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Artículo

Dynamics and spatial distribution of water in Nafion 117 membrane investigated by NMR spin-spin relaxation

Andrada, Heber EduardoIcon ; Franzoni, Maria BelenIcon ; Carreras, Alejo CristianIcon ; Vaca Chávez Fornasero, FabiánIcon
Fecha de publicación: 05/2018
Editorial: Pergamon-Elsevier Science Ltd
Revista: International Journal of Hydrogen Energy
ISSN: 0360-3199
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Otras Ciencias Físicas

Resumen

The dynamics and spatial distribution of water molecules in Nafion 117 membrane has been investigated by 1 H NMR. To this end, 1D and 2D spin-spin (T 2 ) relaxometry experiments were carried out as a function of the relative humidity ranging from 9 to 100%. The inverse Laplace transform was successfully applied to obtain the 1D T 2 distributions and 2D relaxation maps. The 1D T 2 distributions show two peaks at low RH and mainly one at high water content, which can be associated with the rearrangement of the exchange sites inside the polymeric channels with the amount of water. From the T 2 distribution at 70% RH three types of water were identified corresponding to different degree of molecular mobility. The 2D T 2 -T 2 maps show molecular exchange between the two water populations found at low RH, while at 70% the exchange between only the two more mobile water populations takes place.
Palabras clave: NAFION MEMBRANES , NMR , SPIN–SPIN RELAXATION , WATER DYNAMICS
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/91577
URL: https://www.sciencedirect.com/science/article/pii/S0360319918309145
DOI: https://doi.org/10.1016/j.ijhydene.2018.03.124
Colecciones
Articulos(IFEG)
Articulos de INST.DE FISICA ENRIQUE GAVIOLA
Citación
Andrada, Heber Eduardo; Franzoni, Maria Belen; Carreras, Alejo Cristian; Vaca Chávez Fornasero, Fabián; Dynamics and spatial distribution of water in Nafion 117 membrane investigated by NMR spin-spin relaxation; Pergamon-Elsevier Science Ltd; International Journal of Hydrogen Energy; 43; 18; 5-2018; 8936-8943
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