Perfluorinated surfactants as model charged systems for understanding the effect of confinement on proton transport and water mobility in fuel ... View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2010-10

AUTHORS

S. Lyonnard, Q. Berrod, B.-A. Brüning, G. Gebel, A. Guillermo, H. Ftouni, J. Ollivier, B. Frick

ABSTRACT

. We have investigated the dynamical properties of water confined in mesomorphous phases of perfluorinated sulfonic surfactants. These systems mimic the physico-chemical properties of the perfluorinated Nafion membranes which are used as electrolyte in fuel cells. As the surfactants offer the advantage to self-assemble in well defined organized phases (such as hexagonal and lamellar phases), they could be used as model charged systems to understand the structure-transport relationship in complex real materials. Indeed, the geometry as well as the typical confinement size can be easily controlled and tuned through water concentration and temperature. A QENS study of hexagonal and lamellar phases has been performed on both time-of-flight and backscattering spectrometers to cover a dynamic range from picoseconds to nanoseconds. Analysis of the data with localized translational diffusion models shows the existence of a strong confinement effect that depends on the geometry. Typical confinement sizes and diffusion coefficients can be extracted from the QENS analysis and compared to the Nafion membrane. More... »

PAGES

205-216

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1140/epjst/e2010-01324-x

DOI

http://dx.doi.org/10.1140/epjst/e2010-01324-x

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1047518381


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