Hydration cycling in redox active LBL self-assembled polyelectrolyte multilayers
Direct evidence of a net gain or loss of water by redox switching self-assembled redox active polyelectrolyte multilayers from/to the liquid electrolyte has been obtained by "in situ" infrared spectroscopy. This is in agreement with EQCM microgravimetry and ellipsometry thickness change up...
Guardado en:
Autores principales: | , , |
---|---|
Publicado: |
2006
|
Materias: | |
Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13882481_v8_n8_p1353_Grumelli http://hdl.handle.net/20.500.12110/paper_13882481_v8_n8_p1353_Grumelli |
Aporte de: |
id |
paper:paper_13882481_v8_n8_p1353_Grumelli |
---|---|
record_format |
dspace |
spelling |
paper:paper_13882481_v8_n8_p1353_Grumelli2023-06-08T16:13:05Z Hydration cycling in redox active LBL self-assembled polyelectrolyte multilayers Grumelli, Doris E. Bonazzola, Cecilia Calvo, Ernesto Julio FTIR LBL Osmium bipyridil PEMs Self-assembly SNIFTIRS Solvent exchange Hydration Multilayers Polystyrenes Positive ions Redox reactions Self assembly Osmium bipyridil SNIFTIRS Solvent exchange Polyelectrolytes Direct evidence of a net gain or loss of water by redox switching self-assembled redox active polyelectrolyte multilayers from/to the liquid electrolyte has been obtained by "in situ" infrared spectroscopy. This is in agreement with EQCM microgravimetry and ellipsometry thickness change upon oxidation-reduction cycles due to the exchange of ions and solvent, which results in film swelling. Infrared evidence of a change in the environment of functional groups, i.e., SO3-, NH3+ and bipyridines in the films formed by poly(allylamine) modified covalently by an osmium bipyridine-pyridine complex (PAH-Os) and polystyrene sulfonate (PSS) has also been obtained by SNIFTIRS. This has been interpreted as break of the polycation-polyanion chain electrostatic interaction by mobile cations and anions from the solution forming ion pairs with the polyelectrolyte chains in the film during "break in". © 2006 Elsevier B.V. All rights reserved. Fil:Grumelli, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bonazzola, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Calvo, E.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2006 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13882481_v8_n8_p1353_Grumelli http://hdl.handle.net/20.500.12110/paper_13882481_v8_n8_p1353_Grumelli |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
FTIR LBL Osmium bipyridil PEMs Self-assembly SNIFTIRS Solvent exchange Hydration Multilayers Polystyrenes Positive ions Redox reactions Self assembly Osmium bipyridil SNIFTIRS Solvent exchange Polyelectrolytes |
spellingShingle |
FTIR LBL Osmium bipyridil PEMs Self-assembly SNIFTIRS Solvent exchange Hydration Multilayers Polystyrenes Positive ions Redox reactions Self assembly Osmium bipyridil SNIFTIRS Solvent exchange Polyelectrolytes Grumelli, Doris E. Bonazzola, Cecilia Calvo, Ernesto Julio Hydration cycling in redox active LBL self-assembled polyelectrolyte multilayers |
topic_facet |
FTIR LBL Osmium bipyridil PEMs Self-assembly SNIFTIRS Solvent exchange Hydration Multilayers Polystyrenes Positive ions Redox reactions Self assembly Osmium bipyridil SNIFTIRS Solvent exchange Polyelectrolytes |
description |
Direct evidence of a net gain or loss of water by redox switching self-assembled redox active polyelectrolyte multilayers from/to the liquid electrolyte has been obtained by "in situ" infrared spectroscopy. This is in agreement with EQCM microgravimetry and ellipsometry thickness change upon oxidation-reduction cycles due to the exchange of ions and solvent, which results in film swelling. Infrared evidence of a change in the environment of functional groups, i.e., SO3-, NH3+ and bipyridines in the films formed by poly(allylamine) modified covalently by an osmium bipyridine-pyridine complex (PAH-Os) and polystyrene sulfonate (PSS) has also been obtained by SNIFTIRS. This has been interpreted as break of the polycation-polyanion chain electrostatic interaction by mobile cations and anions from the solution forming ion pairs with the polyelectrolyte chains in the film during "break in". © 2006 Elsevier B.V. All rights reserved. |
author |
Grumelli, Doris E. Bonazzola, Cecilia Calvo, Ernesto Julio |
author_facet |
Grumelli, Doris E. Bonazzola, Cecilia Calvo, Ernesto Julio |
author_sort |
Grumelli, Doris E. |
title |
Hydration cycling in redox active LBL self-assembled polyelectrolyte multilayers |
title_short |
Hydration cycling in redox active LBL self-assembled polyelectrolyte multilayers |
title_full |
Hydration cycling in redox active LBL self-assembled polyelectrolyte multilayers |
title_fullStr |
Hydration cycling in redox active LBL self-assembled polyelectrolyte multilayers |
title_full_unstemmed |
Hydration cycling in redox active LBL self-assembled polyelectrolyte multilayers |
title_sort |
hydration cycling in redox active lbl self-assembled polyelectrolyte multilayers |
publishDate |
2006 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13882481_v8_n8_p1353_Grumelli http://hdl.handle.net/20.500.12110/paper_13882481_v8_n8_p1353_Grumelli |
work_keys_str_mv |
AT grumellidorise hydrationcyclinginredoxactivelblselfassembledpolyelectrolytemultilayers AT bonazzolacecilia hydrationcyclinginredoxactivelblselfassembledpolyelectrolytemultilayers AT calvoernestojulio hydrationcyclinginredoxactivelblselfassembledpolyelectrolytemultilayers |
_version_ |
1768543436461309952 |