Synthesis and Characterization of Reduced Graphene Oxide/ Polyaniline/Au Nanoparticles Hybrid Material for Energy Applications

In this work, synthesis and characterization of reduced graphene oxide/polyaniline/Au nanoparticles (GO/PANI/NpAu) as a hybrid capacitor are presented. Graphite oxide (GO) was synthesized by a modified Hummer’s method. Polyaniline was synthesized by chemical polymerization, and Au nanoparticles (NpAu) were added afterward. Fabrication of the electrodes consisted on the hybrid materials being deposited on carbon cloth electrodes. The chemical and structural properties of the electrode were characterized by high-resolution scanning electron microscopy (HRSEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (X-R), and Raman spectroscopy; the results confirm the graphene reduction, the covalent functionalization, and formation of nanocomposites and also show the polyaniline grafted graphene. The performance and evaluation of the electrodes based on grapheme oxide (GO), polyaniline (PANI), GO-PANI, and GO/PANI/NpAu nanocomposites over carbon cloth, stainless steel, and copper have been obtained in 1 M H2SO4 solution, using electrochemical techniques namely: cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). They showed that GO/PANI/NpAu gave higher specific capacitance (SC) and energy values than PANI, and GO/PANI, in the order of 160 F/g. The present study introduces new hybrid material for energy applications, from the evaluation of their electrical contributions

Preparación y caracterización del complejo polianilina-fluconazol, como pigmento en un recubrimiento anticorrosivo

Se preparó una película protectora del proceso de corrosión del acero al carbono en medio neutro, utilizando la polianilina en su forma emeraldina base (PANIB) como matriz para dispersar un inhibidor (fluconazol). Para comprender el reconocimiento molecular en la formación de este complejo, se modeló computacionalmente la interacción de la emeraldina base con el fluconazol a partir de estudios de acoplamiento (docking). Después de la caracterización de los materiales mediante el modelo mencionado y técnicas como FTIR y DRX, se realizaron pruebas de Espectroscopia de Impedancia Electroquímica para evaluar la conducta protectora del complejo polianilina base-fluconazol (PANIB-F). Los resultados del modelo indicaron una débil interacción entre PANIB y el fluconazol, sin embargo, para efectos de protección del metal esto parece ser favorable.A protective film for mild Steel in neutral solution was prepared using polyaniline in its emeraldina base form (PANIB) as a matrix, in which, expired fluconazole as inhibitor was dispersed. In order to investigate the molecular recognition underlying this phenomenon (the formation of the complex), we developed a computational model for the interaction of the emeraldine base with fluconazole by docking analysis. The materials characterization was performed using FTIR and XRD techniques, and the anticorrosion behavior of the PANIB-F complex was studied at room temperature using electrochemical impedance spectroscopy. The docking model results indicated a weak interaction between PANI-B and fluconazole; however, for the metal protection purposes those results were favorable

El registro arqueometalúrgico como herramienta para conservar la información del patrimonio arquitectónico en Málaga, España

This work approaches views on the preservation of industrial housing heritage in Malaga, Spain, and the pressure caused by its recent urban renovation. The aims of the research include geographic space analysis and assessing how archaeological recording and archaeometry, specifically archaeometallurgy, can contribute to the preservation of information about structures and materials that continuously disappear from urban contexts. The results constitute an initial beginning to expand a comparative archaeological database for the city. The ideas and procedures presented here are expected to provide some guidance for generating further research from urban, architectural, archaeological, and geographical perspectives.Este trabajo aborda visiones sobre la conservación del patrimonio industrial de la vivienda en Málaga, España, y la presión provocada por su renovación urbana. Los objetivos incluyen el análisis del espacio geográfico y evaluar cómo el registro arqueológico y la arqueometría, específicamente la arqueometalurgia, pueden contribuir a la preservación de información sobre estructuras y materiales que desaparecen de los contextos urbanos. Los resultados constituyen un comienzo para elaborar una base de datos arqueológicos comparativos para la ciudad. Se espera que las ideas y los procedimientos brinden una guía para generar más investigaciones desde perspectivas urbanas, arquitectónicas, arqueológicas y geográficas

PRODUCTION OF FeAl NANOSTRUCTURED ALLOY BY MECHANICAL ALLOYING AND ITS MICROSTRUCTURAL CHARACTERIZATION

In this work, a Fe40Al alloy was produced by the mechanical alloying technique, from a mixture of elemental powders constituted by Fe and Al, using different milling times. The evolution of size and morphology of powders depending on the milling time was characterized by scanning electron microscopy. The X-Ray Diffraction technique was utilized in order to characterize the crystalline structure evolution depending on the milling time. The Fe40Al alloy with a body centered cubic crystal structure was formed at 20 h of milling time. Besides, this alloy acquired a disordered crystal structure with a Nano metric grain size. The Nano metric grain size of disordered Fe40Al alloy was decreased at the same time as the milling time transcurred, while its lattice parameter was increased