(Fig. 10), and the adsorption diffusion coefficient determined is 8.65 ± .05 1010 m2/s. However, if potassium hydroxide was used as a catalyst, the average pore size was relatively large (less dense structure) and the adsorption diffusion coefficient was smaller (0.91 ± 0.03 1010 m2/s) compared to the sample prepared using hydrofluoric acid. Similar trends can be observed for desorption diffusion coefficients.