Electrodeposition
Mostrando 37-48 de 128 artigos, teses e dissertações.
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37. Implication of low temperature and sonication on electrocrystallization mechanism of Cu thin films: a kinetics and structural correlation
The effect of an ultrasonic environment during electrodeposition of copper on graphite at various electrolyte temperatures of 25, 20, 15, 10 and 5 °C is reported in this investigation. Resulting Cu deposits formed by potentiostatic deposition were characterized by electrochemical methods, scanning electron microscopy and atomic force microscopy. It was foun
Mat. Res.. Publicado em: 28/01/2013
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38. Kinetical study about the cobalt electrodeposition onto polycrystalline platinum
An electrochemical study of Co electrodeposition onto polycrystalline Pt from an aqueous solution containing 10-2 M CoCl2 + 1 M NH4CI (pH = 9.3) was conducted at overpotential conditions. The current density transients showed two maxima that corresponded to two nucleation and growth processes. The entire transient behavior was adequately predicted considerin
Quím. Nova. Publicado em: 2013
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39. Eletro-oxidação de glicerol sobre eletrodos de platina modificados com hidróxido de cobalto
The increased production of biodiesel has resulted in the overproduction of glycerol that has generated fear of improper disposal, due to low market value of the product and consequent lack of interest. Glycerol, discovered in 1779 by Scheele, is used industrially in the production of over 1500 products such as toiletries, cosmetics, food, beverages and poly
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/04/2012
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40. Desenvolvimento e caracterização de um banho nãocianetado para a eletrodeposição de ligas de Fe-Mo : caracterização dos filmes de Fe-Mo / Study of electrodeposition of fe-mo alloy from slightly alkaline solutions containing nta nitrile sodium acetate
Ligas de Fe-Mo foram eletroquimicamente depositadas sobre substrato de Pt a partir de uma solução levemente alcalina (pH = 8,0) contendo FeCl3, Na2MoO4 e nitrilotriacetato de sódio (NTA). Os ions Fe3+ foram dissolvidos para formar os complexos [Fe(OH)(NTA)]-, [Fe(OH)2(NTA)]2-, [Fe(NTA)2]3- ou [Fe2O(NTA)2]2- para 0,110 mol L-1 e 0,055 mol L-1 de NTA em sol
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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41. Statistic evaluation of cysteine and allyl alcohol as additives for Cu-Zn coatings from citrate baths
In the present work, cysteine and allyl alcohol were added to citrate baths as additives to Cu-Zn coatings on steel substrates. In order to verify the effects of the deposition parameters (current density, mechanical stirring speed, and additives) on the coating composition, electrochemical behavior, morphology, and microstructure properties of Cu-Zn coating
Mat. Res.. Publicado em: 18/12/2012
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42. Electrodeposition of ZnO from DMSO solution: influence of anion nature and its concentration in the nucleation and growth mechanisms
A influência da natureza aniônica e sua concentração na eletrodeposição de ZnO em um eletrodo de ouro de soluções de dimetilsulfóxido (DMSO) foi estudada. Experimentos voltamétricos mostraram alterações importantes no processo de eletrodeposição de óxido de zinco dependendo do ânion empregado como eletrólito. A partir de experimentos de cron
Journal of the Brazilian Chemical Society. Publicado em: 2012-03
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43. Copper electrodeposition on glassy carbon and highly oriented pyrolytic graphite substrates from perchlorate solutions
In present work, we analyzed the copper electrodeposition onto GCE (System I) and HOPGE (System II) from perchlorate solutions. The current density transients obtained from system I and II were well described through a kinetic mechanism that involves four different contributions: (a) a Langmuir type adsorption process, b) an electron transfer from Cu2+→Cu+
Química Nova. Publicado em: 2012
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44. Fatores que influenciam a formação da fase β-PbO2 em filmes eletrossintetizados galvanostaticamente sobre substrato de tecido de carbono
PbO2 films were electroformed onto carbon cloth substrates (twill woven type) in acid conditions using the nitrate precursor by changing the electrodeposition current density, temperature and pH, in order to optimize the formation of the β-PbO2 phase. The crystal structure and morphology of the PbO2 films were investigated using X-ray diffraction (XRD) and
Química Nova. Publicado em: 2012
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45. Influência do eletrólito na eletrodeposição de nanopartículas de Cu sobre eletrodo de diamante dopado com boro
This paper presents the electrolyte influence on deposition and dissolution processes of Cu nanoparticles on boron doped diamond electrodes (BDD). Morphological, structural and electrochemical analysis showed BDD films with good reproducibility, quality and reversible in a specific redox system. Electrodeposition of Cu nanoparticles on DDB electrodes in thre
Química Nova. Publicado em: 2012
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46. Fotoeletrodegradação do corante AO7 utilizando filmes de nanocompósitos de ZnO-TiO2
The Zn-TiO2nanocomposite films were prepared by electrodeposition, using an acidic zinc sulphate solution with TiO2 nanoparticles in suspension. The as-deposited samples have been heated in air at 450 ºC for 6 h. The XRD and SEM analyses pointed out to the metal matrix conversion from Zn to ZnO and a rich morphology of needles-shaped grains. These materials
Química Nova. Publicado em: 2012
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47. Análise de cobertura de metal-metal por XRF / Analysis metal casing metal by XRF
A proposta do referente estudo foi medir a espessura do depósito de um metal em outro metal base, ou seja, utilizar o processo eletroquímico de Galvanoplastia ou eletrodeposição deste metal, por meio da técnica de fluorescência de raios X (XRF). O uso desta técnica justificou-se pelo interesse em reduzir os custos excessivos durante o processo eletroq
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/10/2011
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48. Preparação e caracterização eletroquímica de filmes finos de nanotubos de carbono depositados sobre ITO / Preparation and electrochemical characterization of thin films of carbon nanotubes deposited on ITO
In this work were carried out some studies on electrochemical properties of carbon nanotubes (CNT) thin films deposited on ITO (Indium Tin Oxide) electrodes by electrophoretic deposition (EPD). Capacitance and electrochemical area measurements were made with films of three types of nanotubes with different dimensions and previous treatments. All measurements
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/07/2011