Search

Your search keyword '"J.I. Martins"' showing total 3 results
Start Over Author "J.I. Martins" Journal materials science forum
3 results on '"J.I. Martins"'

1. Effect of Oxidant/ Monomer Ratio on the Electrical Properties of Polypyrrole in Tantalum Capacitors

Author

Gonçalo Gonçalves, Rodrigo Martins, Elvira Fortunato, and J.I. Martins

Subjects
Tantalum capacitor, Work (thermodynamics), Materials science, Mechanical Engineering, Condensed Matter Physics, Polypyrrole, Cathode, law.invention, chemistry.chemical_compound, Monomer, Chemical engineering, chemistry, Mechanics of Materials, Electrical resistivity and conductivity, law, Organic chemistry, General Materials Science, Layer (electronics)
Abstract

In this work, the relation between oxidant/monomer ratio and the electrical conductivity of polypyrrole was studied using different ratios. We achieved a maximum value for electrical conductivity of 7.5 S/cm for a ratio of 2:1. We also developed a chemical dip-coating process to produce the cathode layer in tantalum capacitors. We obtained capacitances of about 80 µF after 8 cycles using the sequence Monomer/Oxidant.

Published
2006
Full Text
View/download PDF

2. The Influence of Reducing Agents in the Performance of the Proton Exchange Membrane Fuel Cell

Author

Moisés L. Pinto, Mohammed Bazzaoui, M.C. Nunes, J.I. Martins, and Luísa M. D. R. S. Martins

Subjects
Materials science, Ethanol, Reducing agent, Mechanical Engineering, Inorganic chemistry, Hydrazine, Proton exchange membrane fuel cell, Condensed Matter Physics, Direct-ethanol fuel cell, chemistry.chemical_compound, Ethanolamine, chemistry, Mechanics of Materials, General Materials Science
Published
2004
Full Text
View/download PDF

3. Electrochemical Synthesis of Polythiophene Coatings on Zinc and a Zinc Alloy in Organic Media

Author

El Arbi Bazzaoui, Luísa M. D. R. S. Martins, J.I. Martins, and Mohammed Bazzaoui

Subjects
Materials science, Mechanical Engineering, Inorganic chemistry, Alloy, chemistry.chemical_element, Zinc, engineering.material, Condensed Matter Physics, Electrochemistry, Organic media, chemistry.chemical_compound, chemistry, Mechanics of Materials, Thiophene, engineering, Polythiophene, General Materials Science
Published
2004
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results