Ropio, I, Baptista AC, Nobre J, Correia J, Belo F, Taborda S, Faustino MBM, Borges JB, Kovalenko A, Ferreira I.
2018.
Cellulose paper functionalised with polypyrrole and poly(3,4-ethylenedioxythiophene) for paper battery electrodes. Organic Electronics. 62:530-535.
AbstractA simple process of commercial paper functionalisation via in situ polymerisation of conductive polymers onto cellulose fibres was investigated and applied as electrodes in paper-based batteries. The functionalisation involved polypyrrole (PPy) and Poly (3,4-ethylenedioxythiophene) (PEDOT) as conductive polymers with the process of functionalisation optimised for each polymer individually with respect to oxidant-to-monomer ratios and polymerisation times and temperature. Paper with conductivity values of 44 mS/cm was obtained by exposing the samples to pyrrole vapour for a period of 30 min at room temperature; however, polymerisation at temperatures of 40 °C lead to higher conductivity values to up 141 mS/cm. Consequently, functionalised PPy and PEDOT papers were applied as cathodes in batteries with Al foil anodes and commercial paper soaked in an electrolyte solution of NaCl.
Baptista, AC, Ropio I, Romba B, Nobre J, Henriques C, Silva JC, Martins JI, Borges JP, Ferreira I.
2018.
Cellulose-based electrospun fibers functionalized with polypyrrole and polyaniline for fully organic batteries. Journal of Materials Chemistry A. 6(1):256-265.
AbstractA novel cellulose-based bio-battery made of electrospun fibers activated by biological fluids has been developed. This work reports a new concept for a fully organic bio-battery that takes advantage of the high surface to volume ratio achieved by an electrospun matrix composed of sub-micrometric fibers that acts simultaneously as the separator and the support of the electrodes. Polymer composites of polypyrrole (PPy) and polyaniline (PANI) with cellulose acetate (CA) electrospun matrix were produced by in situ chemical oxidation of pyrrole and aniline on the CA fibers. The structure (CA/PPy|CA|CA/PANI) generated a power density of 1.7 mW g−1 in the presence of simulated biological fluids, which is a new and significant contribution to the domain of medical batteries and fully organic devices for biomedical applications.
Baptista, AC, Ropio I, Romba B, Nobre JP, Henriques C, Silva JC, Martins JI, Borges JP, Ferreira I.
2018.
Cellulose-based electrospun fibers functionalized with polypyrrole and polyaniline for fully organic batteries. J Mater Chem A. 6(1):256-265.
AbstractA novel cellulose-based bio-battery made of electrospun fibers activated by biological fluids has been developed. This work reports a new concept for a fully organic bio-battery that takes advantage of the high surface to volume ratio achieved by an electrospun matrix composed of sub-micrometric fibers that acts simultaneously as the separator and the support of the electrodes. Polymer composites of polypyrrole (PPy) and polyaniline (PANI) with cellulose acetate (CA) electrospun matrix were produced by in situ chemical oxidation of pyrrole and aniline on the CA fibers. The structure (CA/PPy|CA|CA/PANI) generated a power density of 1.7 mW g−1 in the presence of simulated biological fluids, which is a new and significant contribution to the domain of medical batteries and fully organic devices for biomedical applications.
Giannakidis, G, Gargiulo M, De Miglio R, Chiodi A, Seixas J, Simoes SG, Dias L, Gouveia J.
2018.
Challenges faced when addressing the role of cities towards a below 2-degree world. Limiting Global Warming to Well Below 2°C: Energy System Modelling and Policy Development. (
Giannakidis G., K. Karlsson, M. Labriet, B. Ó Gallachóir, Eds.).: Lecture Notes in Energy 64. Springer International publishing. Doi: 10.1007/978-3-319-74424-7
Pádua, AC, Palma S, Gruber J, Gamboa H, Roque ACA.
2018.
Design and Evolution of an Opto-electronic Device for VOCs Detection. Proceedings of the 11th International Joint Conference on Biomedical Engineering Systems and Technologies. :48-55.
AbstractElectronic noses (E-noses) are devices capable of detecting and identifying Volatile Organic Compounds (VOCs) in a simple and fast method. In this work, we present the development process of an opto-electronic device based on sensing films that have unique stimuli-responsive properties, altering their optical and electrical properties, when interacting with VOCs. This interaction results in optical and electrical signals that can be collected, and further processed and analysed. Two versions of the device were designed and assembled. E-nose V1 is an optical device, and E-nose V2 is a hybrid opto-electronic device. Both E-noses architectures include a delivery system, a detection chamber, and a transduction system. After the validation of the E-nose V1 prototype, the E-nose V2 was implemented, resulting in an easy-to-handle, miniaturized and stable device. Results from E-nose V2 indicated optical signals reproducibility, and the possibility of coupling the electrical signals to the opt ical response for VOCs sensing.
