Platinum
Mostrando 13-24 de 461 artigos, teses e dissertações.
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13. Brasil, Paraguai, Argentina e Chile / Rota Bioceânica: relações culturais no território vivido
Resumo: O presente artigo tem como objeto de estudo os países da América Platina envolvidos na Rota Bioceânica e suas relações culturais de vizinhança. O estudo analisa as culturas materiais e imateriais que permeiam este espaço e seus entrelaçamentos na conexão entre o Centro-Oeste brasileiro e o Pacífico. Assim, não basta o foco sobre as questõ
Interações (Campo Grande). Publicado em: 05/09/2019
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14. Addition of CeO2 Nanorods in PtSn-Based Electrocatalysts for Ethanol Electrochemical Oxidation in Acid Medium
This work describes the preparation of Pt/C, PtxSny/C and PtxSny(CeO2 nanorods/C) nanoparticle catalysts synthesized by the chemical reduction method via sodium borohydride for the ethanol oxidation reaction. Using X-ray diffractogram analysis, it was verified that no alloy formation occurred between platinum (Pt) and tin (Sn). The distribution of the nanopa
J. Braz. Chem. Soc.. Publicado em: 12/08/2019
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15. EFFECT OF THE NATURE OF THE ELECTROLYTE AND THE NATURE OF THE INTERFACE ON THE HYDROGEN EVOLUTION POTENTIAL: EXPERIMENTS FOR CHEMISTRY STUDENTS
This work presents an experiment done for chemistry students about the effect of the nature of the electrolyte and the nature of the interface on the hydrogen evolution reaction by electrolysis. Two techniques are suggested: method A - two identical copper electrodes in a direct current circuit and method B - three different electrodes in a dc potentiostatic
Quím. Nova. Publicado em: 27/05/2019
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16. Impacto econômico da construção sustentável: a reforma do Estádio do Mineirão
Resumo O objetivo deste artigo é mensurar o impacto econômico da adoção do conceito de construção sustentável no projeto do Estádio do Mineirão. O método empregado nesta pesquisa de natureza qualitativa e com abordagem exploratória é o da pesquisa documental ex-post-facto , já que os dados secundários foram obtidos por meio de informações pu
urbe, Rev. Bras. Gest. Urbana. Publicado em: 14/02/2019
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17. Recombination Study of Dye Sensitized Solar Cells with Natural Extracts
Natural dyes can be used in dye sensitized solar cells (DSSCs) to generate low-cost devices, although with low light harvesting because of energy losses from the recombination process. This study investigates recombination reactions in DSSCs with natural dyes extracted from eggplants, plums, and hibiscus flowers. Titanium dioxide films were coated on a fluor
J. Braz. Chem. Soc.. Publicado em: 2019-02
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18. Influence of surfactants addition on the properties of calcium hypochlorite solutions
Abstract Objectives The aim of this study was to evaluate the influence of surfactants 0.2% or 0.1% cetrimide (Cet) or 0.008% benzalkonium chloride (BAK) on 2.5% calcium hypochlorite (Ca(OCl)2), and compare to sodium hypochlorite (NaOCl), regarding the properties of pH, free chlorine content, surface tension, contact angle, pulp dissolution and antimicrobia
J. Appl. Oral Sci.. Publicado em: 07/01/2019
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19. Adsorción y oxidación de monóxido de carbono en una lamina de ß-grafino: Estudio teórico
ABSTRACT This work presents a study, based on the Density functional theory (DFT), of the adsorption and oxidation of CO on a free platinum catalyst constituted from a sheet of Graphyne. Graphyne is a new allotrope of carbon, its structure is two-dimensional and is constituted by a monolayer of carbon atoms with sp-sp2 hybridization. Depending on the differe
Matéria (Rio J.). Publicado em: 19/07/2018
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20. CONSIDERAÇÕES SOBRE TEXTOS QUE TRATAM DO DESENVOLVIMENTO DE METALOFÁRMACOS DE RUTÊNIO
It is relatively easy to verify that literature focused on the planning and investigation of ruthenium complexes biological properties (and their possible application as metallodrugs) has assumed certain generalizations that have been systematically repeated, mainly with respect to parallelisms and antagonisms with the chemistry of iron and platinum. This wo
Quím. Nova. Publicado em: 2018-07
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21. Nanoporous Gold Surface: An Efficient Platform for Hydrogen Evolution Reaction at Very Low Overpotential
A nanostructured porous gold film (NPGF) was fabricated onto a gold electrode surface by an electrochemical approach involving anodization followed by electrochemical reduction in absence of binary alloys, templates and chemical reducing agents. The electrocatalytic activity of the as-fabricated electrocatalyst was examined towards hydrogen evolution reactio
J. Braz. Chem. Soc.. Publicado em: 2018-02
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22. A Straightforward Method for Determination of Al and Na in Aluminosilicates Using ICP OES
The improvements on aluminosilicates dissolution through microwave-assisted acid decomposition procedures for Na and Al quantification by inductively coupled plasma optical emission spectrometry (ICP OES) are reported here. Complete dissolution of the samples is achieved employing 4 mL of HNO3 and 3-4 mL of HF thus reducing the total amount of these reactant
J. Braz. Chem. Soc.. Publicado em: 2017-08
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23. Ethylene glycol oxidation on ternary PtRhNi/C electrocatalyst with different metal compositions
ABSTRACT Direct Alcohol Fuel Cells (DAFC’s) are an alternative to fuel cell systems and when is used alkaline medium this has an increase performance. The alkaline direct alcohol fuel cells (ADAFC's) have some advantages such as low-emission, high energy efficiency, improved oxidation kinetics, low crossover and in addition there is a broad range of materi
Matéria (Rio J.). Publicado em: 20/07/2017
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24. Ethylene Glycol Electro-Oxidation on Platinum-Free Surfaces: How the Composition of PdRuRh Surfaces Influences the Catalysis
In this work we performed electrochemical (cyclic voltammetry and chronoamperommetry) and spectroelectrochemical studies (in situ Fourier transform infrared (FTIR)) in PdRuRh electrodeposits in acidic media in presence of ethylene glycol (0.5, 1.0 and 2.0 mol L-1). The electrochemical results show that the ethylene glycol oxidation is sensitive to the compos
J. Braz. Chem. Soc.. Publicado em: 2017-06