Effect of Water on the Size Distribution of Free-Volume Holes in Nafion Membrane

Jakub Čížek; Zuzana Barnovská; Michal Šourek; Ivan Procházka

doi:10.4028/www.scientific.net/MSF.733.49

Paper Titles

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The Free Volume Dynamics
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Study of Unbound HePs Using Exact Diagonalization Technique
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Layer Structures of Composite Membranes for Water Filtration Elucidated by Variable-Energy Positron Annihilation
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Effect of Water on the Size Distribution of Free-Volume Holes in Nafion Membrane
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Annihilation Process of Positron in Degraded Nafion^®-117
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Study of Thin Nafion^® Films for Fuel Cells Using Energy Variable Slow Positron Annihilation Spectroscopy
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Positronium Lifetimes and Gas Permeation in Aquivion® for Fuel Cells
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Positronium in Normal Alkanes
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HomeMaterials Science ForumMaterials Science Forum Vol. 733Effect of Water on the Size Distribution of...

Effect of Water on the Size Distribution of Free-Volume Holes in Nafion Membrane

Abstract:

Positron lifetime spectroscopy was employed for investigation of the size distribution of free volume holes in Nafion N-1110 membrane. Size distribution of free volume holes was determined in the as-received and dried membrane and in the membrane immersed in water at various temperatures. It was found that absorbed water causes reduction of the mean size of free volume holes and increase of their dispersion and concentration. This indicates that free volumes are split by swollen ionic clusters absorbing water. The kinetics of water uptake and the amount of absorbed solvent was determined by in-situ measurement of the weight increase.