Results 31 to 40 of about 796 (109)
Fluorescent Carbon Dots with Red Emission: A Selective Sensor for Fe(III) Ion Detection
ChemosensorsWe present a procedure for the synthesis and purification of p-phenylenediamine-based carbon dots that can be used for the recognition of Fe(III) ions. Carbon dots have an approximately spherical shape with an average size of 10 nm and are composed of a ...
Ángela Fernández-Merino +6 more
doaj +1 more source
ChemCatChem, Volume 16, Issue 21, November 11, 2024.This article highlights the synthesis of new LaMnO3 perovskites in which RuO2 has been incorporated in order to increase its behavior as an electrocatalyst for the oxygen evolution reaction (OER). Air electrodes made with this catalyst have been tested in zinc‐air batteries, demonstrating a significant improvement in energy efficiency for a long life ...
Katherine Jejen +4 more
wiley +1 more source
La historia del primer principio de la termodinámica y sus implicaciones didácticas [PDF]
Revista Eureka sobre Enseñanza y Divulgación de las Ciencias, 2007 En este trabajo se realiza una breve introducción histórica y epistemológica del nacimiento de la termodinámica como ciencia moderna.Se muestra,así mismo,como esta historia puede contribuir a mejorar la enseñanza de la termodinámica y a superar algunas ...
Furió-Gómez, C. +2 more
doaj +2 more sources
Factores termodinámicos y microestructurales para el diseño de aleaciones tixotrópicas
Revista de Metalurgia, 2005 El proceso de conformado en estado semisólido es un proceso híbrido entre la fundición y la conformación por deformación, que se basa en las propiedades tixotrópicas que presentan algunos materiales que han sido agitados durante su proceso de ...
Z. Azpilgain +4 more
doaj +1 more source
Polymers for Advanced Technologies, Volume 35, Issue 10, October 2024.ABSTRACT Hydrogel materials are continually developing in biomedical engineering and recently a lot of effort has gone into their engineered performance in physiological applications. Porosity is an important characteristic for tissue engineering scaffolds to allow enhanced biocompatibility and the pore size needed is dependent on the application and ...
Caitriona Winters +4 more
wiley +1 more source
EnergiesThe use of non-renewable energy resources is one of the main drivers of climate change. In response, the United Nations established the seventh Sustainable Development Goal, “Affordable and clean energy”, which promotes the transition toward renewable ...
Luis José Turcios +4 more
doaj +1 more source
FIGEMPA, 2019 La necesidad de gestionar los residuos sólidos orgánicos generados por los vendedores de jugo de naranja, en la ciudad de Quito, se propone un proceso para convertir las cáscaras de naranja, en materia prima para la obtención de pectina cítrica dando a ...
Teresa Alejandra Palacios-Cabrera +3 more
doaj +1 more source
Macromolecular Symposia, Volume 413, Issue 4, August 2024.Abstract A graphene–polymer composite is used in the manufacture by 3D printing of bipolar plates for fuel cells. This composite is formed by a PVDF matrix with graphene. The thermal and dynamic mechanical characterization of this composite is studied, as well as the density of printed composite.
Víctor Lorente‐López +3 more
wiley +1 more source
Thermodynamic and kinetic study of the recovery of tungsten and cobalt from tool waste
Revista Facultad de Ingeniería Universidad de Antioquia, 2018 En el presente proyecto se analiza la recuperación de wolframio y cobalto a partir de residuos de herramientas fabricadas con carburo de wolframio - cobalto (WC-Co), las cuales son muy empleadas en la industria metalmecánica.
Sebastián Sierra-Pérez +3 more
doaj +1 more source
A simple synthetic approach to BaZrS3, BaHfS3, and their solid solutions
Journal of the American Ceramic Society, Volume 107, Issue 2, Page 698-703, February 2024.Abstract A simple synthetic approach to BaZrS3, BaHfS3, and their solid solutions is presented and discussed here. The synthesis is performed under relatively mild conditions (T = 500°C) and is complete in a few hours. The reactants are powdered BaS, Me (Me: Zr, Hf) and S in a ratio 1:1:3, mixed and sealed under vacuum in borosilicate glass ampoules ...
Lorenza Romagnoli +5 more
wiley +1 more source