Nanostructure of Nafion® membranes at different states of hydration

Grüger, A.; Régis, A.; Schmatko, Tatiana; Colomban, Philippe

doi:10.1016/s0924-2031(01)00116-3

Cited by 365 publications

(472 citation statements)

References 40 publications

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“…4.1). In this figure we can see the characteristic peaks of the bonds present at both the polymer backbone and the charged groups of the Nafion membrane, which are tabulated in the literature [1]. For example, the twist and in plane bending vibration of the CF 2 bonds are associated to the peaks observed at 292 and 385 cm -1 , whereas the peak observed at 731 cm -1 is assigned to the symmetric stretching vibration of these groups.…”

Section: Characterization Of the Membrane Structurementioning

confidence: 88%

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Determination of transport properties of Ni(II) through a Nafion cation-exchange membrane in chromic acid solutions

Martí-Calatayud

García-Gabaldón

Pérez-Herranz

et al. 2011

Journal of Membrane Science

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Acknowledgements / Agradecimientos / AgraïmentsEn primer lugar quisiera agradecer a Valentín y a Montse por haberme dado la oportunidad de investigar con ellos, por introducirme en un mundo que me ha fascinado, por haberme dirigido, por haberme ayudado en momentos de desasosiego; porque, en definitiva, creo que hemos formado un gran equipo.Quisiera agradecer a la Universitat Politècnica de València la financiación recibida para realizar la tesis. En general, he de agradecer al sistema de educación pública que ha permitido que un hijo de trabajadores como yo haya podido llegar hasta aquí. Además, quiero aprovechar para exigir un sistema de educación público, de calidad, e igualitario, que forme a personas con espíritu crítico y libre; puesto que sólo así se conseguirá que progresemos como sociedad.I would also like to thank to all the people from the group of Chemical Process Engineering of the RWTH Aachen University, especially to Matthias Wessling and Said Abdu, for accepting me in their research group. They have been very kind to me and I have learnt a lot from them and from this fruitful and unforgettable experience in Aachen.También quisiera agradecer a Daniella Buzzi por haberme dejado ser su "chefinho", por tantos momentos buenos y algún que otro momento crítico vividos juntos, porque es bonito saber que tengo una gran amiga al otro lado del charco.Gracias al Grupo IEC, en especial a mis compañeros, con los que he pasado más momentos juntos. Ellos han sido mi familia investigadora. Gracias a Isaac y Carlos, porque han sido para mí un referente, a Jordi y Ramón, porque han estado desde el principio, han sido como mis hermanos, y a Vir y Tepe, ellas han contribuido a que haya un ambiente de trabajo inmejorable! Quiero también dar las gracias al resto de componentes del grupo por su ayuda, en especial a Emma Ortega, a José Luis Guiñón por su ayuda con los equilibrios, y a Anna Igual porque con su energía consigue contagiar su pasión por la investigación.El fruto del trabajo de todos estos años tampoco sería posible sin los momentos vividos junto a mis amigos, el "Kanchy". Ellos son "los de toda la vida", los que siempre han estado, están y estarán ahí. Quisiera hacer mención especial a Lidia por su ayuda con la Tesis, y cómo no, a Sergio, porque juntos hemos arreglado el mundo un millón de veces… ¡para volverlo a destrozar otras tantas! No quiero olvidarme de ninguna de las personas con las que he coincidido y he pasado buenos momentos tanto en Valencia, como en Berlín o en Aachen… Maite, Laura, Guillaume… es imposible nombrarlos a todos… pero quiero agradecer en especial a Tania, porque con ella no existe el tiempo ni la distancia, sé que siempre está ahí a mi lado.Ha arribat el moment d'agrair a les quimixiques els grans moments viscuts. Amb elles hem format una gran família. Em sent molt afortunat d'haver caigut en un grup tan de "puça mare": gràcies a les Silvies, Elena, Gabriel·la, Angeleta, Rosa de Xeraco, Alicia, i en especial a Susana, la meua companya de batalles, i a Ingrid, una gran amiga.Per últim...

