Nafion
Mostrando 1-12 de 74 artigos, teses e dissertações.
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1. Nafion/sulfonated poly(indene) polyelectrolyte membranes for fuel cell application
Abstract Sulfonated poly(indene) (SPInd), with 35% and 45% degree of sulfonation, was blended with Nafion to prepare blended membranes with 10, 15 and 20 wt.% of SPInd. Membranes were evaluated by infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, scanning electron microscopy and X-ray diffraction. Water uptake (WU), ion ex
Polímeros. Publicado em: 10/07/2018
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2. CO Tolerance and Stability of Proton Exchange Membrane Fuel Cells with Nafion® and Aquivion® Membranes and Mo-Based Anode Electrocatalysts
This work presents a CO tolerance study of PtMo/C (70:30, Pt:Mo) and Pt/MoO2-C anode catalysts on proton exchange membrane fuel cells (PEMFC) with Nafion® and Aquivion® ionomer membranes. Results denote improved activity for the hydrogen oxidation reaction (HOR) in the presence of CO on both anode catalysts at 85 ºC. Experiments of identical location tran
J. Braz. Chem. Soc.. Publicado em: 2018-05
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3. Electroremediation of deactivated catalysts from fluidised catalytic cracking for vanadium removal - the effect of a dual cathode chamber reactor
Abstract The aim of this study was to evaluate the quantity of vanadium removed through electrokinetic remediation applied to catalyst waste used in a fluid catalytic cracking process. In excess, vanadium affects process efficiency by reducing the catalyst’s activity, causing deactivation and reducing its useful life in petroleum cracking during refining.
Braz. J. Chem. Eng.. Publicado em: 2018-01
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4. Proton Exchange Membrane Based on Sulfonated Poly (Aromatic Imide-Co-Aliphatic Imide) for Direct Methanol Fuel Cell
A new sulfonated poly(aromatic imide-co-aliphatic imide) (SPI) for the use as a polymer electrolyte membrane was successfully synthesized from 4,4'-diaminodiphenylmethane (DDM), 4,4'-diaminodiphenylmethane-2,2'-disulfonic acid disodium salt (S-DDM), hexamethylenediamine, and 3,3',4,4'-benzophenonetetracarboxylic dianhydride in a one-step reaction. S-DDM was
Mat. Res.. Publicado em: 18/12/2017
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5. Electrochemiluminescence Sensor for the Detection of Tiapride Hydrochloride with Chitosan-Ru(bpy)32+-SiO2NPs/MCNT/Nafion Modified Electrode
Chitosan-Ru2(bpy)32+-SiO2 composite nanoparticles (CRuS NPs) were prepared by reverse microemulsion method for the electronic attraction between negative charge of hydroxyl groups in chitosan and positive charge in Ru2(bpy)3 2+. Based on the multi-walled carbon nanotubes (MCNT)/Nafion composite membrane technology, CRuS NPs was effectively and steadily immob
J. Braz. Chem. Soc.. Publicado em: 2017-02
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6. Novel Non Enzymatic TBHQ Modified Electrochemical Sensor for Hydrogen Peroxide Determination in Different Beverage Samples
A nanosensor was developed for hydrogen peroxide determination based on nafion/graphene oxide/silver nanoparticles/tertiary butylhydroquinone (TBHQ) modified glassy carbon electrode (N-GO/AgNPs/TBHQ/GCE). Cyclic voltammetry was used to investigate the electrochemical behavior of this modified electrode and differential pulse voltammetry was used for the redu
J. Braz. Chem. Soc.. Publicado em: 2016-09
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7. 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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8. Study of the Influence of the Hydration Level on the Electromechanical Behavior of Nafion Based Ionomeric Polymer-metal Composites Actuators
The ionomeric electroactive polymers-metal composites (IPMC) are materials that realize bending movements in response to an electrical stimulus and can be applied to the artificial muscles development. This paper investigated the influence of the hydration level on the electromechanical behavior of Nafion based IPMC. An experimental apparatus composed by a s
Mat. Res.. Publicado em: 24/11/2015
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9. A simple and sensitive method for determination of Norfloxacin in pharmaceutical preparations
Propos-se, por essa abordagem, novo método voltamétrico, com alta sensibilidade e faixa linear de detecção mais ampla, para a determinação de norfloxacino. O sensor voltamétrico utilizado foi fabricado simplismente por cobertura de camada de óxido de grafeno (GO) e filme de Nafion em eletrodo de cabrono vítreo. A vantagem do método proposto foi
Braz. J. Pharm. Sci.. Publicado em: 2015-06
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10. Nanostructured Polyelectrolytes Based on SPEEK/TiO2 for Direct Ethanol Fuel Cells (DEFCs)
Proton-conducting hybrid membranes consisting of poly(ether ether ketone) sulfonated (SPEEK) and titanium oxide (TiO2) were prepared using the sol-gel technique for application in direct ethanol fuel cells. The effect from TiO2 incorporation on membrane properties such as ethanol uptake, pervaporation and proton conductivity was investigated. The uptake and
Polímeros. Publicado em: 10/06/2014
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11. Preparação e uso de polímeros sólidos como eletrólito em sensores de hidrogênio
A detecção de hidrogênio permeado através de estruturas metálicas é tema de grande relevância, tendo em vista monitorar e controlar os danos que o hidrogênio causa nos metais, em especial o aço. Existem diversas tecnologias aplicadas à montagem destes sensores como, por exemplo, os sensores eletroquímicos. Muito usados em pilhas a combustível, me
Matéria (Rio J.). Publicado em: 2013-12
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12. Preparação e caracterização de bioanodos para biocélula a combustível etanol/O2 / Preparation and characterization of bioanodes for ethanol/O2 biofuel cell
Este trabalho descreve a preparação e caracterização de bioanodos para biocélula a combustível etanol/O2 utilizando enzimas desidrogenases, tanto com transferência eletrônica mediada como com transferência eletrônica direta. Na primeira etapa do trabalho, os resultados de cinética enzimática com as enzimas comerciais álcool desidrogenase e alde�
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/09/2012