Browsing by Author "Armijo, F."
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- ItemA new methodology to evaluate adsorption capacity on nanomaterials(2015) Antilen, Mónica; Amiama, F.; Otaiza, M.; Armijo, F.; Escudey, M.; Pizarro, C.; Arancibia Miranda, N.
- ItemA novel one-pot method to synthesize hierarchical mesoporous carbon foams with ZnO coating(2019) Covaciu, Manuela; Ramos Moore, Esteban; Rojas, S.; Lastra, N.; Armijo, F.; Walczak, M.
- ItemBiofilm development and biocorrosion of stainless steel AISI 316L exposed to marine conditions(2015) Paille, L.; Irre, J.A.; Fischer, P.; Galarce, C.; Walczak, M.; Armijo, F.; Pizarro, G.; De La Iglesia, R.; Vargas Cucurella, Ignacio Tomas
- ItemChemical metallation of poly-p-tetraaminophenylporphyrin films grown by cyclic voltammetry on conducting glass electrodes.(2004) Ramírez Jofré, Galo; Cornejo, G.; Lucero, M.; Riquelme, A.; Azocar, I.; Armijo, F.; Aguirre, M.J.; Trollund, E.
- ItemCorrosion behavior of stainless steel AISI 470 in pacific seawater(2015) Aguirre, J.; Walczak, M.; Armijo, F.; Daille, L.; Fischer, D.; Galarce, C.; De La Iglesia, R.; Pizarro, G.; Vargas Cucurella, Ignacio Tomas
- ItemDecreasing Hg(II) toxicity on cytosolic GSH-S transferases from rat liver using a pedot modified electrode(2013) Arteaga, G.C.; Antilen Lizana, Monica Paulina; Faúndez, M.; Díaz, F.R.; Armijo, F.; Hernández, L.A.; Ramos, A.; del Valle, M.A.
- ItemDevelopment of an electrochemical impedimetric immunosensor for Corticotropin Releasing Hormone (CRH) using half-antibody fragments as elements of biorecognition(2019) Durán Lagos, Boris Guido; Castaneda, E.; Armijo, F.
- ItemEffect Of Ultrasound Irradiation in Nucleation and Growth Mechanisms of Poly-o-Anisidine and Polyaniline(2013) del Valle, M. A.; Romero, M.; Diaz, F. R.; Armijo, F.; del Rio, R.; Nunez, I.; Dalchiele, E. A.The current work studies the effect of ultrasound on nucleation and growth mechanisms (NGM) from the respective i-t transients obtained during the electro-polymerization of ortho-anisidine (OAN) and aniline (ANI), using a potentiostatic (potential step) approach. To this end, optimum electro-synthesis working conditions were searched for using cyclic voltammetry in the presence and absence of ultrasound radiation. The results revealed that ultrasonic disturbance has no effect on the oxidation potential of the starting units. In addition, i-t transients recorded at controlled potential are complex and their deconvolution revealed that both monomers studied herein consist of three contributions. However, it is noteworthy that when the system was irradiated with ultrasound, the respective NGM was not modified, since the same contributions are retained, only the time at which they are defined and the proportion with which each of them contributes to the total charge are altered. It was verified that the contribution most affected by ultrasound was that with diffusion-controlled growth, which is consistent with the morphology changes of the obtained polymeric deposits and the respective increase in the recorded currents during its electro-synthesis; this was explained by means of the proposed model of electro-polymerization based on oligomers solubility at the electrode/solution interface.
- ItemInfluence of the exciton blocking layer on the stability of layered organic solar cells(2011) Lare, Y.; Kouskoussa, B.; Benchouk, K.; Ouro Djobo, S.; Cattin, L.; Morsli, M.; Díaz Alzamora, Fernando Raúl; Gacitúa Santelices, Manuel Alejandro; Abachi, T.; Valle de la Cortina, María Angélica del; Armijo, F.; East, Gaston A.; Bernede, J. C.
- ItemInfluence of the Supporting Electrolyte on the Electrochemical Polymerization of 3,4-Ethylenedioxythiophene. Effect on p- and n-Doping/Undoping, Conductivity and Morphology(2016) Valle Delaware la Cortina, María Angélica del; Ramírez Ramírez, Andrés Mauricio; Hernández Díaz, Loreto Andrea; Armijo, F.; Diaz, F.; Arteaga Arroyo, Gean Carlos
- ItemPoly(3,4-ethylenedioxythiophene) used as a coating on stainless steel AISI 470. Evaluation of corrosion inhibition performance(2015) Aguirre, J.; Armijo, F.; Walczak, M.; De La Iglesia, R.; Pizarro, G.; Vargas Cucurella, Ignacio Tomas
- ItemSelective electrochemical determination of dopamine, using a poly(3,4-ethylenedioxythiophene)/polydopamine hybrid film modified electrode(2013) Salgado, R.; del Rio, R.; del Valle, M. A.; Armijo, F.The selective determination of dopamine (DA) was performed in the presence of ascorbic (AA) and uric acid (UA), using a platinum electrode (Pt) modified with a hybrid film of poly(3,4-ethylenedioxythiophene)/polydopamine (PEDOT/PDA). PEDOT was obtained using a potential step technique on a bare Pt electrode. PDA was subsequently obtained on the PEDOT coated electrode by cyclic voltammetry. The PDA thickness effect allows observing just the DA oxidation signal in the presence of some interferents, e.g. uric acid (UA) and ascorbic acid (AA). The formed PEDOT/PDA hybrid film was compared with PEDOT in a K-4[Fe(CN)(6)] solution in PBS of pH 7.4. Inhibition of the [Fe (CN)(6)](4-)/[Fe(CN)(6])(3-) redox couple on the PEDOT/PDA surface was observed, indicating the film bears a negative surface charge. The different electrodes were characterized by SEM and FTIR. DA amperometric determination was performed in the presence of AA and UA. The sensor proved to be selective toward DA. Calibration curves, with a linear range 1.5 x 10(-6) to 50 x 10(-6) mol L-1, enabled the limit of detection and quantification to be determined, namely 0.65 x 10(-6) mol L-1 and 1.77 x 10(-6) mol L-1, respectively. The described methodology permits, therefore, to propose this modified electrode as a new electrode for DA determination in the presence of interferents. (C) 2013 Elsevier B.V. All rights reserved.
- ItemUse of fluorine-doped tin oxide electrodes for lipoic acid determination in dietary supplements(2012) Miranda, M. P.; del Rio, R.; del Valle, M. A.; Faundez, M.; Armijo, F.This paper reports a novel application of fluorine-doped tin oxide electrodes (FTO). To this purpose, electrochemical oxidation mechanism of lipoic acid (LA) at different pHs in the presence of interferents was investigated. FTO displayed electroactivity toward LA oxidation at pH 2. The results indicated that interference from water soluble interferents, derived from excipients or other components coming from dietary supplements, is completely removed with the use of FTO. Square-wave voltammetry, SWV, studies have been shown that at pH 2 an anodic peak at about 0.95 V vs. Ag/AgCl, KCl(sat'd) appears. It was also demonstrated that LA oxidation is diffusion-controlled, involving two electrons in the overall process. From these results, a FTO-based electrode was proposed as LA sensor. SWV was the technique of choice for LA quantitation. A linear range between 5 and 500 mu mol L-1 was found. These results allowed postulating FTO as a potential candidate for the electrochemical determination of LA in the presence of interferents contained in pharmaceutical samples of supplementary diet. (C) 2012 Elsevier B.V. All rights reserved.