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Mostrando 1-12 de 167 artigos, teses e dissertações.
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1. Preparation and characterization of yttria stabilized zirconia (YSZ) films deposited by dip-coating on LSM-YSZ substrate with different proportions
ABSTRACT In this work, sol-gel/dip-coating process for obtaining yttria stabilized zirconia (YSZ, ZrO2–8% Y2O3) films deposited onto LSM-YSZ (lanthanum strontium manganite (LSM, La0.7Sr0.3MnO3) mixed with YSZ) with different proportions (20/80, 50/50, 80/20) was investigated. The films were deposited on substrate varying the number of layers deposited. LSM
Matéria (Rio J.). Publicado em: 25/11/2019
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2. Removal of Orange G Dye by Manganese Oxide Nanostructures
Two types of manganese oxide were investigated for the removal/degradation of Orange G (OG) dye in aqueous solution. One manganese oxide (pyrolusite) was obtained commercially and the other (birnessite) was prepared according to the polyol method by means of the oxidation of MnII hydroxide by H2O2. Both materials were characterized by X-ray diffraction (XRD)
J. Braz. Chem. Soc.. Publicado em: 12/08/2019
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3. Characterization of Algerian kaolins for utilization as a raw material in electrical insulators
Resumo O objetivo desta investigação foi caracterizar três amostras de caulim (DD1, DD2 e DD3) coletadas do depósito de Djebel Debbagh (leste da Argélia) para serem utilizadas em isoladores elétricos de porcelana. Análise granulométrica, fluorescência de raios X, difração de raios X, microscopia eletrônica de varredura e análise térmica (TG-ATD
Cerâmica. Publicado em: 06/06/2019
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4. Baker’s yeast-MnO2 composites as biosorbent for Malachite green: An ecofriendly approach for dye removal from aqueous solution
Resumo Neste estudo, compósitos de MnO2-levedura de pão, produzidos pela oxidação direta da levedura com KMnO4 sob condições ácidas, foram usados como biossorvente para remover o corante trifenilmetano verde Malaquita (VM) de solução aquosa. Os parâmetros que influenciam o processo de adsorção tais como pH, tempo de contato, temperatura, concentr
Rev. Ambient. Água. Publicado em: 07/01/2019
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5. Electrocatalytic Oxidation Removal of Phenol from Aqueous Solution with Metal Oxides Doped Carbon Aerogel
Metal oxides (manganese oxide, MnO, manganese dioxide, MnO2, copper oxide, CuO, zinc oxide, ZnO and nickel oxide, NiO) doped carbon aerogel (CA) were prepared and used as catalysts in heterogeneous oxidation of phenol from aqueous solution in a three-dimensional (3D) electrode reactor. Textural characterization of metal oxides doped CA showed that the metal
J. Braz. Chem. Soc.. Publicado em: 2018-04
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6. PROCESSING OF SPENT ZINC-MnO2 DRY CELLS IN VARIOUS ACIDIC MEDIA
This paper describes a route for recovering manganese and zinc from spent zinc-MnO2 dry cells via acid leaching. Sulfuric, hydrofluoric and formic acids were used as leachants. Hydrogen peroxide was added as reductant, except for formic acid since it is itself a reductant. Experiments were run at 25-40 ºC for 1-3 h. Under the best optimal conditions, over 9
Quím. Nova. Publicado em: 2018-02
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7. Influence of Pellet Compaction Pressure on the Physical Properties of La0.7Ba0.3MnO3 Manganite
Perovskite manganite La0.7Ba0.3MnO3, synthesized by ionic coordination reaction method (ICR) was compacted into pellets under different compaction pressures (Pc) and sintered at a temperature of 1150°C for 10h under a flow of O2. X-ray diffraction (XRD) data reveal that the samples can present simultaneously two phases - a rhombohedral structure with space
Mat. Res.. Publicado em: 11/12/2017
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8. Effect of La 0.8 Sr 0.2 MnO 3 powder addition in the precursor solution on the properties of cathode films deposited by spray pyrolysis
ABSTRACT Films of lanthanum strontium manganite, LSM (La0.8Sr0.2MnO3) were deposited on yttria stabilized zirconia (YSZ) substrates by different methods aiming to establish the most suitable route to prepare cathodes for solid oxide fuel cells (SOFC). Samples were obtained by using a solution of lanthanum, strontium and manganese nitrates or a dispersion of
Matéria (Rio J.). Publicado em: 11/05/2017
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9. Structural, Atomic and Electrostatic Force Microscopy Analyses on YBCO/PBCO/LCMO Superlattices
In order to study the influence of the insulator layer thickness in heterojunctions, (YBa2Cu3O7-δ[20nm]/ PrBa2Cu3Oy/La1/3Ca2/3MnO3[20nm])x20 superlattices were prepared by pulsed laser deposition using three PrBa2Cu3Oy layer thicknesses and two different sequences of deposition. Sample characterization showed primitive orthorhombic crystalline arrangement f
Mat. Res.. Publicado em: 03/04/2017
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10. Chemical-Mineralogical Characterization of Magnetic Materials from Magnetic Soils of the Southern Espinhaço Mountain Chain and of the Upper Jequitinhonha Valley, State of Minas Gerais, Brazil
ABSTRACT In the Southern Espinhaço Mountain Chain and in the Upper Jequitinhonha Valley, magnetic soils, in different pedogenetic stages, are found to be forming over intrusions of basic lithology. The essential chemical and mineralogical properties of samples from magnetic soil profiles from those two physiographic environments in the state of Minas Gerais
Rev. Bras. Ciênc. Solo. Publicado em: 27/03/2017
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11. A Comparative Study on Ag-Doped and Surfactant Assisted MnO2 Prepared by Direct and Pulse Current Electrodeposition on Surgical Grade Stainless Steel as High-Performance Supercapacitor
Direct and pulse current electrodeposition techniques were applied for preparation of novel electro-active manganese oxides. The influences of Ag doping and addition of cetyltrimethylammonium bromide (CTAB) on electrochemical properties were discussed. The morphology and structure of the electrodes are studied by different techniques including field emission
J. Braz. Chem. Soc.. Publicado em: 2017-01
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12. Investigating the Provenance of Iron Artifacts of the Royal Iron Factory of São João de Ipanema by Hierarchical Cluster Analysis of EDS Microanalyses of Slag Inclusions
Microstructural characterization techniques, including EDX (Energy Dispersive X-ray Analysis) microanalyses, were used to investigate the slag inclusions in the microstructure of ferrous artifacts of the Royal Iron Factory of São João de Ipanema (first steel plant of Brazil, XIX century), the D. Pedro II Bridge (located in Bahia, assembled in XIX century a
Mat. Res.. Publicado em: 24/11/2016