Pyrolytic Graphite
Mostrando 1-12 de 23 artigos, teses e dissertações.
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1. Efecto electrocatalítico de nanopartículas bimetálicas de Ag y Cd hacia la reducción de iones nitrato y/o nitrito
ABSTRACT The electrocatalytic effect of Cd-Ag bimetallic nanoparticles supported on highly oriented pyrolytic graphite (HOPG) and vitreous carbon (VC) substrates was evaluated for the nitrate and/or nitrite ions reduction reaction. For this, in a first stage, the metallic and bimetallic deposits were obtained on the carbonaceous substrates (CS) using the ele
Matéria (Rio J.). Publicado em: 19/07/2018
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2. DETERMINAÇÃO DE ÁCIDO LIPÓICO SOBRE ELETRODO DE GRAFITE PIROLÍTICO MODIFICADO COM FTALOCIANINA DE COBALTO / DETERMINATION OF LIPOIC ACID ON PYROLYTIC GRAPHITE ELECTRODE MODIFIED WITH COBALT PHTHALOCYANINE
Lipoic acid, also known as thioctic acid is a compound organosulfur derived from octanoic acid, which is a saturated fatty acid. It is an antioxidant that has the property of suppressing free radicals in both aqueous and lipid environment, which differs from other antioxidants. Nowadays, various techniques are employed for determining the lipoic acid such as
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/07/2012
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3. 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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4. Estudo das propriedades eletrônicas e estruturais de defeitos topológicos e fronteiras de grão em grafeno primeiros princípios
Nesta tese, realizamos cálculos de primeiros princípios, baseados na Teoria do Funcional da Densidade de Kohn-Sham, com a aproximação do pseudopotencial, para investigar a energética e as propriedades eletrônicas e estruturais de grafeno policristalino e de grafeno contendo defeito topológicos. A motivação para esse trabalho decorre de serem frontei
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/08/2011
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5. Electrochemical feasibility study of methyl parathion determination on graphite-modified basal plane pyrolytic graphite electrode
Um método eletroquímico de baixo custo foi desenvolvido para a determinação de traços de metil paration (MP) baseado nas propriedades do eletrodo de grafite pirolítico de plano basal modificado com grafite (grafite-bppg). A combinação do grafite-bppg com voltametria de onda quadrada (VOQ) resultou em um método eletroquímico seletivo, sensível e or
Journal of the Brazilian Chemical Society. Publicado em: 2011
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6. Cobalt electrodeposition onto highly oriented pyrolytic graphite (HOPG) electrode from ammonium sulfate solutions
It was carried out an electrochemical study of the cobalt electrodeposition onto HOPG electrode from an aqueous solution containing 10-2 M of CoSO4 + 1M (NH4)2SO4. Nucleation parameters such as nucleation rate, density of active nucleation sites, saturation nucleus and the rate constant of the proton reduction reaction (kPR) were determined from potentiostat
Química Nova. Publicado em: 2010
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7. 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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8. Giant superconducting proximity effect in graphite / Efeito de proximidade gigante entre supercondutor e grafite
In order to verify the existence of superconducting correlations in graphite, in this work we studied the possibility of the so-called giant proximity effect in highly oriented pyrolytic graphite (HOPG) samples. Magnetoresistance measurements performed on various thoroughly characterized HOPG samples with attached superconducting In or Pb-In electrodes revea
Publicado em: 2009
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9. Employment of cathodes of diffusion of oxygen in eletrotrolise of brine to produce chlorine / Emprego de catodos de difusão de oxigenio na eletrolise da salmoura para a produção de cloro
This work is investigating the performance of electrodes modified with gaseous diffusion of particles of Cu, for reduction of oxygen in the production of chlorine during the electrolysis of brine. Initially, the reaction was studied on the anodic oxidation of chloride ion. Using a single cell compartment, with the type DSA anode with an area of 1.5 cm2 as wo
Publicado em: 2009
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10. DETERMINAÇÃO DE HIDRAZINA POR VOLTAMETRIA DE ONDA QUADRADA SOBRE ELETRODO DE GRAFITE MODIFICADO COM FeTPyPz / HYDRAZINE DETERMINATION FOR VOLTAMMETRIC OF SQUARE SHAPED WAVE ON GRAPHITE ELECTRODE MODIFIED WITH FeTPyPz
In this work, the determination of hydrazine (N2H4) in aqueous solutions was investigated by voltammetric techniques on pyrolytic graphite electrodes (GP) before and after modification with iron tetra-pyridinoporphyrazine (FeTPyPz). The modified electrode GP/FeTPyPz presented higher oxidation currents and better voltammetric profiles in comparison with the u
Publicado em: 2007
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11. DETERMINAÇÃO DO HERBICIDA PARAQUAT SOBRE ELETRODOS DE GRAFITE PIROLÍTICO MODIFICADOS COM FTALOCIANINA DE COBALTO UTILIZANDO VOLTAMETRIA DE ONDA QUADRADA / DETERMINATION OF HERBICIDE PARAQUAT ON ELECTRODES OF PYROLYTIC GRAPHITE MODIFIED WITH COBALT PHTALOCYANINE USING WAVE SQUARE VOLTAMMETRY
Determination of paraquat (PQ) in watery solutions was investigated with the technique of wave square voltammetry on pyrolytic graphite electrodes (PG) before and after modifications with metal phtalocyanines. The electrode modified with cobalt phthalocyanine (CoPc) presented PQ reduction currents more accented and voltammetrics profiles better with respect
Publicado em: 2006
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12. Plasma characterization of pulsed-laser ablation process used for fullerene-like CNx thin film deposition
An in situ Optical Emission Spectroscopy (OES) characterization was performed on Pulsed-Laser Ablation (PLA) process used for fullerene-like CNx thin film deposition at nitrogen pressures within the 5 - 100 mTorr range. Plumes were generated by ablation of pyrolytic graphite (99.99%) target using a (500 mJ, 7 ns, 1064 nm) Nd: YAG-pulsed laser. The spectra fr
Brazilian Journal of Physics. Publicado em: 2004-12