Handle URI:
http://hdl.handle.net/10754/598931
Title:
Nafion–clay hybrids with a network structure
Authors:
Burgaz, Engin; Lian, Huiqin; Alonso, Rafael Herrera; Estevez, Luis; Kelarakis, Antonios; Giannelis, Emmanuel P.
Abstract:
Nafion-clay hybrid membranes with a unique microstructure were synthesized using a fundamentally new approach. The new approach is based on depletion aggregation of suspended particles - a well-known phenomenon in colloids. For certain concentrations of clay and polymer, addition of Nafion solution to clay suspensions in water leads to a gel. Using Cryo-TEM we show that the clay particles in the hybrid gels form a network structure with an average cell size in the order of 500 nm. The hybrid gels are subsequently cast to produce hybrid Nafion-clay membranes. Compared to pure Nafion the swelling of the hybrid membranes in water and methanol is dramatically reduced while their selectivity (ratio of conductivity over permeability) increases. The small decrease of ionic conductivity for the hybrid membranes is more than compensated by the large decrease in methanol permeability. Lastly the hybrid membranes are much stiffer and can withstand higher temperatures compared to pure Nafion. Both of these characteristics are highly desirable for use in fuel cell applications, since a) they will allow the use of a thinner membrane circumventing problems associated with the membrane resistance and b) enable high temperature applications. © 2009 Elsevier Ltd. All rights reserved.
Citation:
Burgaz E, Lian H, Alonso RH, Estevez L, Kelarakis A, et al. (2009) Nafion–clay hybrids with a network structure. Polymer 50: 2384–2392. Available: http://dx.doi.org/10.1016/j.polymer.2009.03.042.
Publisher:
Elsevier BV
Journal:
Polymer
KAUST Grant Number:
KUS-C1-018-02
Issue Date:
May-2009
DOI:
10.1016/j.polymer.2009.03.042
Type:
Article
ISSN:
0032-3861
Sponsors:
EPG acknowledges the support of Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST).
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorBurgaz, Enginen
dc.contributor.authorLian, Huiqinen
dc.contributor.authorAlonso, Rafael Herreraen
dc.contributor.authorEstevez, Luisen
dc.contributor.authorKelarakis, Antoniosen
dc.contributor.authorGiannelis, Emmanuel P.en
dc.date.accessioned2016-02-25T13:43:57Zen
dc.date.available2016-02-25T13:43:57Zen
dc.date.issued2009-05en
dc.identifier.citationBurgaz E, Lian H, Alonso RH, Estevez L, Kelarakis A, et al. (2009) Nafion–clay hybrids with a network structure. Polymer 50: 2384–2392. Available: http://dx.doi.org/10.1016/j.polymer.2009.03.042.en
dc.identifier.issn0032-3861en
dc.identifier.doi10.1016/j.polymer.2009.03.042en
dc.identifier.urihttp://hdl.handle.net/10754/598931en
dc.description.abstractNafion-clay hybrid membranes with a unique microstructure were synthesized using a fundamentally new approach. The new approach is based on depletion aggregation of suspended particles - a well-known phenomenon in colloids. For certain concentrations of clay and polymer, addition of Nafion solution to clay suspensions in water leads to a gel. Using Cryo-TEM we show that the clay particles in the hybrid gels form a network structure with an average cell size in the order of 500 nm. The hybrid gels are subsequently cast to produce hybrid Nafion-clay membranes. Compared to pure Nafion the swelling of the hybrid membranes in water and methanol is dramatically reduced while their selectivity (ratio of conductivity over permeability) increases. The small decrease of ionic conductivity for the hybrid membranes is more than compensated by the large decrease in methanol permeability. Lastly the hybrid membranes are much stiffer and can withstand higher temperatures compared to pure Nafion. Both of these characteristics are highly desirable for use in fuel cell applications, since a) they will allow the use of a thinner membrane circumventing problems associated with the membrane resistance and b) enable high temperature applications. © 2009 Elsevier Ltd. All rights reserved.en
dc.description.sponsorshipEPG acknowledges the support of Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST).en
dc.publisherElsevier BVen
dc.subjectDepletion-induced interactionen
dc.subjectIonomeren
dc.subjectNafionen
dc.titleNafion–clay hybrids with a network structureen
dc.typeArticleen
dc.identifier.journalPolymeren
dc.contributor.institutionCornell University, Ithaca, United Statesen
dc.contributor.institutionYanbian University, Yanji, Chinaen
kaust.grant.numberKUS-C1-018-02en
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