Microelectrode
Mostrando 1-12 de 359 artigos, teses e dissertações.
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1. Voltammetric Generation and Kinetic Stability of Nitro Anion Radical from Nitrofurazone in Ionic Liquids
The nitrofurazone (NF) electrochemical reduction has been studied by cyclic voltammetry (CV) and square wave voltammetry (SWV) in non-aqueous medium using three different ionic liquids (IL): BMImTf2N, BMImBF4 and BMMImTf2N, having a carbon fiber microelectrode as working electrode. In all of them, two reversible cathodic peaks were recorded for NF. Under hig
J. Braz. Chem. Soc.. Publicado em: 2021-04
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2. 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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3. Influence of chlorhexidine and zinc oxide in calcium hydroxide pastes on pH changes in external root surface
Abstract The objective of this study was to assess the influence of chlorhexidine (liquid and gel) and zinc oxide in calcium hydroxide (CH) pastes on root pH in simulated external resorption. One hundred human anterior teeth with a single root canal were selected. After decoronation and root canal instrumentation, the specimens were divided into 4 experiment
Braz. oral res.. Publicado em: 11/02/2019
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4. Thermodynamic simulation of phosphate precipitation based on ion-selective microelectrode measurements
Soluções simuladoras do fluido corpóreo (SBFs) são usadas em avaliação de biocompatibilidade de biomateriais e também como processo de recobrimento alternativo à aspersão por plasma. Processos biomiméticos ocorrem heterogeneamente sobre superfícies metálicas; portanto, o uso da técnica de microeletrodo é muito recomendável para detectar mudan�
J. Braz. Chem. Soc.. Publicado em: 2013-06
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5. Avaliação da corrosividade do etanol combustível utilizando arranjo de microeletrodos / Corrosion evaluation in ethanol fuel using microelectrodes array
This work presents an investigation on the corrosion of cooper metal, using a microelectrode array building using lithography technique. The influence of microelectrode array area was investigated on the ohmic drop and resistance of ethanol. The results were then compared with existing theoretical methodologies and good agreements were found. It was conclude
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/03/2012
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6. Ações da epitestosterona através de um mecanismo de membrana em células de Sertoli : implicações no desenvolvimento sexual
Introduction: Epitestosterone is the 17¿-epimer of testosterone. It seems to possess an antiandrogenic activity, as well as a neuroprotective effect. The mechanism of action of epitestosterone has not been elucidated. Objective: The aim of this work is to investigate the non-classical effect of epitestosterone on the membrane of Sertoli cells from testis of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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7. Desenvolvimento de sensor eletroquímico para monitoramento de chumbo em resíduos de disparos de armas de fogo / Development of an electrochemical sensor for lead analysis in gunshot residues
Duas metodologias distintas foram desenvolvidas para a determinação de chumbo em Resíduos de Disparos de Armas de Fogo (RDAF) utilizando microeletrodo de ouro. Na primeira delas, a superfície eletródica foi modificada com filme de bismuto em meio alcalino (pH = 13) e na outra as análises foram realizadas com microeletrodo não modificado em meio ácido
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/08/2011
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8. Fabricação de microeletrodos para aplicações em microscopia eletroquímica de varredura / Fabrication of microelectrodes for applications in scanning electrochemical microscopy
In this study, platinum microelectrodes were fabricated with a Micropipette Puller and used in Scanning Electrochemical Microscopy (SECM) to obtain information on the acid erosion of tooth enamel. The sealing and polishing of the active area of the fabricated devices are considered critical steps in the construction process, hence a vacuum pump was used to e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/08/2011
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9. Determinação da densidade de corrente de corrosão em meios de baixa condutividade: uso de microeletrodos para minimizar a queda ôhmica
The gravimetric and electrochemical tests are the most common techniques used in determining the corrosion rate. However, the use of electrochemical polarization is limited to electrolytes with sufficient conductivity for which Tafel curves are linear. In this study, we investigated a technique in which working microelectrodes of AISI 1020 steel were used to
Química Nova. Publicado em: 2011
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10. Estudo da corrosão do cobre em meios de sulfato e de cloreto com auxílio do microeletrodo com cavidade e de uma microcélula. / Étude de la corrosion du cuivre en milieu sulfate et chlorure au moyen de la microélectrode à cavité et de la microcellule électrochimique.
Le but de ce travail est létude de la corrosion du cuivre pur et du cuivre recouvert dune couche de patine artificielle développée dans une solution de sulfate. Ces études ont été menées dans des solutions contenant des espèces agressives caractéristiques de latmosphère de la ville de São Paulo (Brésil), à savoir les íons chlorure, sulfate et a
Publicado em: 2011
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11. AVALIAÇÃO DO POTENCIAL ACIDOGÊNICO DO LEITE MATERNO EM CRIANÇAS COM DIFERENTES EXPERIÊNCIAS DE CÁRIE / ASSESSMENT OF POTENTIAL ACIDOGENIC OF BREASTMILK CHILDREN WITH DIFFERENT EXPERIENCES OF CARIES
Given that breastfeeding after 1 year old has been reported by some studies as a risk factor for early childhood caries (ECC), and it is unknown whether breast milk is metabolized in a structured oral biofilm in children with ECC leading to pH drops, the objective of this study was to evaluate the milk acidogenic potential in oral biofilm of non-exclusive in
Publicado em: 2010
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12. Isolation and structural and functional characterization of Ts15, a new neurotoxin from the venom of the scorpion Tityus serrulatus / Isolamento e caracterização estrutural e funcional da Ts15, uma nova neurotoxina da peçonha do escorpião Tityus serrulatus
Os escorpiões são um dos grupos de animais mais antigos da Terra. Eles são artrópodes e pertecem a classe Arachinida e Ordem Scorpionida. A família Buthidae compreende as espécies responsáveis pelos acidentes graves em humanos, incluindo a espécie Tityus serrulatus, o maior responsável por esses acidentes no Brasil. A peçonha do T. serrulatus cont�
Publicado em: 2010