Quasi-equilibrium volume changes of polyaniline films upon redox switching. formal potential distribution and configurational modeling
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...
Guardado en:
| Autores principales: | , , , |
|---|---|
| Formato: | JOUR |
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_15206106_v109_n40_p18815_Lizarraga |
| Aporte de: |
| id |
todo:paper_15206106_v109_n40_p18815_Lizarraga |
|---|---|
| record_format |
dspace |
| spelling |
todo:paper_15206106_v109_n40_p18815_Lizarraga2023-10-03T16:20:08Z Quasi-equilibrium volume changes of polyaniline films upon redox switching. formal potential distribution and configurational modeling Lizarraga, L. Andrade, E.M. Florit, M.I. Molina, F.V. 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 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. Fil:Lizarraga, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Andrade, E.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Molina, F.V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15206106_v109_n40_p18815_Lizarraga |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 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 |
| topic_facet |
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 |
| description |
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. |
| format |
JOUR |
| author |
Lizarraga, L. Andrade, E.M. Florit, M.I. Molina, F.V. |
| author_facet |
Lizarraga, L. Andrade, E.M. Florit, M.I. Molina, F.V. |
| author_sort |
Lizarraga, L. |
| title |
Quasi-equilibrium volume changes of polyaniline films upon redox switching. formal potential distribution and configurational modeling |
| title_short |
Quasi-equilibrium volume changes of polyaniline films upon redox switching. formal potential distribution and configurational modeling |
| title_full |
Quasi-equilibrium volume changes of polyaniline films upon redox switching. formal potential distribution and configurational modeling |
| title_fullStr |
Quasi-equilibrium volume changes of polyaniline films upon redox switching. formal potential distribution and configurational modeling |
| title_full_unstemmed |
Quasi-equilibrium volume changes of polyaniline films upon redox switching. formal potential distribution and configurational modeling |
| title_sort |
quasi-equilibrium volume changes of polyaniline films upon redox switching. formal potential distribution and configurational modeling |
| url |
http://hdl.handle.net/20.500.12110/paper_15206106_v109_n40_p18815_Lizarraga |
| work_keys_str_mv |
AT lizarragal quasiequilibriumvolumechangesofpolyanilinefilmsuponredoxswitchingformalpotentialdistributionandconfigurationalmodeling AT andradeem quasiequilibriumvolumechangesofpolyanilinefilmsuponredoxswitchingformalpotentialdistributionandconfigurationalmodeling AT floritmi quasiequilibriumvolumechangesofpolyanilinefilmsuponredoxswitchingformalpotentialdistributionandconfigurationalmodeling AT molinafv quasiequilibriumvolumechangesofpolyanilinefilmsuponredoxswitchingformalpotentialdistributionandconfigurationalmodeling |
| _version_ |
1807314910935252992 |