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    Nafion–clay hybrids with a network structure

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    Type
    Article
    Authors
    Burgaz, Engin
    Lian, Huiqin
    Alonso, Rafael Herrera
    Estevez, Luis
    Kelarakis, Antonios
    Giannelis, Emmanuel P.
    KAUST Grant Number
    KUS-C1-018-02
    Date
    2009-05
    Permanent link to this record
    http://hdl.handle.net/10754/598931
    
    Metadata
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    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.
    Sponsors
    EPG acknowledges the support of Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST).
    Publisher
    Elsevier BV
    Journal
    Polymer
    DOI
    10.1016/j.polymer.2009.03.042
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.polymer.2009.03.042
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