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15 results on '"Vargas-Gutiérrez, Gregorio"'

3. Nanostructured Copper Selenide Coatings for Antifouling Applications

Author

Mancillas-Salas, Sergio, primary, Ledón-Smith, José Ángel, additional, Pérez-Álvarez, Marissa, additional, Cadenas-Pliego, Gregorio, additional, Mata-Padilla, José Manuel, additional, Andrade-Guel, Marlene, additional, Esparza-González, Sandra Cecilia, additional, Vargas-Gutiérrez, Gregorio, additional, Sierra-Gómez, Uriel Alejandro, additional, and Saucedo-Salazar, Esmeralda Monserrat, additional

Published
2024
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10. Optimization Study for Desorption of Arsenic and Regeneration Performance on Magnetic Carbon Xerogels for Environmental Sustainability †.

Author

Khamkure, Sasirot, Bustos-Terrones, Victoria, Torrecilla-Valle, Arael, Gamero-Melo, Prócoro, Reyes-Rosas, Audberto, Vargas-Gutiérrez, Gregorio, and Garrido-Hoyos, Sofía-Esperanza

Subjects
SUSTAINABILITY, XEROGELS, DESORPTION, POLYCONDENSATION, SOL-gel processes, SCANNING electron microscopy
Abstract

Magnetic carbon xerogels were synthesized via direct sonication to load magnetite nanoparticles in sol–gel polycondensation onto resorcinol-formaldehyde gels. The resulting organic gels were carbonized and subjected to surface modification using H2O2 and characterized using scanning electron microscopy and energy-dispersive X-ray spectroscopy. The desorption capacity was optimized using response surface methodology, with the adsorbent dose identified as the most significant quantitative factor. The kinetic adsorption was well described using the Elovich and Power equations. The regeneration capacity was evaluated over four sequential adsorption–desorption cycles, demonstrating the possibility of reusing the adsorbent and reducing the environmental impact. [ABSTRACT FROM AUTHOR]

Published
2023
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13. Microstructural Characterization and Wear Properties of Fe-Based Amorphous-Crystalline Coating Deposited by Twin Wire Arc Spraying

Author

Arizmendi Morquecho, Ana, Campa Castilla, Araceli, Leyva Porras, César, Aguilar Martínez, Josué Amilcar, Vargas Gutiérrez, Gregorio, Moreno Bello, Karla Judith, López López, L., Arizmendi Morquecho, Ana, Campa Castilla, Araceli, Leyva Porras, César, Aguilar Martínez, Josué Amilcar, Vargas Gutiérrez, Gregorio, Moreno Bello, Karla Judith, and López López, L.

Abstract

Twin wire arc spraying (TWAS) was used to produce an amorphous crystalline Fe-based coating on AISI 1018 steel substrate using a commercial powder (140MXC) in order to improve microhardness and wear properties. The microstructures of coating were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) as well as the powder precursor. Analysis in the coating showed the formation of an amorphous matrix with boron and tungsten carbides randomly dispersed. At high amplifications were identified boron carbides at interface boron carbide/amorphous matrix by TEM. This kind of carbides growth can be attributed to partial crystallization by heterogeneous nucleation. These interfaces have not been reported in the literature by thermal spraying process. The measurements of average microhardness on amorphous matrix and boron carbides were 9.1 and 23.85 GPa, respectively. By contrast, the microhardness values of unmelted boron carbide in the amorphous phase were higher than in the substrate, approaching 2.14 GPa. The relative wear resistance of coating was 5.6 times that of substrate. These results indicate that the twin wire arc spraying is a promising technique to prepare amorphous crystalline coatings.

Published
2014

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