Browsing by Author "Morales Morales, Jimmy Alexander"
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Item Calificación de un dispositivo de inmersión para así realizar recubrimientos de TiO2/Hidroxiapatita sobre superficies metálicas(Universidad Santiago de Cali, 2019) Martínez Bellaiza, Daniela; Morales Morales, Jimmy Alexander; Castillo Ayala, Jorge EnriqueEl método de inmersión o “Dip-Coating” es utilizado para la obtención de películas delgadas sobre diferentes superficies y con un amplio rango de aplicación; este consiste en la inmersión y posterior extracción de un sustrato dentro de una solución precursora para la formación de la película. En este trabajo se realizó la calificación de un dispositivo de inmersión de bajo costo elaborado en la Universidad Santiago de Cali y se ejecutaron recubrimientos sobre sustratos de acero inoxidable con TiO2/Hidroxiapatita por la técnica de química húmeda. Para la calificación se evaluaron parámetros de velocidad y tiempo de inmersión, abordando la calificación de instalación, desempeño y diseño (IQ, PQ y QD respectivamente); la síntesis de Hidroxiapatita se realizó por precipitación controlada y se analizaron las muestras secas por IR/ATR y TGA-DSC obteniendo unos picos característicos del compuesto y un buen comportamiento térmico, además se analizaron los revestimientos realizados utilizando técnicas espectroscópicas obteniendo los depósitos esperados en los sustratos y obteniendo una relación de Ca/P de 1,57.Item Electro-oxidación del 2-aminotiazol en agua: un estudio preliminar(Informador Técnico, 2017) Villamarin, Andres Felipe; Morales Morales, Jimmy AlexanderEn este trabajo se realizó el estudio de la oxidación electroquímica del 2-aminotiazol (2AT) en medio acuoso (H2O), se utilizó la técnica de ciclovoltamperometria mediante un sistema de tres electrodos, alambre de platino como electrodo de trabajo (d = 0,5 mm), una malla de platino como contra electrodo y un alambre de plata como seudo referencia. Se observó que el proceso de electro-oxidación (onda Ia) empezó en 0,5V y un pico anódico se presentó alrededor de 0,75V, a diferentes velocidades de barrido de potencial (v = 0,05 - 0,1 Vs-1) la intensidad de la corriente aumento. Una voltamperometria a 25 ciclos, evidenció la disminución en la intensidad de la señal de oxidación característica del grupo amino primario, probablemente debido a la acumulación de estructuras químicas poco reducidas sobre la superficie del electrodo.Item Electrochemical reduction processes on glassy carbon electrode of 2- Amino-4-phenylthiazoles(Journal of Physics: Conference Series, 2018) Morales Morales, Jimmy Alexander; Salazar-Osorio, M.; Florez López, E.In this work the electrochemical reduction of the compounds 2-Amino-4-(4-R-phenyl)thiazoles (1a, R = -H and 1b, R = -NHCOCH3) was performed by cyclic voltammetry in dimethylsulfoxide (DMSO) + 0,1 M tetraethylammonium tetrafluoroborate (TEABF4) and tetrabutylammonium hexafluorophosphate (TBAPF6). Two reduction signal were observed, the Ic wave (EpIc = -2.52 V) and wave IIc (EpIIc = -2.77 V) due to an electron transfer of the electrogenerated product in the Ic wave. The change of substituent influences the electrochemical behaviour, showing that an electrodonating substituent causes a higher energy requirement for the reduction of 1b, which became evident in the more negative potential, with respect to 1a. Additionally, it was observed that the peak potential in the first reduction signal Ic wave shifted to more negative values as the potential sweep rate was higher and this was indicative of an irreversible behaviour. A larger salt such as TBAPF6 causes a decrease in the intensity of peak reduction currents, contrary to what was shown by a smaller salt such as TEABF4. Also for both compounds, the cathodic peak potential of wave Ic and IIc is influenced by the effect of the size of salt used. A smaller salt favoured the electrochemical reduction of both heterocyclic compounds.Item Electroquímica, un enfoque verde para la sociedad del S.XXI(Editorial USC, 2019) Morales Morales, Jimmy Alexander; Amatore, Christian; Feliu, Juan Miguel; González Martínez, Ignacio; Rivera Iturbe, Fernando Felipe; García Ochoa, Esteban Miguel; Torresi, Roberto Manuel; Córdoba Torresi, Susana Inés; Orozco Holguín, Jahir; Torres Palma, Ricardo A.; Loaiza, Oscar Andrés; Calderón, Jorge A.; Meléndez, Ángel M.; Dector, Andrés; Quesada-Plata, Fabián E.; Pimi, Luca; Palma Goyes, Ricardo Enrique; Stiefvater, Robert; Casadiego Leal, Natalia Isabel; de Oliveira Junior, Renato Prado; Salazar Duque, Carlos Alberto;Item “Enfoque verde para la inhibición de la corrosión por extracto de pimienta en nacl 3.5% p/v”.