Browsing by Author "Morales Morales, Jimmy Alexander (Director)"
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Item Coprecipitación de hidrotalcitas y aplicación de sus óxidos en la síntesis de bases de Schiff derivadas de 2-aminotiazol y aldehídos aromáticos(Universidad Santiago de Cali, 2021) Granja Banguera, Claudia Patricia; Morales Morales, Jimmy Alexander (Director); Mora Vargas, Jorge Andrés (Codirector)Recently, the development of new methodologies for the synthesis of products with value-added has increased, especially, the obtaining of compounds that present in their structure sulfur and nitrogen atoms mainly in heterocyclic rings, and that also contain other types of functional groups. For example, imine group (-C=N-), because they are of great importance for their applications as anticancer, antibacterial, antifungal, antiinflammatory agents, among others. Herein, we the synthesis of 1-phenyl-N-(thiazol-2-yl)methanimine (Schiff's base, SB) derived from 2-aminothiazole and benzaldehyde using mixed metal oxides (MMOs) derived from hydrotalcites (LDHs) modified with Ni2+ and Cu2+. The LDHs were synthesized by coprecipitation method, and their subsequent thermal treatment provided the corresponding MMOs. MMOs were investigated for imines synthesis in solvent free and microwave-assisted conditions. The physicochemical characterization of the LDHs demonstrated the insertion of Ni2+ and Cu2+ ions in the lamellar structure and no secondary phase formation was observed. XRD of the MMOs obtained showed the decrease in the crystallinity of the precursor and the formation of three characteristic peaks of this type of oxides, proving they are obtaining. SB was obtained with 51.3% yield when the MMO modified with 15% Cu2+ as catalyst and 1.0 equivalent of each of the starting reagents was used in 10 min of reaction at 300 W and 125 ° C.Item Empleo de melaza industrial en la síntesis de óxidos metálicos mixtos con potencial aplicación industrial(Universidad Santiago de Cali, 2023) Castellanos Bernal, Cindy Vanessa; Morales Morales, Jimmy Alexander (Director)In this work, lanthanum ferrite was prepared by mixing solutions of LaNO3•6H2O and Fe(NO3)3•9H2O with molasse and stirring continuously using a standard stirrer until a porous solid was obtained. It was macerated with agate mortar after being calcined in a muffle at various temperatures between 800 and 900ºC. This substance is placed in a vial for subsequent analysis using analytical methods like thermogravimetry (TGA), infrared vibrational spectroscopy (IR), and X-ray diffractometry (XRD). LaFeO3 nanoparticles measuring 89.2 nm were produced by employing ultrasound to aid in the synthesis and a 9-hour calcination period with a molasses/lanthanum ratio of 1.125. The increase in stated ratio and the shorter calcination time led to a larger crystallite size. The produced mixed metal oxide's electroconductive activity indicated how it might be used to catalyze important reactions, like the electrogeneration of oxygen.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 (Director); Castillo Ayala, Jorge Enrique (Director)This 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 Oxidación electroquímica de 2-tiazolamina y 2-oxazolamina en electrodo modificado con ferritas ternarias mixtas de metales de transición(Universidad Santiago de Cali, 2021) Silgado Cortázar, Daniel Gerardo; Morales Morales, Jimmy Alexander (Director)