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Mixed solid device based on conducting polymer composite and polymer electrolyte
Neves,Silmara; Fonseca,Carla P.Tetraethyl orthosilicate (TEOS) derived sol-gel porous films have been utilized as template for the electrochemical polymerization of aniline. Polyaniline-silica composites were obtained and the redox behavior and charge/discharge capacities of a lithium polymeric battery using poly (dimethylsiloxane- co-ethylene oxide) as gel polymeric electrolyte, were investigated. The composite presented a high initial capa...
Characterization of self-assembled thiols monolayers on gold surface by electro...
Mendes,Renata K.; Freire,Renato S.; Fonseca,Carla P.; Neves,Silmara; Kubota,Lauro T.Thiols with different alkyl chain length and containing COOH terminal group were self-assembled on gold electrodes. The electron transfer of Fe(CN)6(3-/4-) couple to the electrode was studied at different pH by means cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Changes in solution pH resulted in the charge variation of the self-assembled monolayer (SAM) terminal group and, consequen...
Effects of Li+ transport and Li+ immobilization on Li+/Mg2+ competition in cell...
Layden, Brian T.; Abukhdeir, Abde M.; Williams, Nicole; Fonseca, Carla P.; Carroll, Laura; Castro, Margarita M. C. A.; Geraldes, Carlos F. G. C.Li+/Mg2+ competition has been implicated in the therapeutic action of Li+ treatment in bipolar illness. We hypothesized that this competition depended on cell-specific properties. To test this hypothesis, we determined the degree of Li+ transport, immobilization, and Li+/Mg2+ competition in lymphoblastomas, neuroblastomas, and erythrocytes. During a 50 mmol/L Li+-loading incubation, Li+ accumulation at 30 min (...
Quantification and Localization of Intracellular Free Mg2+ in Bovine Chromaffin...
Montezinho, Liliana P.; Fonseca, Carla P.; Geraldes, Carlos F. G. C.; Castro, M. Margarida C. A.Magnesium is an essential element for all living systems. The quantification of free intracellular Mg(2+) concentration ([Mg(2+)](i)) is of utmost importance since changes in its basal value may be an indication of different pathologies due to abnormalities of Mg(2+) metabolism. In this work we used (31)P NMR and fluorescence spectroscopy to determine the resting [Mg(2+)](i) in bovine chromaffin cells, a neuron...
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