The electrodeposition of polypyrrole on Al alloy from room temperature ionic liquids / Jun Nie in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 3 (09/2008)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 5, N° 3 (09/2008) . - p. 327-334 Titre : The electrodeposition of polypyrrole on Al alloy from room temperature ionic liquids Type de document : texte imprimé Auteurs : Jun Nie, Auteur ; Gordon P. Bierwagen, Auteur ; Dennis E. Tallman, Auteur Année de publication : 2008 Article en page(s) : p. 327-334 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages Dépôt électrolytique Liquides ioniques Polypyrroles Index. décimale : 667.9 Revêtements et enduits Résumé : The direct electrodeposition of conjugated polymers onto active metals such as aluminum and its alloys is complicated by the concomitant oxidation of the metal that occurs at the positive potential required for polymer formation/deposition. We previously described an approach that uses electron transfer mediation to reduce the deposition potential of polypyrrole (PPy) on aluminum and aluminum alloy by nearly 500 mV, permitting film deposition from aqueous solution with nearly 100% current efficiency. In this report, 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (EMIM+TFSI-) has been successfully employed both as the growth medium and the supporting electrolyte for directly depositing uniform and conductive PPy coatings onto Al alloy 2024-T3 surface via a potentiodynamic technique. The depositions of PPy were carried out under cyclic voltammetric conditions from 0.3 M pyrrole in ionic liquid solutions. Film morphology was characterized by atomic force microscopy, optical microscopy, and scanning electron microscopy (SEM). Energy dispersive X-ray analysis and X-ray photoelectron spectroscopy verified that the TFSI- anion was incorporated into the polymer as the dopant ion. Thickness of the film was measured by SEM and film conductivity was determined by both a four-point probe technique and by conducting atomic force microscopy. Electrochemical activity of the film was assessed by cyclic voltammetry. Results from these preliminary studies will be reported. DOI : 10.1007/s11998-008-9084-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9084-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2976 [article]

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Water sorption and diffusional properties of a cured epoxy resin measured using alternating ionic liquids/aqueous electrolytes in electrochemical impedance spectroscopy / Brian R. Hinderliter in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 5, N° 4 (12/2008)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 5, N° 4 (12/2008) . - p. 431-438 Titre : Water sorption and diffusional properties of a cured epoxy resin measured using alternating ionic liquids/aqueous electrolytes in electrochemical impedance spectroscopy Type de document : texte imprimé Auteurs : Brian R. Hinderliter, Auteur ; Stuart G. Croll, Auteur ; Dennis E. Tallman, Auteur ; Gordon P. Bierwagen, Auteur ; Kerry N. Allahar, Auteur Année de publication : 2008 Article en page(s) : p. 431-438 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Diffusion (physique) Electrochimie Electrolytes Epoxydes Liquides ioniques Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : The protective quality of a coating is often measured by how long it delays the arrival of water to the substrate. The transport of water in, redistribution within, and eventually through a coating to the substrate has long been investigated through electrochemical impedance spectroscopy (EIS). EIS measurements employing alternating nonaqueous (room temperature ionic liquids, RTIL) and aqueous electrolytes elucidated the behavior of water within the coating. Diffusion coefficients could be measured and the redistribution of water into percolating paths identified. The use of RTIL alternating with aqueous electrolytes allows determination of intrinsic properties (water volume fraction at saturation and relative dielectric) and kinetic properties predicted by the Brasher Kingsbury formulation. This article focuses on the sensitivity of these intrinsic and kinetic properties to test duration in an unique experimental method. DOI : 10.1007/s11998-008-9107-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9107-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3468 [article]

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