Copper Electrode
Mostrando 25-36 de 82 artigos, teses e dissertações.
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25. A influência do fósforo na toxicidade de cobre e composição bioquímica de Chlorella vulgaris
Metal toxicity to microalgae is dependent on environmental conditions, evolutionary history of the microalgae, and previous exposure of the organism to the specific metal. Also, it is importantly influenced by the physiological condition of the algae in the moment of metal exposure. In this research we investigated several combinations of phosphorus (P) and
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/09/2011
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26. Construção de uma plataforma funcional para detecção amperométrica de cisteína / Construction of a functional platform for amperometric detection of cysteine
This work describes the fabrication of an amperometric sensor for electrocatalytical detection of cysteine. The developed sensor is based on a functional platform for complexing copper ions on multi-walled carbon nanotubes (MWCNTs) modified with poly-4-vinylpyridine through an in situ reaction of polymerization. A multivariate analysis using a central compos
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/08/2011
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27. Fabricação de sensores eletroquímicos para a determinação de espécies químicas de relevância ambiental / Fabrication of electrochemical sensors for determination of chemical species of environmental relevance
Neste trabalho são apresentados resultados relacionados à determinação de nitrato, nitrito e amônio por técnicas eletroquímicas. Para a determinação de nitrato foi utilizada uma lâmina de cobre cuja superfície é renovada continuamente empregando um processo de ativação (oxidação do cobre e subseqüente redução de íons Cu(II)) com potencial
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/04/2011
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28. Aspects on the optimization of die-sinking EDM of tungsten carbide-cobalt
At present, due to their properties, the tungsten carbide-cobalt (WC-Co) composite materials are in huge demand by industry to manufacture special tools, dies/molds and components under erosion. The powder metallurgy is the usual process applied to obtain WC-Co products, but in some cases this process is unable to produce tools of very complex shapes and hig
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-12
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29. AVALIAÇÃO VOLTAMÉTRICA DOS ÍONS METÁLICOS (COBRE, CÁDMIO E CHUMBO) EM AMOSTRAS DE COMBUSTÍVEIS PREVIAMENTE DIGERIDAS EM MICROONDAS USANDO ELETRODO QUIMICAMENTE MODIFICADO POR SAIS TETRAZÓLIOS / EVALUATION OF METAL IONS VOLTAMMETRY(COPPER, CADMIUM AND LEAD) IN SAMPLES OF FUELS PREVIOUSLY DIGESTED IN USING MICROWAVE ELECTRODE CHEMICALLY MODIFIED BY SALTS TETRAZOLIUM.
This paper describes an analytical procedure for determination of trace metals copper, cadmium and lead in fuel samples, using Basal Plane Pyrolytic Graphite Modified Electrode (BPPGME) by tetrazolium salts: ([3,3 - (3-3 -dimethoxy-4, bifenililen 4 -bis [2 - (4-nitrophenyl)-5-phenyl-2H-tetrazolium (NBT) Cl 3 - (4,5 - dimetitiazol-2il) -2,5-diphenyl-2H-Tetraz
Publicado em: 2010
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30. Electrochemical studies of cooper, nickel and a Cu55/Ni45 alloy in aqueous sodium acetate
This paper discusses the electrochemical behavior of copper, nickel and a copper/nickel alloy in aerated aqueous 0.10 and 1.0 mol L-1 sodium acetate. The data obtained from different electrochemical techniques were analyzed to determine the influence of Ni and Cu on the electrochemical processes of the alloy electrode. The shapes of the potentiodynamic I(E)
Publicado em: 2010
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31. Electrochemical studies of copper in N-N, dimethylformamide in the presence of water, ethanol and acetic acid as additives
Neste trabalho são apresentados os resultados da avaliação do comportamento eletroquímico do eletrodo de cobre em N-N dimetilformamida na presença de água, etanol e ácido acético, por voltametria cíclica. O processo de eletrooxidação do eletrodo se inicia no potencial de -0,20 V(ECS). Durante a varredura anódica de potencial foram observados dois
Publicado em: 2010
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32. Comparação dos processos de eletrodeposição de íons cobre usando reatores de leito fluidizado e leito de jorro
In this work was studied the process of removal of ions has covered simulated effluent gifts in watery having used electrochemical reactor of fluidized stream bed and of stream bed of I gush out whose porous cathodes were composites for conducting copper particles. Applying an factorial planning Box-Behnken the effect of the electric chain had been studied,
Publicado em: 2010
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33. SIMULTÂNEA DE METAIS EM BIODIESEL, POR VOLTAMETRIA DE REDISSOLUÇÃO ANÓDICA USANDO ELETRODO DE FILME DE MERCÚRIO EM MEIO ALCÓOLICO / SIMULTANEOUS METAL IN BIODIESEL BY VOLTAMMETRY ANODIC STRIPPING USING MERCURY FILM ELECTRODE IN ALCOHOLIC MEDIUM
Diferential pulse and square wave anodic stripping voltammetry at the mercury film electrode, prepared in the ex-situ and in-situ modes, showed an adequate analytical performance and were employed for the development of a procedure for analysis of Biodiesel. Samples were simply diluted into a methanol solution to a final concentration of 0.33 mol L-1 (v/v) a
Publicado em: 2010
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34. Estudo da interação de íons cobre e cromo com eletrodos de pasta de carbono modificada e polianilina em meio aquoso por técnica de voltametria de pulso diferencial / Modified Carbon Paste Electrodes and Polyaniline Electrodes: Study of their interaction with copper and chromium aquous metallic ions by Differential Pulse Voltammetry
The electrochemical sensors to measure metallic ions in water and waste water are among the most important areas of research nowadays. The environmental control and monitoring chalenges that stimulated the aim of this work are tanification for industrial leather finishing and cuprous and cupric organic and inorganic fungicides. The features for characterizat
Publicado em: 2010
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35. Desenvolvimento e estudo físico-químico de compósitos de nanotubos de carbono / Physical chemical study and development of carbon nanotubes composites
This thesis presents for the first time nitrogen-cup-stacked carbon nanotubes with hydrophilic and semiconducting properties synthesized by alcohol precursor. The hybrid carbon fiber/carbon nanotubes composite have three-dimensional geometry and nanostructure. The material was prepared via fixed-bed chemical vapor deposition reactor. In this process nitrogen
Publicado em: 2010
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36. Use of biomimetic systems at the preparation of amperometric sensors / Utilização de sistemas biomiméticos no Preparo de sensores amperométricos
This work describe the immobilization of the copper(II) dinuclear complex ([Cu2(apyhist)2Cl2](ClO4)2), (apyhist =[(4-imidazolyl)ethylene-2-amino-1-ethylpyridine]), and others similar copper(II) compounds mono- and tetranuclears, obtained in water solution or for desprotonation of the imidazole ligant, in the Nafion membrane on glass carbon electrode surface,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/09/2009