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| - Dynamics of H2O and Na+ in Nafion Membranes
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| - We investigate the transport properties of a model of a hydrated Na-Nafion membrane using molecular dynamicssimulations. The system consists of several Nafion chains forming a pore with the water and ions inside. Atlow water content, the hydrophilic domain is not continuous and diffusion is very slow. The diffusion coefficientof both water and Na+ increases with increasing hydration (more strongly so for Na+). The simulations arein qualitative agreement with experimental results for similar systems. The diffusion coefficient is an averageover the motion of ions or water molecules located in different environments. To better understand the roleof the environment, we calculate the distribution of the residence times of the ion (or water) at differentlocations in the system. We discuss the transport mechanism in light of this information.
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