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Your search keyword '"Estrada Villegas, Gethzemani Mayeli"' showing total 11 results
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11 results on '"Estrada Villegas, Gethzemani Mayeli"'

2. A novel in situ AuNPs synthesis by electrospinning technique

Author

Castro, Cynthia, primary, Arizmendi-Morquecho, Ana, additional, García-Gutiérrez, Domingo, additional, ZúñigaMartínez, Jorge Alexis, additional, Lucio-Porto, Raúl, additional, Gonzalez-Perez, Giovanni, additional, and Estrada-Villegas, Gethzemani Mayeli, additional

Published
2024
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3. Exploring cellulose triacetate nanofibers as sustainable structuring agent for castor oil: formulation design and rheological insights

Author

Universidad de Sevilla. Departamento de Física Aplicada II, European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER), Universidad de Huelva, Junta de Andalucía, Martín Alfonso, Manuel Antonio, Rubio Valle, José Fernando, Estrada Villegas, Gethzemani Mayeli, Sánchez Domínguez, Margarita, Martín Alfonso, José Enrique, Universidad de Sevilla. Departamento de Física Aplicada II, European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER), Universidad de Huelva, Junta de Andalucía, Martín Alfonso, Manuel Antonio, Rubio Valle, José Fernando, Estrada Villegas, Gethzemani Mayeli, Sánchez Domínguez, Margarita, and Martín Alfonso, José Enrique

Abstract

Developing gelled environmentally friendly dispersions in oil media is a hot topic for many applications. This study aimed to investigate the production of electrospun cellulose triacetate (CTA) nanofibers and to explore their potential application as a thickening agent for castor oil. The key factors in the electrospinning process, including the intrinsic properties of CTA solutions in methylene chloride (DCM)/ethanol (EtOH), such us the shear viscosity, surface tension, and electrical conductivity, were systematically studied. The impact of the CTA fiber concentration and the ratio of DCM/EtOH on the rheological properties of the gel-like dispersions in castor oil was then investigated. It was found that dispersions with a non-Newtonian response and above a critical concentration (5 wt.%), corresponding to approximately 2–2.5 times the entanglement concentration, are required to produce defect-free nanofibers. The average fiber diameter increased with CTA concentration. Further, the morphology and texture of the electrospun nanofibers are influenced by the ratio of solvents used. The rheological properties of dispersions are strongly influenced by the concentration and surface properties of nanofibers, such as their smooth or porous textures, which allow their modulation. Compared to other commonly used thickeners, such as synthetic polymers and metal soaps, CTA electrospun nanofibers have a much higher oil structuring capacity. This work illustrated the potential of using CTA nanofibers as the foundation for fabricating gel-like dispersions in oil media, and thus exerting hierarchical control of rheological properties through the use of a nanoscale fabrication technique.

Published
2024

6. Core/shell fibers of Carboxymethylcellulose/ Poly(lactic acid) loaded with Curcumin

Author

León-Pérez, Jadileyg Gabriela, Estrada-Villegas, Gethzemani Mayeli, Morales-Corona, Juan, Olayo, Roberto, and Olayo-Valles, Roberto

Subjects
Carboxymethylcellulose, Electrohilado Coaxial, Curcumin, Curcumina, Poly (lactic acid), Coaxial Electro-spinning, Fibras Núcleo/Coraza, Carboximetilcelulosa, Core/Shell Fibers, Poli(ácido láctico)
Abstract

Resumen Para dosificar curcumina (Cur) evitando su degradación, se diseñó un material polimérico que consta de fibras con estructura núcleo/coraza. Se utilizó la técnica de electrohilado coaxial para obtener de fibras con núcleo de ácido poliláctico (PLA) y coraza de carboximetilcelulosa (CMC). Fibras de CMC/PLA fueron comparadas con fibras convencionales de PLA cargadas con curcumina. Imágenes de microscopia electrónica de barrido permitieron caracterizar la estructura núcleo/coraza de las fibras de CMC/PLA-Cur. La presencia de Cur en las fibras fue confirmada por espectroscopia Raman. Análisis termogravimétrico y calorimetría diferencial de barrido mostraron el efecto de la incorporación de Cur en el comportamiento térmico y permitió contrastar las fibras de PLA con las de CMC/PLA. Se realizaron experimentos de liberación de Cur a pH fisiológico y los resultados se ajustaron al modelo de Korsmeyer-Peppas. La tasa de liberación de fibras de CMC/PLA es significativamente menor a la de fibras de PLA sin coraza. Abstract To dose curcumin (Cur) while avoiding its degradation, a polymeric material consisting of fibers with core/ shell structure was designed. Coaxial electrospinning allowed us to obtain fibers with poly(lactic acid) (PLA) core, and carboxymethylcellulose (CMC) shell. CMC/PLA fibers were compared with conventional PLA fibers. Scanning electron microscopy images allowed us to characterize the core/shell structure of CMC/ PLA-Cur fibers. The presence of Cur in the fibers was confirmed by Raman spectroscopy. Thermogravimetric analysis and differential scanning calorimetry showed the effect of Cur on the thermal behavior of the fibers, and showed contrasting behavior between CMC/PLA and PLA fibers. Cur release experiments were performed at physiological pH and the results were fitted with the Korsmeyer-Peppas model. The release rate of CMC/PLA fibers was significantly lower than PLA fibers.

Published
2021

7. Dialisis

Author

Salazar-Fuentes, Génesis Irais, primary, Vázquez-García, Rosa Ángeles, additional, Estrada-Villegas, Gethzemani Mayeli, additional, and Veloz-Rodríguez, María Aurora, additional

Published
2021
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