3 documents found, page 1 of 1
Self-standing chitosan films as dielectrics in organic thin-film transistors
Morgado, J.; Pereira, A. T.; Braganca, A. M.; Ferreira, Q.; Fernandes, S. C. M.; Freire, C. S. R.; Silvestre, A. J. D.; Pascoal Neto, C.; Alcacer, L.Organic thin film transistors, using self-standing 50 gin thick chitosan films as dielectric, are fabricated using sublimed pentacene or two conjugated polymers deposited by spin coating as semiconductors. Field-effect inobilities are found to be similar to values obtained with other dielectrics and, in the case of pentacene, a value (0.13 cm(2)/(V.S) comparable to high performing transistors was determined. In...
Functionalized chitosan-based coatings for active corrosion protection
Carneiro, J.; Tedim, J.; Fernandes, S. C. M.; Freire, C. S. R.; Gandini, A.; Ferreira, M. G. S.; Zheludkevich, M. L.Chitosan-based coatings were suggested in this work as a \"green\" alternative for active corrosion protection of aluminum alloys. 2-Mercaptobenzothiazole (MBT) was used here as an efficient corrosion inhibitor for AA2024. The electrochemical impedance spectroscopy has demonstrated a strong inhibiting action of MBT showing no corrosion attack even after one week in full immersion tests when MBT-loaded chitosan ...
Chitosan-based self-healing protective coatings doped with cerium nitrate for c...
Carneiro, J.; Tedim, J.; Fernandes, S. C. M.; Freire, C. S. R.; Silvestre, A. J. D.; Gandini, A.; Ferreira, M. G. S.; Zheludkevich, M. L.The good film forming ability, specific solubility and versatile chemical functionalization of chitosan make it a promising candidate for "green" protective coatings. In the present work, these features are exploited together with chitosan high complexing ability to obtain inhibitor-containing anticorrosion coatings for active protection of aluminum alloys. The functionalization of chitosan with fluorinated sub...