Encontrados 25 documentos, a visualizar página 1 de 3
Electrospun silk-elastin-like fiber mats for tissue engineering applications
Machado, Raul; Costa, André; Sencadas, Vitor; Garcia-Arevalo, Carmen; Costa, Carlos M.; Gomes, Andreia; Lanceros-Mendez, SenentxuProtein-based polymers are present in a wide variety of organisms fulfilling structural and mechanical roles. Advances in protein engineering and recombinant DNA technology allow the design and production of recombinant protein-based polymers (rPBPs) with an absolute control of its composition. Although the application of recombinant proteins as biomaterials is still an emerging technology, the possibilities ar...
Effect of fiber alignment in gelled electrospun membranes based on poly(vinylid...
Costa, Carlos M.; Nunes-Pereira, João; Sencadas, Vitor; Silva, M. Manuela; Lanceros-Mendez, SenentxuBattery separators based on electrospun membranes of poly(vinylidene fluoride) (PVDF) have been prepared in order to study the effect of fiber alignment on the performance and characteristics of the membrane. The prepared membranes show an average fiber diameter of 272 nm and a degree of porosity of 87 %. The gel polymer electrolytes are prepared by soaking the membranes in the electrolyte solution. The alignment ...
Thermal degradation of Pb(Zr0.53Ti0.47)O3/poly(vinylidene fluoride) composites a...
Mendes, Sergio F.; Costa, Carlos M.; Sencadas, Vitor; Pereira, Mário; Wu, Aiying; Vilarinho, Paula M.; Gregorio Jr, Rinaldo; Lanceros-Mendez, SenentxuPoly(vinylidene fluoride)/Pb(Zr0.53Ti0.47)O3,([PVDF]1−x/[PZT]x) composites of volume fractions x and (0–3) type connectivity were prepared in the form of thin films. PZT powders with average grain sizes of 0.2, 0.84, and 2.35 μm in different volume fraction of PZT up to 40 % were mixed with the polymeric matrix. The influence of the inorganic particle size and its content on the thermal degradation properties o...
Audio folios management system for foreign language learning
Lousado, José; Oliveira, Isabel; Costa, Carlos M.; Roberto, Maria T.Teaching and learning using technology has, for some years, been the focus of various researchers. From vocational schools, through basic education to higher education, the use of teaching aids based on information technologies is now a common practice. Today, more than making large computing solutions to support the activities of e-learning, it is important to focus on software specific solutions whose cost of...
Nucleation of the electroactive phase of poly(vinylidene fluoride) by ferrite n...
Martins, P.; Costa, Carlos M.; Benelmekki, M.; Lanceros-Méndez, S.Multiferroics and magnetoelectric materials show interesting scientific challenges and technnologial applications in sensors, acuators and data storage. In view of the fact that only a small number of materials show this kind of properties, exhaustive research activity is being pursued towards the development of new composite materials. Multiferroic nanocomposites films composed of piezoelectric poly(vinylidene...
Degradation of the dielectric and piezoelectric response of b-poly(vinylidene f...
Silva, M. P.; Costa, Carlos M.; Sencadas, V.; Paleo, A. J.; Lanceros-Méndez, S.The effect of annealing temperature and time on the dielectric and piezoelectric response of poly(vinylidene fluoride), PVDF, has been studied. The observed decrease in the value of the dielectric, έ, and piezoelectric, d33, constants is related to depoling of the material and not to variations of the degree of crystallinity or the electroactive β-phase content. In a general way, the dielectric and piezoelectri...
Tailoring porous structure of ferroelectric poly(vinylidene fluoride-trifluoroe...
California, A.; Cardoso, V. F.; Costa, Carlos M.; Sencadas, V.; Botelho, Gabriela; Gómez Ribelles, J. L.; Lanceros-Méndez, S.Ferroelectric macroporous poly(vinylidene fluoride-trifuoroethylene) membranes have been produced by isothermal crystallization from the solution at different temperatures starting from different diluted solutions of the co-polymer in dimethylformamide. In this way pore architecture, consisting in interconnected spherical pores can be obtained. The mechanism and kinetics of solvent evaporation was investigated ...
Nucleation of the electroactive β-phase and enhancement of the optical transpar...
Lopes, A. C.; Costa, Carlos M.; Tavares, C. J.; Neves, I. C.; Lanceros-Méndez, S.Poly(vinylidene fluoride), PVDF, based nanocomposites with different clays structures have been processed by solvent casting and melt crystallisation. Depending on the melting temperature of the polymer, the nanocomposite recrystalises in the electroactive or non electroactive β-phase of the polymer. This fact is related to the thermal behaviour of the clay. For montmorillonite clay, the full crystallisation...
Self-assembled dextrin nanogel as protein carrier : controlled release and biol...
Carvalho, Vera; Castanheira, Pedro; Madureira, Pedro; Ferreira, Sílvia A.; Costa, Carlos M.; Faro, Carlos; Teixeira, João P.; Vilanova, ManuelInterleukin-10 (IL-10) is an anti-inflammatory cytokine, which active form is a non-covalent homodimer. Given the potential of IL-10 for application in various medical conditions, it is essential to develop systems for its effective delivery. In previous work, it has been shown that a dextrin nanogel effectively incorporated and stabilized rIL10, enabling its release over time. In this work, the delivery system...
Towards an EHR architecture for mobile citizens
Pedrosa, Tiago; Lopes, Rui Pedro; Santos, João C.; Costa, Carlos M.; Oliveira, José LuísElectronic Health Records are typically created and stored in different places, by different healthcare providers, using different formats and technology. This poses an obstacle to patient mobility and contributes to scatter personal health related information. Patients constantly move between healthcare providers, searching for a better service, lower prices or specialists. It is important that healthcare p...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||