Ionic Transport
Mostrando 1-12 de 182 artigos, teses e dissertações.
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1. Thermophysical and Transport Properties of the BaCl2-CsCl High Temperature Ionic Liquid Mixtures
High temperature ionic liquids (HTILs) densities and transport properties for mixtures BaCl2 CsCl, x(BaCl2) = 0-1, have been studied as a function of composition and temperature. In terms of Arrhenius theory, the temperature correlation of all measured properties was made and discussed. Thermodynamic properties (isothermal compressibility, molecular volume,
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Transport Properties of Binary Solutions Containing the Ionic Liquid BMI.BF4 and Ethylene Glycol
The ionic conductivity values of the ionic liquid (IL) 1-butyl-3-methylimidazolium tetrafluoroborate (BMI.BF4) and ethylene glycol (EG) electrolytes in different concentrations and over a wide temperature range were determined. The results are discussed in terms of the interactions between the cations and anions of the ionic liquid and the organic solvent. T
J. Braz. Chem. Soc.. Publicado em: 2015-10
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3. Optimization of Process Variables in the Synthesis of Isoamyl Isovalerate Using Sulfonated Organic Heteropolyacid Salts as Catalysts
Based on single factor experiments, a three level, four variable central composite designs were carried out to establish a quadratic regression model for the catalytic synthesis of isoamyl isovalerate over sulfonated organic heteropolyacid salts as a function of molar ratio of alcohol to acid, reaction time, the amount of water-carrying agent and the amount
J. Braz. Chem. Soc.. Publicado em: 2015-03
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4. Current developments of mixed conducting membranes on porous substrates
The fabrication of mixed ionic-electronic conducting (MIEC) ceramic-based membranes for oxygen separation has extensively increased in the last three decades as a promising alternative of clean energy delivery. In recent years, the interest on supported MIEC membranes has increased due to their attractive properties such as higher mechanical strength and oxy
Mat. Res.. Publicado em: 22/10/2013
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5. Estudo das propriedades elétricas de células eletroquímicas emissoras de luz de derivados de polifluoreno / Electric properties study of polymer light-emitting electrochemical cells based on polyfluorene derivatives
Polymer light emitting electrochemical cells, PLECs, are organic electronic devices that have attracted commercial interest because they operate at low voltage and exhibit high performance without the need of specific electrodes such as indium tin oxide (ITO), calcium and others. This feature provides low cost of fabrication and exible devices. The charge in
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/11/2011
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6. GENERALIZAÇÃO DO MODELO DE BARREIRAS DE ENERGIAS LIVRES ALEATÓRIAS PARA O ESTUDO DA CONDUTIVIDADE AC DE SISTEMAS SÓLIDOS DESORDENADOS / GENERALIZAÇÃO DO MODELO DE BARREIRAS DE ENERGIAS LIVRES ALEATÓRIAS PARA O ESTUDO DA CONDUTIVIDADE AC DE SISTEMAS SÓLIDOS DESORDENADOS
In this work it is proposed a generalized equation for universal behavior of the alternating conductivity, σ*(ω) = σ‟(ω) + iσ(ω), of disordered solid materials based on the Random Free Energy Barrier model deduced by J. C. Dyre in 1985. In this context, we tried to understand the conduction mechanisms and charge transport
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/11/2011
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7. Locally Perturbative Multiscale Methods for Ionic Solute Transport in Clayly Soils / Modelos Multi-escala Localmente Perturbativos para o Transporte de Solutos Iônicos em Meios Porosos Argilosos
Este trabalho objetiva o desenvolvimento de modelos computacionais capazes de construir simulações numéricas mais realistas e menos custosas computacionalmente para o problema de descontaminação de solos argilosos por técnicas de eletrocinética. Resultados inovadores são obtidos aprimorando-se os modelos multi-escala desenvolvidos anteriormente por L
Publicado em: 2010
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8. Propriedades eletrônicas e processos de transporte em materiais semicondutores nano-estruturados / Electronic properties and transport processes in nano-structured semiconductor materials
Os mecanismos de confinamento e transporte em escala nanométrica continuam a ser um desafio em Física do Estado Sólido, uma vez que tanto a dimensionalidade quanto o tamanho dos dispositivos continuam a ser reduzidos. Desta forma, o estudo e entendimento do transporte em materiais amorfos e nano-cristalinos, que apresentam acoplamento de processos de tran
Publicado em: 2010
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9. Estresse salino e mobilizaÃÃo de reservas cotiledonares durante a germinaÃÃo e estabelecimento da plÃntula de cajueiro anÃo-precoce / Salt stress and reserve mobilization in cotyledons during germination and seedling establishment of precocious-dwarf cashew
This study aimed to obtain basic information on seed germination and seedling establishment of dwarf-precocious cashew (Anacardium occidentale L.) under saline conditions and the relationship between salinity and reserve mobilization during these processes. BRS 189 seeds (cashew nuts) were sown in plastic trays containing vermiculite moistened with distilled
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2009
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10. Síntese e caracterização de NiO-CGO para anodo e eletrólitos sólidos e base de Céria para SOFC
The direct use of natural gas makes the Solid Oxide Fuel Cell (SOFC) potentially more competitive with the current energy conversions technologies. The Intermediate Temperature SOFC (IT-SOFC) offer several advantages over the High Temperature SOFC (HT-SOFC), which includes better thermal compatibility among components, fast start with lower energy consumptio
Publicado em: 2009
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11. Filmes automontados de óxidos metálicos: eletrocromismo e armazenamento de energia / Self-Assembled films composed of transition metal oxides for electrochromism and charge storage
Thin films of titanium dioxide (TiO2), poly(vinyl sulfonic acid) (PVS) and tungsten oxo-hydroxy (WOxHy) were prepared using the Layer-by-Layer (LbL) method, allowing for strict control of its thickness and nanoarchitecture. The properties of these films concerning lithium ion transport and storage were investigated, so that these materials can be applied in
Publicado em: 2009
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12. Simulação do crescimento de filmes sobre metais. O caso voltamétrico
In this work the anodic film growth on metals has been studied, under voltammetric conditions by simulation. It was supposed that: a) the films are ultrathin, i.e., the concentration gradient contributions for the ionic transport throughout the film are much lower than those of the electric field; b) the ionic transport throughout the film obeys an ohmic mod
Publicado em: 2008