Augusto; Costa, Diogo; Rodrigues, Marco S.; Borges, Joel; Machado, Ana V.; Cavaleiro, AlbanoOptical biosensors based on localized surface plasmon resonance (LSPR) are the future of label-free detection methods. This work reports the development of plasmonic thin films, containing Au nanoparticles dispersed in a TiO2 matrix, as platforms for LSPR biosensors. Post-deposition treatments were employed, namely annealing at 400 °C, to develop an LSPR band, and Ar plasma, to improve the sensitivity of the Au...