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: | , , |
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2006
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| 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: |
| Sumario: | 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. |
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