Water Diffusivity in Nation

Diffusion coefficient of water in Nafion-117 is measured experimentally by Zawodzinski et al. (1991) (Springer et al., 1991) and the empirical correlation is given as 

The exponential term include the variation of diffusion coefficient with temperature beyond 30°C or 303 K. 

Motupally et al. (2000) proposed correlation diffusion coefficient of water in Nafion-115 as 

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Yeager, H.L., Steck, A. 1981. Cation and water diffusion in Nation ion exchange membranes influence of polymer structure. Journal of the Electrochemical Society, 128,1880-1884. 

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