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Petrogenetic links between lepidolite-subtype aplite-pegmatite, aplite veins an...
Antunes, Isabel Margarida Horta Ribeiro; Neiva, Ana Margarida R.; Ramos, João Farinha; Silva, Paulo Bravo; Silva, Maria Manuela Vinha GuerreiroIn the Segura area, Variscan S-type granites, aplite veins and lepidolite-subtype granitic aplite-pegmatite veins intruded the Cambrian schist-metagraywacke complex. The granites are syn D3. Aplite veins also intruded the granites. Two-mica granite and muscovite granite have similar ages of 311.0 ± 0.5 Ma and 312.9 ± 2.0 Ma but are not genetically related, as indicated by their geochemical characteristics and (...
Electrochemical applications of electrolytes based on ionic liquids
Neto, M. J.; Leones, R.; Sentanin, F.; Esperança, J.; Medeiros, Maria José; Pawlicka, A.; Silva, Maria ManuelaThe potential utility of room temperature ionic liquids as electrolytes in current electrochemical applications has been explored. Hence, the electrochemical behavior of [Ni(tmc)]Br2 complex at a glassy carbon electrode in the absence or in the presence of unsaturated halides in the ionic liquids, 1-ethyl-3- methylimidazolium ethylsulfate, [C2mim][C2SO4] and N,N,Ntrimethyl- N-(2-hydroxyethyl) ammonium bis(trifl...
Vibrational analysis of d-PCL(530)/siloxane based hybrids doped with two lithiu...
Ferreira, C. B.; Fernandes, M.; Rodrigues, L. C.; Silva, Maria Manuela; Smith, Michael John; Bermudez, V. de ZeaPublished online: 22 May 2013 ; The present study has been focused on environmentally friendly sol-gel derived electrolytes based on a di-urethane cross-linked d-PCL(530)/siloxane network (where d represents di, PCL identifies the poly(ε–caprolactone) biopolymer and 530 is the average molecular weight in g.mol-1) doped with a wide range of concentration of lithium perchlorate (LiClO4) and lithium bis(trifluoro...
Poly(ε-caprolactone)/siloxane biohybrids with applications in "smart windows"
Rodrigues, L. C.; Silva, Maria Manuela; Smith, Michael John; Gonçalves, A.; Fortunato, E.In view of the potential technological impact of solid polymer electrolytes (SPEs) in the domain of solid-state electrochemistry, particularly in the production of advanced batteries, sensors and electrochromic and photoelectrochemical devices, the sub-class of SPE materials has attracted considerable interest during the last two decades. Li+-doped ormolyte systems obtained using the sol-gel method has been inv...
Synthesis and electrochemical characterization of aPEO-based polymer electrolyte
Rodrigues, Luísa; Silva, Maria Manuela; Veiga, H.; Esperança, J.; Costa, M.; Smith, Michael JohnIn this paper the preparation and purification of an amorphous polymer network, poly[oxymethylene-oligo(oxyethylene)], designated as aPEO, are described. The flexible CH2CH2O segments in this host polymer combine appropriate mechanical properties, over a critical temperature range from -20 to 60 ºC, with labile salt-host interactions. The intensity of these interactions is sufficient to permit solubilization of...
Synthesis and characterization of amorphous poly(ethylene oxide)/poly(trimethyl...
Rodrigues, Luísa; Silva, Maria Manuela; Smith, Michael JohnSolid Polymer Electrolytes (SPEs) have been proposed as substitutes for conventional non-aqueous electrolytes in various electrochemical devices. These promising materials may be of interest in various practical devices including batteries, sensors and electrochromic displays as they can offer high performance in terms of specific energy and specific power (batteries), safe operation, form flexibility in device...
Income and mental health
Silva, Maria Manuela Correia Vieira daRESUMO: A enorme carga e o sofrimento provocado pelas doenças mentais no mundo tornam imperioso conhecer melhor os seus determinantes. Combater as desigualdades em saúde tornou-‐se uma prioridadade de saúde pública, mas é necessário estabelecer as suas vias causais para ser possível implementar intervenções e políticas efetivas. A literatura científica tem sugerido a importância dos determinantes sociais na et...
Structural studies of novel di-ureasil ormolytes doped with lithium hexafluoroa...
Rodrigues, L. C.; Fernandes, M.; Zea Bermudez, V. de; Silva, Maria Manuela; Smith, Michael JohnHybrid electrolytes produced by the sol-gel process were obtained by doping a di-urea cross-linked POE/siloxane hybrid host framework (d-U(2000)) with lithium hexafluoroantimonate (LiSbF6). Flexible, transparent xerogel films with ∞ > n ≥ 2.5 (where n, composition, represents the molar ratio of oxyethylene units OCH2CH2 per Li+ ion), thermally stable to at least 200 ºC, were prepared. At 30 ºC the highest ionic...
Descontaminação química de resíduos líquidos orgânicos hospitalares contaminados
Silva, Maria Manuela Ferreira Brás Teixeira daTese de mestr.. Engenharia Biomédica. Faculdade de Engenharia. Universidade do Porto. 2001
K+-doped poly(gamma-caprolactone)/siloxane biohybrid electrolytes for electroch...
Fernandes, M.; Rodrigues, L. C.; Ferreira, R. A. Sá; Gonçalves, A.; Fortunato, E.; Silva, Maria Manuela; Smith, Michael John; Zea Bermudez, V. deIn Press; available online 10 November 2011 ; Sol-gel derived KCF3SO3-doped di-urethane cross-linked poly(ε-caprolactone) (PCL(530))/siloxane ormolytes with ∞ > n ≥ 0.5 (n indicates the number of (C(=O)(CH2)5O) repeat units per K+ ion) have been studied. Xerogel samples with n ≥ 1 are thermally stable up to 235 ºC. A minor proportion of PCL crystallites occur in some dilute-to-concentrated samples. At n ≤ 4 a ...
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