95 documents found, page 1 of 10
Rational Approach to Design Gold Nanoparticles for Photothermal Therapy: the ef...
Ferreira-Gonçalves, T.; Nunes, D.; Fortunato, E.; Martins, R.; de Almeida, A.P.; Carvalho, L.; Ferreira, D.; Catarino, J.; Faísca, P.; Ferreira, H.A.Among the unique characteristics associated to gold nanoparticles (AuNPs) in biomedicine, their ability to convert light energy into heat opens ventures for improved cancer therapeutic options, such as photothermal therapy (PTT). PTT relies on the local hyperthermia of tumor cells upon irradiation with light beams, and the association of AuNPs with radiation within the near infrared (NIR) range constitutes an a...
Screen-printed, flexible, and eco-friendly thermoelectric touch sensors based o...
Figueira, J.; Bonito, R. M.; Carvalho, J. T.; Vieira, E. M. F; Gaspar, C.; Loureiro, Joana; Correia, J. H.; Fortunato, E.; Martins, R.; Pereira, L.Despite the undoubtable interest in energy conversion, thermoelectric (TE) materials can be approached from a temperature-sensitive perspective, as they can detect small thermal stimuli, such as a human touch or contact with cold/hot objects. This feature offers possibilities for different applications one of them being the integration with scalable and cost-effective, biocompatible, flexible, and lightweight t...
An assessment of contact and laser-based scanning of rock particles for railway...
Jerónimo, P.; Resende, R.; Fortunato, E.Performance of traditional railway structure depends significantly on the behaviour of its support layers, particularly the ballast. This layer’s rock particles are selected to ensure high mechanical strength, but traffic and mechanical maintenance break and wear the particles. Consequently, the layer incurs permanent deformations that degrade its strength and increase deformability and permeability. Particle p...
Surface modification of bacterial cellulose membranes for microfluidic applicat...
Silvestre, S. L.; Marques, A. C.; Cristelo, Cecília Silva; Gama, F. M.; Martins, R.; Fortunato, E.Although the great advances in medicine, there are still many limitations related to materials that can interact with the human body and its cells. One of the major challenges is developing biocompatible materials that can be used to skin repair treatments, tissue regeneration, inflammation, and wound treatments, among other problems. The most critical step to explore new materials development still remains in ...
Enhanced UV flexible photodetectors and photocatalysts based on TiO2 nanoplatforms
Nunes, D.; Pimentel, A.; Araujo, A.; Calmeiro, T. R.; Panigrahi, S.; Pinto, J. V.; Barquinha, P.; Gama, F. M.; Fortunato, E.; Martins, R.Abstract: In this study, titanium dioxide (TiO2) nanostructured films were synthesized under microwave irradiation through low temperature synthesis (80 °C) and integrated in ultraviolet (UV) photodetectors and as photocatalysts. Bacterial nanocellulose (BNC), tracing paper, and polyester film were tested as substrates, since they are inexpensive, flexible, recyclable, lightweight, and when associated to low te...
Photogrammetry for digital reconstruction of railway ballast particles – a cost...
Paixão, A.; Resende, R.; Fortunato, E.Ballast aggregate is a natural material widely used in railway lines. Its mechanical properties and particle geometry are meticulously defined using well-established standards and characterisation procedures. Though extensively validated, these procedures have some limitations: they are operator dependent; only provide major particle dimensions; do not inform on surface colour; nor allow for advanced particle w...
Eco-friendly sol-gel derived sodium-based ormolytes for electrochromic devices
Fernandes, M.; Leones, Rita Daniela Barros; Pereira, S.; Costa, A. M. S.; Mano, J. F.; Silva, Maria Manuela; Fortunato, E.; de Zea Bermudez, V.The sol-gel method was employed in the preparation of a novel range of organicinorganic biohybrid electrolytes composed of a di-urethane cross-linked poly(ε- caprolactone) (PCL(530) chains/siloxane doped with different amounts of sodium triflate (NaCF3SO3.xH2O). The samples are semi-crystalline and thermally stable up to ca. 250 ºC. The maximum ionic conductivity (4.1 × 10-7 , 1.5 × 10-4 and 8.8 × 10-4 S cm-1 a...
Estudo do contacto e fecho em descontinuidades rochosas através de digitalizaçã...
Resende, R.; Muralha, J.; Ramos, A. L.; Fortunato, E.As descontinuidades marcam de forma decisiva a deformabilidade e a resistência, mas também a condutividade hidráulica e a transmissão de vibrações em maciços rochosos. Se a medição de certas características do material rochoso é uma tarefa corrente, já a caracterização da topografia das superfícies é difícil de medir e quantificar de forma inequívoca. Trabalhos anteriores empregam métodos de digitalização com e...
Non-linear behaviour of geomaterials in railway tracks under different loading ...
Paixão, A.; Varandas, J.; Fortunato, E.; Calçada, R.The resilient behaviour of the geomaterials used in railway tracks, particularly the ballast layer, is mostly non-linear and depends mainly on the loading stress path. However geomaterials are frequently considered as linear elastic in structural analyses, assuming that it somewhat reproduces the results of non-linear models for a given load amplitude. This study focuses on whether this consideration is adequat...
A numerical study on the stress changes in the ballast due to train passages
Varandas, J.; Paixão, A.; Fortunato, E.; Hölscher, P.At railway bridge approaches the track stiffness may vary rapidly and often differen- tial settlements take place between the stiff structure and the approach section of the track. These differential settlements lead to uneven track profiles and the appearance of voids between the base of the sleepers and the ballast on the approach segment. The ballast and the sub-ballast are the unbound granular materials that...