Electrolyte Cell
Mostrando 13-24 de 136 artigos, teses e dissertações.
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13. Preparation and Characterization of an Eco-Friendly Polymer Electrolyte Membrane (PEM) Based in a Blend of Sulphonated Poly(Vinyl Alcohol)/ Chitosan Mechanically Stabilised by Nylon 6,6
Abstract Membranes for fuel cell applications were prepared using two polymer blends: poly(vinyl alcohol) (PVAL) and chitosan (CS), 80/20 (w/w) and 60/40 (w/w) with and without nylon. Sulfosuccinic acid (SSA) was used both as a crosslinking and a sulfonating agent. An increasing in the SSA content raised ionic exchange capacity and consequently proton conduc
Mat. Res.. Publicado em: 21/07/2016
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14. CÉLULAS SOLARES SENSIBILIZADAS POR CORANTES NATURAIS: UM EXPERIMENTO INTRODUTÓRIO SOBRE ENERGIA RENOVÁVEL PARA ALUNOS DE GRADUAÇÃO
An interesting practical experiment about the preparation of dye–sensitized solar cells (DSSC) using natural dyes were carried out by the undergraduate students in the chemistry course at UNICAMP . Natural dyes were extracted from blueberries (Vaccinium myrtillus L.), jabuticabas (Myrciaria cauliflora), raw and cooked beets (Beta vulgaris L.), and annattos
Quím. Nova. Publicado em: 2015-12
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15. Velocidad de corrosión de una aleación base plomo en una solución de ácido sulfúrico a diferentes temperaturas
Car batteries are not only affected by their use and wear but also by other factors such as electrolyte concentration, water loss and temperature that can be exposed, the latter being the most influential factor causing an increase in the corrosion rate of lead alloys (battery components), and affecting their service time. Therefore, for the industry of auto
Matéria (Rio J.). Publicado em: 2014-06
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16. Performance of a direct glycerol fuel cell using KOH doped polybenzimidazole as electrolyte
Este trabalho mostra os resultados correspondentes ao estudo da influência das variáveis de operação (temperatura, concentração de glicerol, de KOH e vazão de alimentação) de uma célula a combustível de glicerol direto usando o polibenzimidazol (PBI) impregnado com KOH como eletrólito e Pt/C como catalisador. A temperatura mostra um efeito favor�
J. Braz. Chem. Soc.. Publicado em: 2014-03
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17. Growth and electrochemical stability of self-organized TiO2nanotubes on Ti-2 grade and orthopedic Ti6Al4V alloy for biomedical application
Titanium and its alloys are biomaterials used in endosseous implants, due to desirable mechanical properties, high corrosion resistance and biocompatibility. Using electrochemical anodization technique these materials can be recovered with self-organized TiO2 nanotubes layer resulting in increased specific surface area and probable bioactivity improvement.
Matéria (Rio J.). Publicado em: 2014-03
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18. Synthesis and characterization of sulfonated poly(ether imide) with higher thermal stability and effect on CO2, N2, and O2 permeabilities
An experimental design in different reaction conditions was applied to modify poly(ether imide), PEI, by sulfonation using acetyl sulfate. Higher temperatures and reaction times led to higher ion exchange capacity. The thermal analysis showed that our sulfonation approach accomplished preparing sulfonated PEI maintaining the thermal stability of its parent m
Mat. Res.. Publicado em: 18/02/2014
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19. Low and medium temperature fuel cells: experimental tests and economic assessment / Low and medium temperature fuel cells: experimental tests and economic assessment
This Masters dissertation aims to study technical potentialities of Fuel Cell technology, including the economical benefits that can provide compared with public grid as well. Thus, the dissertation has been focused in two main parts: the first concerns in an experimental approach to supply electrical power to the public grid using a Polymer Electrolyte Memb
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/12/2012
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20. Platinum and nioubium based catalysts for the anode of polymer electrolyte membrane fuel cells fed with low molecular weight alcohols / Catalisadores a base de platina e nióbio para o ânodo da célula a combustível de membrana trocadora de prótons alimentada com alcoóis de baixa massa molecular
In this work, the methanol and ethanol electrochemical oxidation reactions are studied on platinum (Pt) and niobium (Nb) catalysts supported on high surface area carbon. The selected materials were PtNb/C, Pt-Nb2O5(amorphous) /C e Pt-Nb2O5(crystalline) /C, using as reference for comparison purposes the commercial catalyst 20% Pt-C E-TEK. The catalysts were p
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/01/2012
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21. Aplicação do corante da casca da berinjela em células solares fotossensibilizadas. / Application of dye from the peel of eggplant in photosensitizer in solar cells.
Despite the efficiency of conventional solar cells reach about 20%, the cost of producing electricity using photovoltaic panels about 42 cents per kWh is still much higher than the cost of power generated by hydroelectric, 8 cents per kWh. Given the high cost of producing solar panels, woke up the interest in solar cells using dyes fotoexcitáveis known as G
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2011
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22. Development of analyrtical methods for determination of N-nitrosamines in shampoo samples by liquid chromatography coupled to diode array, electrochemical and mass spectrometry detecto / Desenvolvimento de métodos para determinação de N-nitrosaminas em amostras de xampu por cromatografia líquida acoplada à detecção por arranjo de diodos, eletroquímica e espectrometria de massas
N-nitrosamines (NA) are N-nitroso compounds, showed to be carcinogenic in a wide variety of experimental animals. In addition, they also present mutagenic and teratogenic activities. N-nitrosamines have been found during the last three decades in a variety of consumer products, including cosmetic and personal care products, and their raw materials. The most
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/02/2011
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23. Construção de uma célula-autoclave para medidas eletroquímicas a altas temperaturas
Measurements at high temperature using liquid solutions require special cells and materials which are able to support the temperature and pressure developed inside. The constructed cell was designed to support pressures up to 20 bar, temperatures relatively high up to around 200 ºC, depending on the pressure developed inside the system. It also supports agg
Química Nova. Publicado em: 2011-09
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24. Desenvolvimento de dispositivos eletroquímicos descartáveis para análises rápidas / Development of disposable electrochemical devices for rapid analysis
This paper presents the efforts to the construction and characterization of electrochemical transducers on polyester and paper, and also demonstrates the use of these disposable electrochemical cells in the development of a biosensor for rapid analysis of salicylate in blood as well as the creation of a separation device associated electrochemical detection
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/08/2010