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Chitosan Salts as Stabilizing Agents for the synthesis of Silver Nanoparticles ...
Carreiro, Elisabete P.; Teixeira, António P.S.; Costa, Marina; Burke, Anthony J.; Filho, Cesar; Gonçalves, Isabel; Craveiro, Alexandre; Silva, MaraIn this work, silver nanoparticles (AgNPs) were obtained by a chemical reduction method using different chitosan salts as stabilizing agents, able to protect and prevent against the aggregation of the nanoparticles. Various chitosan salts with different organic acids, which included: acetic, succinic, formic, propionic, malic, glycolic and lactic acid were used to form the chitosan salts. The use of these organ...
New C-3 Substituted 1H- and 2H-Indazolephosphonic Acid Regioisomers: Synthesis,...
Teixeira, António P.S.; Teixeira, Fátima C.; Antunes, Inês F.; Curto, M. João M.; Duarte, M. Teresa; André, VâniaIndazole is known as an important structural motif in medicinal chemistry and, recently, has also gained attention in other areas, such as materials chemistry, with many studies showing different potential applications for their regioisomers. Phosphonates are also a class of compounds with diverse applications, ranging from medicinal to material applications. Here we present the synthesis of 1H- and 2H-indazole...
New modified Nafion-bisphosphonic acid composite membranes for enhanced proton ...
Teixeira, António P.S.; Teixeira, Fátima C.; Rangel, C. M.; Sá, Ana I. de; Ortiz, A.; Ortiz, I.; Ortiz-Martínez, V. M.Proton exchange membranes remain a crucial material and a key challenge to fuel cell science and technology. In this work, new Nafion membranes are prepared by a casting method using aryl- or azaheteroaromatic bisphosphonate compounds as dopants. The incorporation of the dopant, considered at 1 wt% loading after previous selection, produces enhanced proton conductivity properties in the new membranes, at differ...
Novas Membranas Condutoras de Protões para Células de Combustível
Teixeira, António P.S.; Teixeira, Fátima C.; Rangel, C. M.As membranas de permuta protónica continuam a ser um material fundamental e um desafio chave no desenvolvimento das células de combustível. Neste trabalho foram preparadas, usando um método de casting, novas membranas de Nafion dopadas com 1 wt% de diferentes ácidos bisfosfónicos (BPs). As novas membranas foram avaliadas relativamente à sua capacidade de absorção de água (water uptake), por gravimetria, à sua c...