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446 results on '"Rodríguez, E. M."'

2. Prospective use of the 3D printing technology for the microstructural engineering of Solid Oxide Fuel Cell components

Author

Hernández-Rodríguez, E. M., Acosta-Mora, P., Méndez-Ramos, J., Borges Chinea, E., Esparza Ferrera, P., Canales-Vázquez, J., Núñez, P., and Ruiz-Morales, J. C.

Subjects
3D printing, YSZ, Deposition methods, Microstructure, Sintering, Impresión 3D, Métodos de deposición, Microestructura, Sinterizado, Clay industries. Ceramics. Glass, TP785-869
Abstract

A cost-effective micro-manufacturing process to accurately build 3D microstructures for their prospective use in the fabrication of Solid Oxide Fuel Cells components has been tested. The 3D printing method, based on the stereolithography, allows solidifying layer by layer a dispersion of ceramic material in a liquid photosensitive organic monomer. A simple projector, a computer-controlled z-stage and a few PowerPoint slides may be used for the fabrication of a wide range of complex 3D microstructures in few minutes. In this work, 3D ceramic microstructures based on the yttria-stabilized zirconia (YSZ) were successfully fabricated. The microstructured ceramic components produced were stable after sintering at 1400 ºC for 4 h. Impedance measurements show that the fabrication process does not have any detrimental effect on the electrical properties of the structured material.Se ha probado un método económico de microfabricación que permite construir con precisión microestructuras 3D para su potencial uso en la producción de componentes de pilas de combustible de óxidos sólidos. El método de impresión 3D basado en la estereolitografía, permite solidificar, capa por capa, una dispersión de material cerámico en un líquido que contiene un monómero orgánico fotosensible. Un simple proyector, una plataforma vertical automatizada y unas pocas imágenes de PowerPoint pueden ser utilizados para la fabricación de un amplio rango de estructuras complejas 3D en unos pocos minutos. En este trabajo se han fabricado con éxito microestructuras 3D basadas en la zirconia dopada con itria (YSZ). El material cerámico microestructurado producido se mantuvo estable después de sinterizarse a 1400 ºC durante 4 h. Las medidas de impedancia demostraron que el proceso de fabricación no tenía ningún efecto perjudicial en las propiedades eléctricas del material estructurado.

Published
2014
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4. Physico-chemical and Nutritional Characterization of Phaseolus vulgaris L. Germplasm.

Author

Pineda, M. Ivars, Galdón, B. Rodríguez, Álvarez, N. Paiz, Morales, D. Afonso, Mesa, D. Ríos, Romero, C. Díaz, and Rodríguez-Rodríguez, E. M.

Subjects
COMMON bean, BEANS, SUSTAINABLE agriculture, GERMPLASM, FOOD safety, LEGUMES, TRACE elements, PHENOLS
Abstract

Background: Beans constitute one of the most important grain legume species from the socioeconomic point of view, playing an essential role in a sustainable agriculture and food safety and nutrition. In fact, beans contain a rich diversity in nutrients, highlighting their high protein, starch and fiber content. Canary Islands have a considerable diversity of beans, including three of the five cultivated species of Phaseolus: P. coccineus, P. lunatus and P. vulgaris, the latter being the most cultivated. Methods: Proximate composition, total phenolics, pH, acidity, minerals and trace elements were determined in 23 common bean accessions (P. vulgaris) in order to find out their nutritional potential and promote their cultivation. Result: Parameters found fell well into the ranges of the data described in the literature for beans. The consumption of beans contributes remarkedly to the daily intake of protein (although is deficient in sulfur amino-acids), fiber, phenolic compounds, minerals such as Mg and K and trace elements as Fe (although with low bioavailability), Cu and Mn. Phenolic compounds in beans increases when pH decreased and acidity increased. Protein content was positively correlated with trace elements content, except Se. Color of the seed influenced on content protein, starch, fiber, P, K, Mg, Fe, Cu and Zn, while shape only affected on starch, fiber, P and K. [ABSTRACT FROM AUTHOR]

Published
2023
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