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...

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Autores principales: Grumelli, D., Bonazzola, C., Calvo, E.J.
Formato: JOUR
Materias:
FTIR
LBL
Osmium bipyridil
PEMs
Self-assembly
SNIFTIRS
Solvent exchange
Hydration
Multilayers
Polystyrenes
Positive ions
Redox reactions
Self assembly
Polyelectrolytes
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_13882481_v8_n8_p1353_Grumelli
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_13882481_v8_n8_p1353_Grumelli2023-10-03T16:12:39Z Hydration cycling in redox active LBL self-assembled polyelectrolyte multilayers Grumelli, D. Bonazzola, C. Calvo, E.J. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, D.
Bonazzola, C.
Calvo, E.J.
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.
format JOUR
author Grumelli, D.
Bonazzola, C.
Calvo, E.J.
author_facet Grumelli, D.
Bonazzola, C.
Calvo, E.J.
author_sort Grumelli, D.
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
url http://hdl.handle.net/20.500.12110/paper_13882481_v8_n8_p1353_Grumelli
work_keys_str_mv AT grumellid hydrationcyclinginredoxactivelblselfassembledpolyelectrolytemultilayers
AT bonazzolac hydrationcyclinginredoxactivelblselfassembledpolyelectrolytemultilayers
AT calvoej hydrationcyclinginredoxactivelblselfassembledpolyelectrolytemultilayers
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