Mirante, F, Dias L, Silva M, Ribeiro SO, Corvo MC, de Castro B, Granadeiro CM, Balula SS.
2018.
Efficient heterogeneous polyoxometalate-hybrid catalysts for the oxidative desulfurization of fuels. Catalysis Communications. 104:1–8.: Elsevier
AbstractThe heterogenization of the highly active monovacant polyoxotungstate ([PW11O39]7 −, abbreviated as PW11) was achieved by preparing the corresponding long chain quaternary ammonium salt (ODA7PW11, ODA = CH3(CH2)17(CH3)3N). The complete cation exchange confers total heterogeneity to the monovacant catalyst while keeping its oxidative catalytic activity. In fact, the heterogeneous catalyst allowed for the complete desulfurization of a multicomponent model diesel (2000 ppm S) after 40 min of reaction, conciliating extraction (using BMIMPF6 solvent) and oxidation (ECODS process using H2O2 oxidant). The heterogeneous catalyst has shown a superior desulfurization performance when compared with the homogeneous quaternary ammonium TBAPW11 catalyst (TBA = (C4H9)4 N). Both hybrid catalysts have been successfully reused in consecutive ECODS cycles. Additionally, the long carbon chain cations provide a protective environment around the polyoxometalate allowing for ODA7PW11 to retain its heterogeneity and structure after the ECODS process.
Matos, R, Chaparro C, Silva JC, Valente M, Borges JP, Soares PIP.
2018.
Electrospun composite cellulose acetate/iron oxide nanoparticles non-woven membranes for magnetic hyperthermia applications. Carbohydrate polymers. 198:9-16.
AbstractIn the present work composite membranes were produced by combining magnetic nanoparticles (NPs) with cellulose acetate (CA) membranes for magnetic hyperthermia applications. The non-woven CA membranes were produced by electrospinning technique, and magnetic NPs were incorporated by adsorption at fibers surface or by addition to the electrospinning solution. Therefore, different designs of composite membranes were obtained. Superparamagnetic NPs synthesized by chemical precipitation were stabilized either with oleic acid (OA) or dimercaptosuccinic acid (DMSA) to obtain stable suspensions at physiological pH. The incorporation of magnetic NP into CA matrix was confirmed by scanning and transmission electron microscopy. The results showed that adsorption of magnetic NPs at fibers’ surface originates composite membranes with higher heating ability than those produced by incorporation of magnetic NPs inside the fibers. However, adsorption of magnetic NPs at fibers’ surface can cause cytotoxicity depending on the NPs concentration. Tensile tests demonstrated a reinforcement effect caused by the incorporation of magnetic NPs in the non-woven membrane.
Fernandes, CSM, Teixeira GDG, Iranzo O, Roque ACA.
2018.
Engineered protein variants for bioconjugation. Biomedical Applications of Functionalized Nanomaterials - Concepts, Development and Clinical Translation. (
Sarmento, Bruno, Jose Das Neves, Eds.).: Elsevier
Reckien, D, Heidrich O, Church J, Pietrapertos F, De Gregorio-Hurtado S, D'Alonzo V, Foley A, Simoes SG, Lorencová EK, Orruk H, Orrum K, Wejs A, Flacke J, Olazabal M, Geneletti D, Feliu E, Vasilier S, Nador C, Krook-Riekkola A, Matosović M, A. Fokaides P, I. Ioannou B, Flamos A, Spyridaki N.
2018.
How are cities planning to respond to climate change? Assessment of local climate plans from 885 cities in the EU-28 Journal of Cleaner Production. doi: 10.1016/j.jclepro.2018.03.220. 191:207-219.
Cidade, MT, Ramos DJ, Santos J, Calero N, Muñoz J, Borges JP.
2018.
Injectable hydrogels based on pluronic/water systems filled with alginate microparticles: Rheological characterization. Publisher Logo Conference Proceedings. 1981:020091.
AbstractIn this paper the rheological characterization of Pluronic/water systems filled with alginate microparticles is presented. The rheological characterization of the Pluronic/water systems allowed for the choice of the best Pluronic concentration taking into account its applications as injectable hydrogels for tissue repair. The effect on the rheological behavior of the addition of alginate microparticles, to be loaded with the drug, was analyzed and the maximum concentration of microparticles determined.