Oxygen Impurities
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. Annealing Effects on the Structural and Optical Properties of ZnO Nanostructures
ZnO nanostructures were synthesized by a proteic sol-gel method, using zinc nitrate hexahydrate and gelatin as precursors. Size and shape evolution of ZnO nanostructures were achieved by annealing temperature in the range 250-1000 ºC. The crystalline structure, morphology and optical properties of the ZnO nanoparticles were characterized by X-Ray Diffractio
Mat. Res.. Publicado em: 05/03/2018
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2. Growth and Characterization of AlxGa1-xAs Obtained by Metallic-Arsenic-Based-MOCVD
In this work reports results related to growth and characterization of AlxGa1-xAs epilayers, which were grown in a metallic-arsenic-based-MOCVD system. The gallium and aluminium used precursors were trimethylgallium (TMGa) and trimethylaluminium (TMAl), respectively. By photoluminescence measurements observed, that only samples grown at temperatures above 80
Mat. Res.. Publicado em: 23/03/2017
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3. Plasma-spray synthesis and characterization of ti-based nitride and oxide nanogranules
The synthesis of nanosized Ti-based nanogranules via plasma spraying is reported. The synthesis route involved use of both nitrogen and oxygen gases with varying results. In the case of nitrogen, a mixture of titanium nitrides were produced, yielding both the Ti2N and the sub-stoichiometric TiN0.61 compounds. In the case of oxygen, both the stoichiometric ru
Mat. Res.. Publicado em: 15/08/2014
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4. Nanoestrutura de CdS: propriedades estruturais, eletrônicas e oxidação
CdS nanostructures form different shapes, with potential applications in solar cells, optical and mechanical devices. The presence of oxygen in nanostructures of these materials can be useful for obtaining new forms such as propellers, as well as for the construction of high performance devices as regards grinding. In this work, we made initially a comparati
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/08/2012
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5. Caracterização estrutural e eletrônica da zircônia pura e com defeitos e impurezas / Structural and electronic characterization of zirconia, pristine and with impurities
In this investigation we studied the electronic properties and the structural stabilities of zirconia (ZrO2), as well as oxygen vacancy and Ce substitutional impurity. The investigations were carried by computational simulations using ab initio methods, based on the density functional theory and the APW + lo (Aumengted Plane Waves plus local orbitals) method
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/12/2011
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6. ProduÃÃo de Ãcido CÃtrico utilizando glicerol residual da produÃÃo de biodiesel como substrato / Production of citric acid using residual glycerol from biodiesel production as a substrate
Due to government financial incentives, which boost the production of biodiesel, there has been a large scale production of this fuel. However, this growth has proved to be exaggerated, rising a worrying factor: the destination of the glycerol excess from biodiesel production. Such concern is clearly shown to prove an important fact: for every ton of biodies
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2011
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7. CaracteriazaÃÃo por difraÃÃo de raios-X e espectroscopia MÃssbauer de nanopartÃculas de SnO2 dopadas com ferro / Characterization by X-ray diffraction and MÃssbauer spectroscopy of SnO2 nanoparticles doped with iron
In this work structural characterization by x-ray diffraction and MÂossbauer spectroscopy of Fe-doped semiconducting oxide SnO2 nanoparticles is reported. The compound under study (Sn1−xFexOy) was prepared by high energy ball milling and proteic sol-gel. The samples prepared by ball milling showed an increase of Fe-doping in the semiconducting matrix
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/11/2010
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8. Condutividade elétrica da solução sólida céria-zircônia dopada com ítrio e gadolínio / Electrical conductivity of solid solution ceria-zirconia doped yttria and gadolinium
Rare earth doped ceria has a great potential to be used as electrolyte in temperatures around 800 C in fuel cells due to its higher electrical conductivity than YSZ. However, the reduction of Ce+4 to Ce+3 in low oxygen partial pressure has introduced limitations for using doped ceria electrolyte due to electronic conduction. Among the several ceria solid sol
Publicado em: 2009
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9. Production and characterization of indium oxide and indium nitride
Thin films of indium oxide 200 nm thick and indium nitride 150 nm thick were produced by reactive sputtering deposition onto soda lime substrates. The Indium cathode was kept under vacuum attached to a high voltage dc. The In xOy films were obtained in argon-oxygen mixture with total pressure between 2 and 7 Pa, current density between 0.04 and 0.56 mA/cm²
Brazilian Journal of Physics. Publicado em: 2006-09
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10. Oil and fat in broiler nutrition
The terms "fat" and "oil" refer to triglycerides of several profiles of fatty acids. Fatty acids that are not bound to other organic components as glycerol are the so-called free fatty acids. Lipids constitute the main energetic source for animals and they have the highest caloric value among all the nutrients. Linoleic acid is the only fatty acid whose diet
Revista Brasileira de Ciência Avícola. Publicado em: 2005-09
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11. Caracterização de escorias e recuperação do silicio / Characterization of slag and recovery of the silicon
Metallurgieal Grade Silicon (MGSi) is produced by a well-established industrial process that consists of the carbo-reduction of quartz in a submerged are fumace under high temperature. The process is an intensive energy consumption method (13 - 15 kWh to each kilogram of produced MGSi). After tapered, the MGSi is submitted to some purification stages in orde
Publicado em: 2003
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12. Poli(oxido de etileno-co-epicloridrina) : degradação foto-oxidativa e termica, e blenda com polipropileno
Polymers derived from ethylene oxide and epichlorohydrin, like poly(epichlorohydrin-co-ethylene oxide) elastomer, are studied as polymer electrolyte for application in photo-electrochemical devices. These materiaIs present the ability to form complexes with alkali salts, presenting high ionic conductivity. In these devices the conversion of the solar energy
Publicado em: 2003