Ultramicroelectrode
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Scanning Electrochemical Microscopy (SECM) Study of the Electrochemical Behavior of Anodized AZ31B Magnesium Alloy in Simulated Body Fluid
In this work, scanning electrochemical microscopy (SECM) was employed to study the corrosion behavior of anodized AZ31B magnesium alloy exposed to simulated body fluid. SECM measurements were carried out in surface generation/tip collection mode. The hydrogen evolution flux caused during corrosion of the magnesium alloy was oxidized at the ultra-microelectro
Mat. Res.. Publicado em: 28/10/2019
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2. Ultramicroelectrode array behavior of electrochemically partially blocked boron-doped diamond surface
Demonstra-se, pela primeira vez usando experimentos simples de voltametria cíclica, que a pré-polarização anódica de eletrodos de diamante dopado com boro (DDB) conduz a superfícies parcialmente bloqueadas. Eletrodos de DDB anodicamente pré-polarizados, com diferentes níveis de dopagem de boro, apresentaram respostas de voltametria cíclica sigmoidai
J. Braz. Chem. Soc.. Publicado em: 2013-07
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3. Remocao de cobre (II) em eletrodos de platina-polipirrol e carbono vitreo reticulado
A remoção de íons Cu²+ de soluções ácidas diluídas é investigada utilizando eletrodos de Pt recobertos com polipirrol previamente reduzido (PPl) e eletrodos de carbono vítreo reticulado (CVR). O estudo tem por objetivo a redução de Cu²+ sobre ppl via reação espontânea e eletroredução a -0,40 V vs. eletrodo de calomelano saturado (ECS), e a
Publicado em: 2010
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4. Determinação sequencial de nitrato e nitrito por voltametria de pulso diferencial empregando um ultramicroeletrodo de ouro / Sequential determination of nitrate and nitrite by differential pulse voltammetry using a gold ultramicroelectrodo
Este trabalho descreve o desenvolvimento de um método eletroanalítico para determinação sequencial de nitrito (NO2-) e nitrato (NO3-), utilizando como técnica, a voltametria de pulso diferencial. O método se baseia na redução eletroquímica dos íons nitrato sobre um ultramicroeletrodo de ouro modificado in situ com cádmio depositado em regime de su
Publicado em: 2010
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5. Electrochimie analytique en absence d'electrolyte indiferent : transports de matiere lors de la reduction des acides a une ultramicroelectrode
Resumo não disponível.
Publicado em: 2007
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6. "Application of voltametric and HPLC techniques on the monitorins of organic acids production in fermented milk samples by Kefir and Tibet grains" / "Monitoramento da produção de ácidos orgânicos em amostras de leite fermentado pelos grãos de Kefir e do Tibet utilizando técnicas voltamétricas e HPLC"
The products formed during the milk fermentation using the kefir and tibet grains (popularly known species) were studied in this work. The kefir grain is a symbiotic association of microorganisms that includes several species of lactic acid bacteria (Lactobacillus, Lactococcus, Leuconostoc), yeasts (Saccharomyces cereviseae) and acetic acid bacteria (Acetoba
Publicado em: 2006
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7. Determination of ranitidine in drugs using a mercury coated platinum ultramicroelectrode and hanging mercury dropping electrode
O comportamento voltamétrico da ranitidina foi estudado em meio aquoso utilizando um ultramicroeletrodo de platina com eletro-depósito de mercúrio (Hg-UME) e o eletrodo de gota pendente de mercúrio, HMDE. A voltametria de varredura linear (LSV) mostrou que o composto apresenta duas ondas de redução em pH < 4,0 e somente uma em pH > 4,0, sendo as ondas
J. Braz. Chem. Soc.. Publicado em: 2003-04
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8. Voltametria de onda quadrada. Primeira parte: aspectos teóricos
The theoretical aspects of square wave voltammetry were discussed. Reversible, irreversible and quase-reversible electrode reactions were analyzed and the correlations between parameters like frequency, period, square wave potential and amplitude were showed. In this way, diagnostic relationships allow to characterize the electrode process. The analytical ap
Química Nova. Publicado em: 2003-01
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9. Application of scanning electrochemical microscopy to biological samples.
The scanning electrochemical microscope can be used in the feedback mode in two-dimensional scans over biological substrates to obtain topographic information at the micrometer level. In this mode, the effect of distance between a substrate (either conductive or insulating) and a scanning ultramicroelectrode tip on the electrolytic current flowing at the tip
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10. Effects of ultramicroelectrode dimensions on the electropolymerization of polypyrrole
Anode geometry can significantly affect the electrochemical synthesis of conductive polymers. Here, the effects of anode dimensions on the electropolymerization of pyrrole are investigated. Band microelectrodes were prepared with widths ranging from 2 to 500 μm. The anode dimension has a significant effect on the resulting thickness of polymer film. The ele
American Institute of Physics.
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11. Manipulating the genetic identity and biochemical surface properties of individual cells with electric-field-induced fusion
A method for cell–cell and cell–liposome fusion at the single-cell level is described. Individual cells or liposomes were first selected and manipulated either by optical trapping or by adhesion to a micromanipulator-controlled ultramicroelectrode. Spatially selective fusion of the cell–cell or cell–liposome pair was achieved by the application of a
The National Academy of Sciences.
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12. Introducing phase analysis light scattering for dielectric characterization: measurement of traveling-wave pumping.
Phase analysis light scattering (PALS) was applied to characterize a high-frequency traveling-wave (TW) micropump. Field strength and frequency characteristics were measured for aqueous solutions up to 40 MHz and conductivities of 16 mS/m. The TW field was generated by an ultramicroelectrode array of intercastellated electrodes, which were driven by square-t