Documents disponibles écrits par cet auteur

A conjugated polymer network approach to anticorrosion coatings / Antonio F. Frau in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9789–9797 Titre : A conjugated polymer network approach to anticorrosion coatings : Poly (vinylcarbazole) electrodeposition Type de document : texte imprimé Auteurs : Antonio F. Frau, Auteur ; Roderick B. Pernites, Auteur ; Rigoberto C. Advincula, Auteur Année de publication : 2011 Article en page(s) : pp. 9789–9797 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Polymer  Anticorrosion Résumé : The fabrication and characterization of poly(vinylcarbazole) (PVK)-conjugated polymer network (CPN) anticorrosion coatings on flat surfaces, steel coupons or indium tin oxide (ITO) glass substrates, is reported. Electrochemical deposition methods (potentiostatic and potentiodynamic) were employed by anodic oxidation of the carbazole side units in the PVK chains, resulting in electrodeposition of a cross-linked or network macromolecular structure. This is different from traditional conjugated polymer (CP) coatings made up of mostly linear species derived from direct electropolymerization of small molecule monomers. The coating composition was characterized by attenuated total reflection infrared spectroscopy (ATR-IR) and photoelectron spectroscopy (XPS). Atomic force microscopy (AFM) allowed morphological comparison between the coatings in terms of deposition technique and surface roughness. Electrochemical impedance spectroscopy (EIS) was subsequently carried out on PVK-coated steel coupons to evaluate the performance of such coatings in an accelerated corrosion environment. The deviation from the ideal (i.e., perfectly dielectric) capacitor-like behavior and Bode plot data suggested that the CPN approach of electrodeposited PVK coatings resulted in very good protection against weathering of engineering metals. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100813t [article] A conjugated polymer network approach to anticorrosion coatings : Poly (vinylcarbazole) electrodeposition [texte imprimé] / Antonio F. Frau, Auteur ; Roderick B. Pernites, Auteur ; Rigoberto C. Advincula, Auteur . - 2011 . - pp. 9789–9797. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9789–9797 Mots-clés : Polymer  Anticorrosion Résumé : The fabrication and characterization of poly(vinylcarbazole) (PVK)-conjugated polymer network (CPN) anticorrosion coatings on flat surfaces, steel coupons or indium tin oxide (ITO) glass substrates, is reported. Electrochemical deposition methods (potentiostatic and potentiodynamic) were employed by anodic oxidation of the carbazole side units in the PVK chains, resulting in electrodeposition of a cross-linked or network macromolecular structure. This is different from traditional conjugated polymer (CP) coatings made up of mostly linear species derived from direct electropolymerization of small molecule monomers. The coating composition was characterized by attenuated total reflection infrared spectroscopy (ATR-IR) and photoelectron spectroscopy (XPS). Atomic force microscopy (AFM) allowed morphological comparison between the coatings in terms of deposition technique and surface roughness. Electrochemical impedance spectroscopy (EIS) was subsequently carried out on PVK-coated steel coupons to evaluate the performance of such coatings in an accelerated corrosion environment. The deviation from the ideal (i.e., perfectly dielectric) capacitor-like behavior and Bode plot data suggested that the CPN approach of electrodeposited PVK coatings resulted in very good protection against weathering of engineering metals. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100813t

Modulating electrochemical activity in polyaniline/titanium oxide hybrid nanostructured ultrathin films / Antonio F. Frau in Industrial & engineering chemistry research, Vol. 50 N° 9 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5532–5542 Titre : Modulating electrochemical activity in polyaniline/titanium oxide hybrid nanostructured ultrathin films Type de document : texte imprimé Auteurs : Antonio F. Frau, Auteur ; Thomas J. Lane, Auteur ; Andrea E. Schlather, Auteur Année de publication : 2011 Article en page(s) : pp. 5532–5542 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Electrochemical  Titanium  oxide Résumé : Hybrid and nanostructured ultrathin films of polyaniline (PANI) were fabricated using combined layer-by-layer (LbL) and surface sol−gel (SSG) processing with titanium oxide (TiOx) layers. This enabled modulation of the electrochemical and the doping−dedoping process of the electroactive conjugated polymer with respect to thickness, presence of another polyelectrolyte, and intercalation of the inorganic slabs. The structure, composition, and viscoelastic behavior were proven by UV−vis absorbance, FT-IR, XPS, and QCM-D measurements. Spectroelectrochemical behavior showed that the oxidative stability of the films brought about the nanostructure control of the LbL process. On the other hand, the presence of the inorganic layer resulted in preventing electron transfer based on quinoid to benzenoid, Q → B, transitions. Thus, pairing the LbL assembly and the SSG process yielded a highly ordered, tunable structure in which the electrochemical behavior was modulated and correlated with diffusion-related arguments (Cottrell equation) of a blocking effect of the sol−gel layer. Further studies will be made on evaluating possible applications in thin film battery and capacitor devices. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101805a [article] Modulating electrochemical activity in polyaniline/titanium oxide hybrid nanostructured ultrathin films [texte imprimé] / Antonio F. Frau, Auteur ; Thomas J. Lane, Auteur ; Andrea E. Schlather, Auteur . - 2011 . - pp. 5532–5542. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5532–5542 Mots-clés : Electrochemical  Titanium  oxide Résumé : Hybrid and nanostructured ultrathin films of polyaniline (PANI) were fabricated using combined layer-by-layer (LbL) and surface sol−gel (SSG) processing with titanium oxide (TiOx) layers. This enabled modulation of the electrochemical and the doping−dedoping process of the electroactive conjugated polymer with respect to thickness, presence of another polyelectrolyte, and intercalation of the inorganic slabs. The structure, composition, and viscoelastic behavior were proven by UV−vis absorbance, FT-IR, XPS, and QCM-D measurements. Spectroelectrochemical behavior showed that the oxidative stability of the films brought about the nanostructure control of the LbL process. On the other hand, the presence of the inorganic layer resulted in preventing electron transfer based on quinoid to benzenoid, Q → B, transitions. Thus, pairing the LbL assembly and the SSG process yielded a highly ordered, tunable structure in which the electrochemical behavior was modulated and correlated with diffusion-related arguments (Cottrell equation) of a blocking effect of the sol−gel layer. Further studies will be made on evaluating possible applications in thin film battery and capacitor devices. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101805a