(Universidad Santiago de Cali, 2020) Ospina Lozano, Saray; Morales Morales, Jimmy Alexander; Castillo Ayala, Jorge EnriqueThis study presents a corrosion inhibition analysis of pepper oil (Piper nigrum) on carbon steel in 3.5% NaCl solution. Corrosion inhibition efficiency was studied using electrochemical impedance spectroscopy and polarization curves. The results from the polarization curves show that the efficiency of the inhibitor was 95% with a concentration of 200ppm at 27ºC the reductions in the corrosion current being about one order significant. of magnitude. The results of the EIS and analysis of chemical reactivity descriptors, showed that the unsaturation present in the molecular structure of the components of the black pepper extract, or some synergistic effects between different molecules, contributed to its efficiency as an inhibitor, adsorbing on the surface of the metal and blocking the corrosion process.Item A preliminary study of cyclic voltammetry in glassy carbon electrode. Redox Behaviour of 2-Amino-4-phenylthiazoles(Journal of Physics: Conference Series, 2018) Morales Morales, Jimmy Alexander; Rios-Acevedo, J. J.; Flórez-López, EdwinIn this work a voltammetric study of the reduction processes of five substituted 2-Amino-4-(4-X-phenyl) thiazoles (-X = -H, -OCH3, -CH3, -Cl, -NO2) in dimethylsulphoxido was performed. In the potential range considered (-2.0 to -2.9 V vs Ag+/AgCl), one signal (Ic) were detected, which was associated with the electrochemical reduction of the corresponding of the heterocycle compound. The voltammetric analysis at the reduction signal showed that when in-creasing the sweep speed (0.1 < v < 1.0 Vs⁻¹), an oxidation signal associated with the Ic wave was not observed. The linear dependence of the peak current with respect to the root of the velocity of the Ic wave, showed that this was a process controlled by diffusion and showed an apparently irreversible behavior. Peak potential shifted to more negative values as the potential sweep speed was higher; this was indicative of irreversible behavior in this signal. The substitution changes influenced the electrochemical behavior, evidencing that a substituent, as in this case methoxy group compound -OCH3, causes a greater energetic demand for the reduction of the thiazole derivative it becomes evident in the most negative potential, with respect to the derivative without substituent -H. This was new evidence of the behavior electrochemical of 2-Amino-4-(4-X-phenyl) thiazoles derivates which had not been reported for these compounds.Item Study of the electrochemical oxidation of 2-Thiazolamine and 2- Oxazolamine on a platinum wire as working electrode(Journal of Physics: Conference Series, 2018) Morales Morales, Jimmy Alexander; Villamarin, A. F.; Flórez-López, Edwin; Rios-Acevedo, J. J.The electrochemical oxidation of 2-aminothiazole (2AT) and 2-aminooxazole (2AO) was studied by means of the cyclic voltammetry technique (VC), on a Pt wire as working electrode. An anodic wide peak centred at 0.79V was observed and 0.98V (Ia wave) caused by the oxidation of the 2AT and 2AO compounds and the formation of cationic radicals on the clean surface of the electrode, respectively. During the studies of (VC) in a small range of exploration speeds, the oxidation signal increased with the increase in speed and moved to more positive potential values. This dependence of the potential with respect to the potential sweep speed indicated a controlled diffusion of the system of an irreversible nature. At T = 298K, from the electrochemical oxidation of 2 AT, a thin coating film with a light brown color was obtained on the surface of the Pt wire. However, in the electroxidation of 2 AO, that result was not evident. While the 2AT electroxidation product loses conductivity, in the case of the 2AO compound, the electrogenerated product on the surface of the platinum wire maintains the conductive properties.