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A SANS determination of the influence of external conditions on the nanostructure of nafion membrane

✍ Scribed by Anne-Laure Rollet; Gérard Gebel; Jean-Pierre Simonin; Pierre Turq

Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
200 KB
Volume
39
Category
Article
ISSN
0887-6266

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✦ Synopsis

We have studied the structure of nafion membranes by small-angle neutron scattering in the q range of 7 10 Ϫ3 Å Ϫ1 to 0.4 Å Ϫ1 . External conditions were varied: counterions, electrolyte concentration, temperature, and pretreatment of membranes. The nanostructure of Nafion exhibits a sensivity that depends on the parameters considered: changing counterions and concentration leads to a reversible local reorganization of the hydrophilic cavities, whereas changing temperature and pretreament leads to a irreversible reoganization on a larger scale. The mean variation of the radius of the hydrophilic cavities versus these parameters is about 10%. The interface between hydrophobic and hydrophilic phases appears to be sharp except when the temperature exceeds 60 °C.

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