11 documents found, page 1 of 2
Nanostructured coatings for intraocular devices with drug delivery function
Ferreira, Q.; Bragança, A.; Oliveira, J.; Bioucas-Dias, J.M.; Figueiredo, M. A. T.; Alcácer, L.; Morgado, J.Despite numerous scientific research efforts, ocular drug delivery remains a challenge for scientists due to the problems related to the current methods that are 90% based on eye drops administration. This therapeutics has some limitations such as rapid drug loss, toxic effects on ocular surfaces and poor patient compliance with the drug regimen. Due to these limitations the current research is focused on the d...
Autonomous Wireless Sensor with a Low Cost TEG for Application in Automobile Ve...
Costa, A.; Costa, D.; Morgado, J.; Santos, Helder; Ferreira, Carlos Daniel HenriquesThe present work consists in the development of an autonomous, low cost, reliable, energy scavenger sensor for automotive applications. Thermoelectric generators typically exhibit low efficiency but high reliability, making them suitable for autonomous, low average energy consumption, applications. A prototype sensor was developed for mounting in the engine exhaust pipe using a step-up voltage converter, a micr...
Self-standing chitosan films as dielectrics in organic thin-film transistors
Morgado, J.; Pereira, A. T.; Braganca, A. M.; Ferreira, Q.; Fernandes, S. C. M.; Freire, C. S. R.; Silvestre, A. J. D.; Pascoal Neto, C.; Alcacer, L.Organic thin film transistors, using self-standing 50 gin thick chitosan films as dielectric, are fabricated using sublimed pentacene or two conjugated polymers deposited by spin coating as semiconductors. Field-effect inobilities are found to be similar to values obtained with other dielectrics and, in the case of pentacene, a value (0.13 cm(2)/(V.S) comparable to high performing transistors was determined. In...
Innovative 2D/3D biotextiles for potential bone tissue engineering applications
Almeida, L. R.; Correlo, V. M.; Lisboa, P.; Martins, A. R.; Marques, A. P.; Ribeiro, A. S.; Silva, C.; Sousa, R. A.; Oliveira, A. L.; Reis, R. L.Bone tissue engineering represents a specialised niche within the biomedical field to which textile technologies can markedly contribute. Textile-based technologies are considered as potential routes for the production of scaffolds for TE applications, as they present superior control over design and reproducibility. This work aims at developing novel 2D/3D textile structures based on different polymeric materi...
Application of chitosan in the textile industry to control microbial growth
Tavaria, F. K.; Soares, J.; Oliveira, V.; Silva, R.; Morgado, J.; Malcata, F. X.; Pintado, M. E.
Pavement selection stratagies using Life-Cycle cost analysis
Antunes, M. L.; Marecos, V.; Neves, J.; Morgado, J.Building and maintaining a road network involves the expenditure of large budgets and therefore, designers and decision makers should have the instruments to make the most suitable choice of pavement solution for each particular situation, in order to optimize the investments in road construction and maintenance. The issues involved in life-cycle cost analysis of different paving solutions will vary from region...
Highly photostable luminescent poly(caprolactone)siloxane biohybrids doped with...
Fernandes, M.; Zea Bermudez, V. de; Ferreira, R. A. Sá; Carlos, Luís; Charas, A.; Morgado, J.; Silva, Maria Manuela; Smith, Michael JohnIn this paper, we propose for the first time that the combination of a sol-gel derived diurethane cross-linked siloxane-based biohybrid host including short poly(ε-caprolactone) segments (PCL(530)) and lanthanide aquocomplexes incorporating β-diketonate ligands yields an effective protecting cage that efficiently encapsulates the emitting centers and reduces luminescence quenching. The results obtained using th...
Triplet-State and Singlet Oxygen Formation in Fluorene-Based Alternating Copoly...
Fonseca, S. M.; Pina, J.; Arnaut, L. G.; Melo, J. Seixas de; Burrows, H. D.; Chattopadhyay, N.; Alcácer, L.; Charas, A.; Morgado, J.Data are reported on the triplet states of a series of fluorene-based A-alt-B type alternating copolymers based on pulse radiolysis-energy transfer and flash photolysis experiments. From the pulse radiolysis experiments, spectra are given for eight copolymers involving phenylene, thiophene, benzothiadiazole, and oligothienylenevinylene groups. Quantum yields for triplet-state formation (ΦT) have been obtained b...
Influence of Solvent Quality on the Self-Organization of Archetypical Hairy Rod...
Knaapila, M.; Garamus, V. M.; Dias, F. B.; Almásy, L.; Galbrecht, F.; Charas, A.; Morgado, J.; Burrows, H. D.; Scherf, U.; Monkman, A. P.We report on the nanoscale structure and solvent-induced phase behavior of two, nearly similar π-conjugated hairy-rod polymers, branched side chain poly[9,9-bis(2-ethylhexyl)fluorene-2,7-diyl] (PF2/6) and linear side chain poly[9,9-dioctylfluorene-2,7-diyl] (PFO or PF8), in good and bad (or poor) solventsdeuterated toluene and deuterated methylcyclohexane (MCH)at 20 °C. Small-angle neutron scattering (SANS) mea...
Welding robots
Silva, Joaquim Norberto Cardoso Pires da; Loureiro, Altino; Godinho, T.; Ferreira, P.; Fernando, B.; Morgado, J.Using robots in industrial welding operations is common but far from being a streamlined technological process. The problems are with the robots, still in their early design stages and difficult to use and program by regular operators; the welding process, which is complex and not really well known and the human-machine interfaces, which are unnatural and not really working. In this article, these problems are ...