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Section: Characterization Of the Membrane Structurementioning

confidence: 88%

“…3.1. The high conductivity of Nafion has been attributed to the conformation of the membrane in wet conditions [1,2]. When the membrane is hydrated, it swells and the fixed sulfonate groups form ionic aggregates, which are called ionic clusters.…”

Section: Ion-exchange Membranes Used In the Thesismentioning

confidence: 99%

Determination of transport properties of Ni(II) through a Nafion cation-exchange membrane in chromic acid solutions

Martí-Calatayud

García-Gabaldón

Pérez-Herranz

et al. 2011

Journal of Membrane Science

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“…This is in accordance with the IR experimental observations. 53,56 In addition to the simulation cell with 4568 atoms described above, we prepared independent simulation cells that are 8 times larger to determine how the finite size influences the nanostructure. However, the dynamic properties (e.g., diffusion) reported here are based on the smaller system.…”

Section: Dr )mentioning

confidence: 99%

Nanophase-Segregation and Transport in Nafion 117 from Molecular Dynamics Simulations: Effect of Monomeric Sequence

et al. 2004

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Nafion polyelectrolyte is widely used in polymer electrolyte membrane fuel cells (PEMFC) due to its high proton conductivity. The properties of hydrated Nafion are attributed to its nanophase-segregated structure in which hydrophilic clusters are embedded in a hydrophobic matrix. However, there has been little characterization of how the monomeric sequence of the Nafion chain affects the nanophase-segregation structure and transport in hydrated Nafion. To study such properties, we carried out molecular dynamics (MD) simulations of Nafion 117 using two extreme monomeric sequences: one very blocky and other very dispersed. Both produce a nanophase-segregated structure with hydrophilic and hydrophobic domains. However, the blocky Nafion leads to a characteristic dimension of phase-segregation that is ∼60% larger than for the dispersed system. We find that the water-polymer interface is heterogeneous, consisting of hydrophilic patches (water contacting sulfonate groups of Nafion) and hydrophobic patches (water contacting fluorocarbon group). The distribution of the hydrophilic and the hydrophobic patches at the interface (i.e., the heterogeneity of interface) is much more segregated for blocky Nafion. This leads to a water diffusion coefficient for the dispersed case that is ∼25% smaller than for the blocky case (0.46 × 10 -5 vs 0.59 × 10 -5 cm 2 /s at 300 K). The experimental value (0.50 × 10 -5 cm 2 /s) is within the calculated range. On the other hand, we find that the vehicular diffusion of hydronium is not affected significantly by the monomeric sequence. These results should be useful in optimizing the properties of Nafion and as targets for developing other membranes to replace Nafion in PEMFC and other applications.

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“…These water-filled hydrophilic domains are separated from the hydrophobic polymer matrix resulting in a two-phase nanostructure as observed through a vast number of scattering experiments [9,[20][21][22][23][24][25][34][35][36][37]. Upon water uptake, 3 water molecules initially ionize the SO 3 groups and remain bound to them.…”

mentioning

confidence: 99%

“…This relationship is referred to as non-affine deformation and has been shown to occur for PFSA membranes by a number of studies in literature [11,[18][19][20][21][22]29,[33][34][35]. Despite the growing body of literature on the sorption behavior [7,8,10,24,34,35,38,40,[44][45][46][47][48][49][50] and nano-structural modeling and characterization [11,13,[17][18][19][20][21][22]28,29,31,[33][34][35][36]39,49,51,52] of PFSA ionomers, the relationship between the water uptake and nanostructure, temperature, mechanical properties and membrane pretreatment is not well established. Understanding of these issues requires a general, yet fundamental model, which is the subject of this study.…”

mentioning

confidence: 99%

Mechanics-based model for non-affine swelling in perfluorosulfonic acid (PFSA) membranes

Kusoglu

Santare

Karlsson

2009

Polymer

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Nanostructure of Nafion® membranes at different states of hydration

Cited by 365 publications

References 40 publications

Determination of transport properties of Ni(II) through a Nafion cation-exchange membrane in chromic acid solutions

Determination of transport properties of Ni(II) through a Nafion cation-exchange membrane in chromic acid solutions

Nanophase-Segregation and Transport in Nafion 117 from Molecular Dynamics Simulations: Effect of Monomeric Sequence

Mechanics-based model for non-affine swelling in perfluorosulfonic acid (PFSA) membranes

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