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Now showing items 11-20 of 68
Preparação dos eletrodos óxidos cerâmicos para aplicação em filmes finos do tipo Pb1-xCaxTiO3
(Universidade Federal de São Carlos, 2008-01-25)
In this work the compounds LaNiO3 (LNO) and La0,5Sr0,5CoO3-δ (LSCO) were synthesized for application as oxide electrodes in thin films and the compound Pb1-xCaxTiO3 (PCT10) was synthesized as a material with a ...
Caracterização microestrutural, morfológica e óptica de filmes anódicos de ZrO2
(Universidade Federal de São Carlos, 2007-12-17)
In this work, we described some of the anodic ZrO2 properties such as microstructure, morphology and luminescence. The microstructural analysis during the breakdown process reveals that the oxide nature is similar to those ...
Titanatos de alcalinos terrosos : a ordem associada à desordem
(Universidade Federal de São Carlos, 2010-02-26)
The microwave-assisted hydrothermal method was implemented in the synthesis of alkaline earth titanates under ABO3 stoichiometric known as perovskites, being efficient and innovative. For that, OH- groups played an important ...
Avaliação e caracterização da borracha natural de diferentes clones de seringueira cultivados nos estados de Mato Grosso e Bahia
(Universidade Federal de São Carlos, 2010-03-02)
Natural rubber (NR) is a basic raw material used in the manufacture of a wide range of rubber goods. Usually both quality and productivity levels of Brazilian NR are lower than the imported NR. This is due to a lack of ...
Eletrossíntese, caracterização e testes de compósitos de polipirrol e poli(DMcT) sobre fibra de carbono como catodos de baterias secundárias e eletrodos de supercapacitores
(Universidade Federal de São Carlos, 2009-11-27)
In this work bilayered electrodes made of polypyrrole Ppy and poly(2,5-dimercapto-1,3,4-tiadiazol) poly(DMcT) were produced and characterized on carbon-fiber substrate. To do so, several aspects were investigated: ...
Estudo da corrosão do aço ao carbono em meio de sulfeto
(Universidade Federal de São Carlos, 2009-09-08)
This work presents a study of the 1020 and 1040 carbon steel corrosion in aqueous solution containing dissolved H2S in order to investigate the effect of H2Saq and HSaq species. Some different electrolytes were used: acetic ...
Estudo da corrosão de aço AISI 1020 em meio de petróleo
(Universidade Federal de São Carlos, 2011-08-11)
The chemical attack on crude oil, which contains corrosive compounds such as H2S, CO2, naphthenic acids and salts dissolved in the aqueous phase, combined with effects of varying pH, temperature, flow and pressure, has ...
Novas rotas para a síntese hidrotérmica de nanoestruturas de óxidos de titânio
(Universidade Federal de São Carlos, 2012-02-28)
The development of new materials has been a major focus of modern science. In order to obtain materials with desired features, studies about synthesis are necessary for a better understanding of their synthetic processes. ...
Transporte de vapor de água e sorção de CO2 em filmes de polisulfona: efeito das variáveis de processamento e envelhecimento físico.
(Universidade Federal de São Carlos, 2004-08-31)
Water vapor transport properties and CO2 sorption were studied for bisphenol A Polysulfone films, PSF, prepared with different thickness via solvent casting and a compression molding. From the measurements of water vapor ...
Propriedades fotoluminescentes do CuMoO4
(Universidade Federal de São Carlos, 2011-12-19)
In this study, CuMoO4 were synthesized, characterized and crystallized into powders in two structures: monoclinic and triclinic. CuMoO4 powder were synthesized by precipitation, and the reaction s pH were controlled due ...