Bulk Deposition
Mostrando 13-24 de 41 artigos, teses e dissertações.
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13. Corrosão anisotropica e formação de superficie nanoestruturada de Si utilizando plasma de alta densidade / Si anisotropic etching and nanostructured surface formation using high density plasma
This work explores the implementation, characterization and applications of BOSCH type process for bulk silicon etching (or bulk silicon micromachining) using inductively coupled high density plasma (ICP). This etching process is characterized by its high anisotropy and is performed by alternating etching steps, employing SF6 + Ar gas mixture, and passivatio
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/07/2009
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14. Concentrações de amônio na água da chuva e estimativa de emissão de amônia de rebanhos domésticos de Pinheiro e Viana, Baixada Maranhense
Rainwater samples (bulk deposition samples) were collected in Pinheiro and Viana. Rainwater pHs were higher than the range usually expected for unpolluted rain (5.0-5.6). The highest values were found in the beginning of the rainy season. High concentrations of ammonium found in the rainwater samples could probably explain the high pHs. Grazing animals and o
Química Nova. Publicado em: 2009
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15. Development of a aggregation source for metallic nano-clusters / Desenvolvimento de uma fonte de nano-agregados metalicos
Nanosystems are one of the most important fields of research in the current days, mainly motivated by their technological potential. This size regime present new and unexpected properties that strongly differ from their macroscopic counter-part. This happen mainly due to effects arising from their high surface-to-bulk ratio and because their sizes are compar
Publicado em: 2009
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16. DLC with silver nanoparticles study for space and biomedical applications / Estudo de crescimentos de filmes de DLC com nanopartículas de prata para aplicações espaciais e biomédicas
Diamond-like carbon (DLC) is a metastable form of amorphous carbon with high mechanical hardness, chemical inertness, optical transparency, low friction coefficient and its wear resistant. Since centuries, silver is known as bactericidal agent and, as a soft metal, its also used as a solid lubricant. This project develops a deposition process to insert silve
Publicado em: 2008
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17. Estudos voltamétricos e microgravimétricos da deposição em subtensão de cádmio e chumbo sobre filmes finos de selênio / Voltammetric and microgravimetric studies of underpotential deposition of cadmium and lead on selenium thin films
Cd and Pb underpotential deposition (UPD) on gold electrode and selenium thin film, from acid media, were studied using cyclic voltammetry (CV) and electrochemical quartz crystal microbalance (EQCM). Different form of deposition for cadmium and lead were observed on gold electrode and selenium thin film. The presence of one peak in the positive sweep with a
Publicado em: 2008
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18. Crescimento de filmes nanométricos monocristalinos de Fe/MgO(100) por "SPUTTERING" DC
The research behind this master dissertation started with the installation of a DC sputtering system, from its first stage, the adaptation of a refrigerating system, passing by the introduction of a heating system for the chamber using a thermal belt, until the deposition of a series of Fe/MgO(100) single crystal nanometric film samples. The depo
Publicado em: 2007
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19. Produção de sedimentos em áreas urbanas: o caso da Microbacia do Córrego do Pau DAlho. Guarulhos, SP
This work presents the research results about sediment yield related to actual land use in Pau dAlho watershed, about 0, 51 km2, located at Cabuçu region, Guarulhos, SP. The research was conducted by an Engineering Geology approach encompassing technogenic sediment deposits survey, the environment characterization and the history of land use that originated
Publicado em: 2007
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20. Surface treatments of a iron aloy by nitrogen ions / Tratamentos de superficies de uma liga ferrosa por ions de nitrogenio
The objective of this project is to study processes of plasma surface treatment with special emphasis to the differences these techniques might show in relation to others, looking forward to understand the process from surface phenomena. Two kinds of surface treatment have been studied, including three different techniques: ion beam nitriding, pulsed plasma
Publicado em: 2006
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21. Obtenção e caracterização de filmes finos de oxido, nitreto e oxinitreto de silicio por deposição ECR-CVD / Synthesis and characterization of oxide nitride and silicon oxynitride thin films by ECR-CVD
In this work, silicon nitride (SixNy), oxide (SiOx) and oxynitride (SiOxNy) thin films obtained by remote plasma chemical vapor deposition (RPCVD) on silicon substrate were studied and characterized for micromachining or micro electro-mechanical system (MEMS) applications. Silicon nitride films (SixNy) were used in suspended structures (membranes and bridges
Publicado em: 2005
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22. Durabilidade de argamassas modificadas por polimeros e reforçadas com fibras vegetais / Durability of fiber-cement polimer modify
Several researches on vegetal-fiber-cement composites have been developed aiming to solve problems related to the banishment of asbestos and environmental damages due to deposition or burnirng of agro-industry residues. The durability of the cellulose-cement composites is a key factor to introduce such material in the market. Several researches have been dev
Publicado em: 2004
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23. Estudos microgravimétricos da deposição de cobre sobre eletrodos de cromo passivado.
Recently were obtained in our laboratory results indicating that Cu deposition on Cr2O3 happens in two steps: at the first one, there is the deposition of an amount smaller than one Cu monolayer, and at the second one there is Cu bulk deposition. Evidences show that the first step mechanism is UPD like, although it is necessary a deeper investigation. In thi
Publicado em: 2002
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24. Mercury Concentrations in Bulk Atmospheric Deposition over the Coast of Rio de Janeiro, Southeast, Brazil
As concentrações totais de Hg foram medidas em amostras de deposição atmosférica total coletadas em três regiões costeiras do Estado do Rio de Janeiro, sudeste do Brasil entre Outubro de 1998 e Dezembro de 1999. Amostras foram coletadas em Campos dos Goytacazes, área agrícola no norte do estado, em Niterói, região urbanizada e industrializada, e e
Journal of the Brazilian Chemical Society. Publicado em: 2002