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Abstract:

The quasi-equilibrium electrochemomechanical behavior of relatively thick polyaniline films in sulfuric acid is investigated through experimental measurements and theoretical modeling. The leucoemeraldine (LE)-emeraldine (EM) conversion, or redox switching, is studied. The dependence of film volume and electrochemical charge is determined as a function of applied potential. It is observed that the film volume follows the charge, showing an expansion during the second half of the LE-EM oxidation. The model postulates the existence of a stable intermediate, protoemeraldine (PE), with a formal potential distribution for the PE-EM reaction. The volume change is modeled statistically considering contributions from mixing, polymer deformation, and electrostatic charge. The model shows very good agreement with the experiments, indicating that, in the conditions studied, the deformation contribution dominates the volume changes as a result of the conformational modifications undergone by the polymer in the PE-EM oxidation. © 2005 American Chemical Society.

Registro:

Documento: Artículo
Título:Quasi-equilibrium volume changes of polyaniline films upon redox switching. formal potential distribution and configurational modeling
Autor:Lizarraga, L.; Andrade, E.M.; Florit, M.I.; Molina, F.V.
Filiación:Institute de Química Física de Los Materieles, Facultad de Ciencias Exactas y Naturales, Pabellon II, C1428EHA Buenos Aires, Argentina
Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de la Plata, La Plata, Argentina
Palabras clave:Aromatic polymers; Electrostatics; Nitrogen compounds; Polymers; Redox reactions; Statistical methods; Sulfuric acid; Electromechanical behavior; Polyanilines; Polymer deformation; Redox switching; Plastic films; aniline derivative; polyaniline; polymer; sulfuric acid; article; artificial membrane; chemical model; chemical structure; chemistry; electrochemistry; oxidation reduction reaction; Aniline Compounds; Electrochemistry; Membranes, Artificial; Models, Chemical; Molecular Structure; Oxidation-Reduction; Polymers; Sulfuric Acids
Año:2005
Volumen:109
Número:40
Página de inicio:18815
Página de fin:18821
DOI: http://dx.doi.org/10.1021/jp054052s
Título revista:Journal of Physical Chemistry B
Título revista abreviado:J Phys Chem B
ISSN:15206106
CODEN:JPCBF
CAS:polyaniline, 25233-30-1; sulfuric acid, 7664-93-9; Aniline Compounds; Membranes, Artificial; polyaniline; Polymers; sulfuric acid, 7664-93-9; Sulfuric Acids
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15206106_v109_n40_p18815_Lizarraga

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Citas:

---------- APA ----------
Lizarraga, L., Andrade, E.M., Florit, M.I. & Molina, F.V. (2005) . Quasi-equilibrium volume changes of polyaniline films upon redox switching. formal potential distribution and configurational modeling. Journal of Physical Chemistry B, 109(40), 18815-18821.
http://dx.doi.org/10.1021/jp054052s
---------- CHICAGO ----------
Lizarraga, L., Andrade, E.M., Florit, M.I., Molina, F.V. "Quasi-equilibrium volume changes of polyaniline films upon redox switching. formal potential distribution and configurational modeling" . Journal of Physical Chemistry B 109, no. 40 (2005) : 18815-18821.
http://dx.doi.org/10.1021/jp054052s
---------- MLA ----------
Lizarraga, L., Andrade, E.M., Florit, M.I., Molina, F.V. "Quasi-equilibrium volume changes of polyaniline films upon redox switching. formal potential distribution and configurational modeling" . Journal of Physical Chemistry B, vol. 109, no. 40, 2005, pp. 18815-18821.
http://dx.doi.org/10.1021/jp054052s
---------- VANCOUVER ----------
Lizarraga, L., Andrade, E.M., Florit, M.I., Molina, F.V. Quasi-equilibrium volume changes of polyaniline films upon redox switching. formal potential distribution and configurational modeling. J Phys Chem B. 2005;109(40):18815-18821.
http://dx.doi.org/10.1021/jp054052s