Voltammetry Techniques
Mostrando 1-12 de 70 artigos, teses e dissertações.
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1. A Calix[4]arene-Functionalized Perylene Imide and Its Luminescence Properties
In this study, new perylene-derived molecules were synthesized as perylene-3,4,9,10-tetracarboxylic acid monoanhydride monopotassium carboxylate 1; N-(3-propanol)perylene-3,4,9,10-tetracarboxylic-3,4-(monoimide)anhydride-9,10-acid potassium carboxylate 2; 5,11,17,23-tetra(tert-butyl)-25,27-bis(3’-bromopropoxy)-26,28-(dihydroxy)calix[4]arene 3; 5,11,17,23-t
J. Braz. Chem. Soc.. Publicado em: 2020-11
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2. AVALIAÇÃO DE NANOTUBOS DE CARBONO FUNCIONALIZADOS VISANDO O DESENVOLVIMENTO DE MÉTODOS DE PRÉ-CONCENTRAÇÃO DE ÍONS METÁLICOS E DETERMINAÇÃO POR TÉCNICAS ESPECTROMÉTRICAS E ELETROANALÍTICAS
This review focuses on the use of functionalized carbon nanotubes (CNTs) on the development of preconcentration methods with substantial contributions on selectivity and sensitivity for metal ions determination. CNTs have been usually employed in the development of preconcentration/speciation coupled to spectroanalytical techniques for ions determination at
Quím. Nova. Publicado em: 2020-09
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3. SÍNTESE E CARACTERIZAÇÃO DE NITROSIL COMPLEXOS COM AÇÃO ANTIBACTERIANA FRENTE A Pseudomonas aeruginosa
The compounds nitrosyl cis-[Ru(bpy)(phen)TU(NO)](PF6)3 (compound 1) and cis-[Ru(bpy)(phen)(4-N-Imd)(NO)](PF6)3 (compound 2) (bpy = 2,2’-bipyridine, phen = 1,10’-phenanthroline, TU = thiourea and 4-N-Imd = 4-nitroimidazole) were synthesized and characterized by UV-visible, infrared spectroscopies and electrochemical techniques. In the study of the reactiv
Quím. Nova. Publicado em: 2020-02
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4. Nanoparticles of Fe2O3 and Co3O4 as Efficient Electrocatalysts for Oxygen Reduction Reaction in Acid Medium
This paper presents a comparative study about the oxygen reduction reaction (ORR) catalyzed by nanoparticles of Fe2O3 and Co3O4 applied on the surface of glassy carbon electrodes (GCE). The nanoparticles were synthesized using the modified polymeric precursor method (Pechini). These two nanomaterials were characterized by Fourier transform infrared spectrosc
J. Braz. Chem. Soc.. Publicado em: 24/10/2019
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5. Glycerol Effect on the Corrosion Resistance and Electrodeposition Conditions in a Zinc Electroplating Process
Zinc electrodeposition is an economical process of Zn coating compared to conventional galvanic process. The galvanizing process is used in various industrial sectors to protect ferrous alloys during the corrosion process. In buildings, the galvanizing process is widely used to coat mortar protective screens. The electrodeposition of zinc has a relatively lo
Mat. Res.. Publicado em: 19/08/2019
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6. Development and Characterization of PbI2 Nanoparticles for all Solid-State Flexible Supercapacitor Purposes
The development and utilization of new energy sources has been extensively studied in the world. Here, we report the development of flexible self-supported metal-free electrodes based on non-oxidized graphene multilayer (MLG) paper containing the lead iodide nanoparticles (PbI2-NPs). The PbI2-NPs was obtained and characterized by X-ray diffraction (XDR) and
Mat. Res.. Publicado em: 20/05/2019
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7. Recombination Study of Dye Sensitized Solar Cells with Natural Extracts
Natural dyes can be used in dye sensitized solar cells (DSSCs) to generate low-cost devices, although with low light harvesting because of energy losses from the recombination process. This study investigates recombination reactions in DSSCs with natural dyes extracted from eggplants, plums, and hibiscus flowers. Titanium dioxide films were coated on a fluor
J. Braz. Chem. Soc.. Publicado em: 2019-02
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8. Determinación del área de superficie real de electrodos de titanio modificado con platino por voltamperometría cíclica
ABSTRACT The surface area of Ti/TiO2-Pt electrodes (ASr) in contact with 0.010 M HClO4 solutions was determined by Cyclic Voltammetry (CV) and Atomic Force Microscopy (AFM) techniques. The Ti/Pt/TiO2 electrodes with different amounts of electrodeposited Pt (1, 5 and 10 seconds) were polarized up to 1.5 V vs. Ag/AgCl (sat. KCl) and stabilized at the final pot
Matéria (Rio J.). Publicado em: 19/07/2018
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9. Antioxidant activity evaluation of dried herbal extracts: an electroanalytical approach
ABSTRACT The prevention of chronic and degenerative diseases, is a health concern deeply associated with oxidative stress. Such progressive phenomena can be avoided through exogenous antioxidant intake, which set up a reductant cascade, mopping up damaging free radicals. Medicinal herbs are commonly associated with high antioxidant potential, and hence their
Rev. bras. farmacogn.. Publicado em: 2018-06
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10. Development of a Novel and Simple Electroanalytical Procedure for the Determination of Copper in Biofuel Employing a Sensor Based on Vulcan Functionalized with Carbazone
A novel and simple electroanalytical method for the determination of Cu2+ in biodiesel samples by stripping voltammetric analysis was developed. The method employs a carbon paste electrode (CPE) modified with Vulcan carbon, previouly functionalized with carbazone (CBZ). The CPE/Vulcan-CBZ sensor promoted a significant increase in the analytical signal obtain
J. Braz. Chem. Soc.. Publicado em: 2018-04
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11. The Effect of Electrolyte pH on the Ni-Co Mixed Oxides Coatings Produced from Citrate Baths
In this work, Ni-Co oxides coatings were produced using electrochemical techniques (chronopotentiometry and/or linear voltammetry) and solutions containing Ni2+ and Co2+ ions in the molar ratio 1: 2, sodium citrate as the ligand, and different pH values (7.5 and 10.5). Energy dispersive spectrometry (EDS), scanning electron microscopy (SEM), Raman spectrosco
Mat. Res.. Publicado em: 11/01/2018
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12. Characterization and Evaluation of Silver-Nanoparticle-Incorporated in Composite Graphite Aiming at their Application in Biosensors
Abstract Biosensors based on nanomaterial composites have been investigated for their potential to function as high sensitivity signal response devices. In the present study, we report the fabrication of silver nanoparticles (AgNPs) on a graphite epoxy composite electrode (GEC) and mixed with the polyaniline (a conductive emeraldine salt form polymer) compos
Braz. J. Chem. Eng.. Publicado em: 2017-07